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Chen Lin
最後のアクティビティ: 2024 年 12 月 20 日 14:41

Update to the Machine Translation Feature on MATLAB Answers

We’d like to announce a change on the Machine Translation feature on MATLAB Answers.

When users are visiting our international domains (e.g. China or Japan), Answers provides the option to translate the content. Recently, we identified several security threats involving high-volume requests from certain IP addresses targeting our translation service.

As one of the countermeasures, we have now placed the Machine Translation feature behind a login requirement. While non-logged-in users will still see the 'Translate' button, it will be inactive (greyed out) until they log in.

We are actively collaborating with adjacent teams to develop solutions to better detect and block malicious requests.

Please let us know if you have any questions or concerns.

Fernando Meo
最後のアクティビティ: 2024 年 12 月 19 日 13:48

Solution to slow execution of "uigetfile" function with an enormous number of files in a folder

If you have a folder with an enormous number of files and want to use the uigetfile function to select specific files, you may have noticed a significant delay in displaying the file list.

Thanks to the assistance from MathWorks support, an interesting behavior was observed.

For example, if a folder such as Z:\Folder1\Folder2\data contains approximately 2 million files, and you attempt to use uigetfile to access files with a specific extension (e.g., *.ext), the following behavior occurs:

Method 1: This takes minutes to show me the list of all files

[FileName, PathName] = uigetfile('Z:\Folder1\Folder2\data\*.ext',  'File selection');

Method 2: This takes less than a second to display all files.

[FileName, PathName] = uigetfile('*.ext', 'File selection','Z:\Folder1\Folder2\data');

Method 3: This method also takes minutes to display the file list. What is intertesting is that this method is the same as Method 2, except that a file seperator "\" is added at the end of the folder string.

[FileName, PathName] = uigetfile('*.ext', 'File selection','Z:\Folder1\Folder2\data\');

I was informed that the Mathworks development team has been informed of this strange behaviour.

I am using 2023a, but think this should be the same for newer versions.

Fernando Meo
最後のアクティビティ: 2024 年 12 月 18 日 16:27

Solution to slow execution of "uigetfile" function with an enormous number of files in a folder

This post is more of a "tips and tricks" guide than a question.

If you have a folder with an enormous number of files and want to use the uigetfile function to select specific files, you may have noticed a significant delay in displaying the file list.

Thanks to the assistance from MathWorks support, an interesting behavior was observed.

Method 1: This takes minutes to show me the list of all files

[FileName, PathName] = uigetfile('Z:\Folder1\Folder2\data\*.ext',  'File selection');

Method 2: This takes less than a second to display all files.

[FileName, PathName] = uigetfile('*.ext', 'File selection','Z:\Folder1\Folder2\data');

[FileName, PathName] = uigetfile('*.ext', 'File selection','Z:\Folder1\Folder2\data\');

I was informed that the Mathworks development team has been informed of this strange behaviour.

I am using 2023a, but think this should be the same for newer versions.

Zhaoxu Liu / slandarer
最後のアクティビティ: 2024 年 12 月 16 日 16:49

Christmas Tree for Matlaber : Rotating With Falling Snowflakes

Christmas is coming, here are two dynamic Christmas tree drawing codes:

Crystal XMas Tree

function XmasTree2024_1
fig = figure('Units','normalized', 'Position',[.1,.1,.5,.8],...
    'Color',[0,9,33]/255, 'UserData',40 + [60,65,75,72,0,59,64,57,74,0,63,59,57,0,1,6,45,75,61,74,28,57,76,57,1,1]);
axes('Parent',fig, 'Position',[0,-1/6,1,1+1/3], 'UserData',97 + [18,11,0,13,3,0,17,4,17],...
      'XLim',[-1.5,1.5], 'YLim',[-1.5,1.5], 'ZLim',[-.2,3.8], 'DataAspectRatio', [1,1,1], 'NextPlot','add',...
      'Projection','perspective', 'Color',[0,9,33]/255, 'XColor','none', 'YColor','none', 'ZColor','none')
%% Draw Christmas tree
F = [1,3,4;1,4,5;1,5,6;1,6,3;...
    2,3,4;2,4,5;2,5,6;2,6,3];
dP = @(V) patch('Faces',F, 'Vertices',V, 'FaceColor',[0 71 177]./255,...
    'FaceAlpha',rand(1).*0.2+0.1, 'EdgeColor',[0 71 177]./255.*0.8,...
    'EdgeAlpha',0.6, 'LineWidth',0.5, 'EdgeLighting','gouraud', 'SpecularStrength',0.3);
r = .1; h = .8; 
V0 = [0,0,0; 0,0,1; 0,r,h; r,0,h; 0,-r,h; -r,0,h];
% Rotation matrix
Rx = @(V, theta) V*[1 0 0; 0 cos(theta) sin(theta); 0 -sin(theta) cos(theta)];
Rz = @(V, theta) V*[cos(theta) sin(theta) 0;-sin(theta) cos(theta) 0; 0 0 1];
N = 180; Vn = zeros(N, 3); eval(char(fig.UserData))
for i = 1:N
    tV = Rz(Rx(V0.*(1.2 - .8.*i./N + rand(1).*.1./i^(1/5)), pi/3.*(1 - .6.*i./N)), i.*pi/8.1 + .001.*i.^2) + [0,0,.016.*i];
    dP(tV); Vn(i,:) = tV(2,:);
end
scatter3(Vn(:,1).*1.02,Vn(:,2).*1.02,Vn(:,3).*1.01, 30, 'w', 'Marker','*', 'MarkerEdgeAlpha',.5)
%% Draw Star of Bethlehem
w = .3; R = .62; r = .4; T = (1/8:1/8:(2 - 1/8)).'.*pi;
V8 = [ 0, 0, w;  0, 0,-w;
       1, 0, 0;  0, 1, 0; -1, 0, 0;  0,-1,0;
       R, R, 0; -R, R, 0; -R,-R, 0;  R,-R,0;
       cos(T).*r, sin(T).*r, T.*0];
F8 = [1,3,25; 1,3,11; 2,3,25; 2,3,11; 1,7,11; 1,7,13; 2,7,11; 2,7,13;
      1,4,13; 1,4,15; 2,4,13; 2,4,15; 1,8,15; 1,8,17; 2,8,15; 2,8,17;
      1,5,17; 1,5,19; 2,5,17; 2,5,19; 1,9,19; 1,9,21; 2,9,19; 2,9,21;
      1,6,21; 1,6,23; 2,6,21; 2,6,23; 1,10,23; 1,10,25; 2,10,23; 2,10,25];
V8 = Rx(V8.*.3, pi/2) + [0,0,3.5];
patch('Faces',F8, 'Vertices',V8, 'FaceColor',[255,223,153]./255,...
      'EdgeColor',[255,223,153]./255, 'FaceAlpha', .2)
%% Draw snow
sXYZ = rand(200,3).*[4,4,5] - [2,2,0];
sHdl1 = plot3(sXYZ(1:90,1),sXYZ(1:90,2),sXYZ(1:90,3), '*', 'Color',[.8,.8,.8]);
sHdl2 = plot3(sXYZ(91:200,1),sXYZ(91:200,2),sXYZ(91:200,3), '.', 'Color',[.6,.6,.6]);
annotation(fig,'textbox',[0,.05,1,.09], 'Color',[1 1 1], 'String','Merry Christmas Matlaber',...
    'HorizontalAlignment','center', 'FontWeight','bold', 'FontSize',48,...
    'FontName','Times New Roman', 'FontAngle','italic', 'FitBoxToText','off','EdgeColor','none');
% Rotate the Christmas tree and let the snow fall
for i=1:1e8
    sXYZ(:,3) = sXYZ(:,3) - [.05.*ones(90,1); .06.*ones(110,1)];
    sXYZ(sXYZ(:,3)<0, 3) = sXYZ(sXYZ(:,3) < 0, 3) + 5;
    sHdl1.ZData = sXYZ(1:90,3); sHdl2.ZData = sXYZ(91:200,3);
    view([i,30]); drawnow; pause(.05)
end
end

Curved XMas Tree

function XmasTree2024_2
fig = figure('Units','normalized', 'Position',[.1,.1,.5,.8],...
    'Color',[0,9,33]/255, 'UserData',40 + [60,65,75,72,0,59,64,57,74,0,63,59,57,0,1,6,45,75,61,74,28,57,76,57,1,1]);
axes('Parent',fig, 'Position',[0,-1/6,1,1+1/3], 'UserData',97 + [18,11,0,13,3,0,17,4,17],...
      'XLim',[-6,6], 'YLim',[-6,6], 'ZLim',[-16, 1], 'DataAspectRatio', [1,1,1], 'NextPlot','add',...
      'Projection','perspective', 'Color',[0,9,33]/255, 'XColor','none', 'YColor','none', 'ZColor','none')
%% Draw Christmas tree
[X,T] = meshgrid(.4:.1:1, 0:pi/50:2*pi);
XM = 1 + sin(8.*T).*.05;
X = X.*XM; R = X.^(3).*(.5 + sin(8.*T).*.02);
dF = @(R, T, X) surf(R.*cos(T), R.*sin(T), -X, 'EdgeColor',[20,107,58]./255,...
    'FaceColor', [20,107,58]./255, 'FaceAlpha',.2, 'LineWidth',1);
CList = [254,103,110; 255,191,115; 57,120,164]./255;
for i = 1:5
    tR = R.*(2 + i); tT = T+i; tX = X.*(2 + i) + i;
    SFHdl = dF(tR, tT, tX);
    [~, ind] = sort(SFHdl.ZData(:)); ind = ind(1:8);
    C = CList(randi([1,size(CList,1)], [8,1]), :);
    scatter3(tR(ind).*cos(tT(ind)), tR(ind).*sin(tT(ind)), -tX(ind), 120, 'filled',...
        'CData', C, 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.3)
    scatter3(tR(ind).*cos(tT(ind)), tR(ind).*sin(tT(ind)), -tX(ind), 60, 'filled', 'CData', C)
end
%% Draw Star of Bethlehem
Rx = @(V, theta) V*[1 0 0; 0 cos(theta) sin(theta); 0 -sin(theta) cos(theta)];
% Rz = @(V, theta) V*[cos(theta) sin(theta) 0;-sin(theta) cos(theta) 0; 0 0 1];
w = .3; R = .62; r = .4; T = (1/8:1/8:(2 - 1/8)).'.*pi;
V8 = [ 0, 0, w;  0, 0,-w;
       1, 0, 0;  0, 1, 0; -1, 0, 0;  0,-1,0;
       R, R, 0; -R, R, 0; -R,-R, 0;  R,-R,0;
       cos(T).*r, sin(T).*r, T.*0];
F8 = [1,3,25; 1,3,11; 2,3,25; 2,3,11; 1,7,11; 1,7,13; 2,7,11; 2,7,13;
      1,4,13; 1,4,15; 2,4,13; 2,4,15; 1,8,15; 1,8,17; 2,8,15; 2,8,17;
      1,5,17; 1,5,19; 2,5,17; 2,5,19; 1,9,19; 1,9,21; 2,9,19; 2,9,21;
      1,6,21; 1,6,23; 2,6,21; 2,6,23; 1,10,23; 1,10,25; 2,10,23; 2,10,25];
V8 = Rx(V8.*.8, pi/2) + [0,0,-1.3];
patch('Faces',F8, 'Vertices',V8, 'FaceColor',[255,223,153]./255,...
      'EdgeColor',[255,223,153]./255, 'FaceAlpha', .2)
annotation(fig,'textbox',[0,.05,1,.09], 'Color',[1 1 1], 'String','Merry Christmas Matlaber',...
    'HorizontalAlignment','center', 'FontWeight','bold', 'FontSize',48,...
    'FontName','Times New Roman', 'FontAngle','italic', 'FitBoxToText','off','EdgeColor','none');
%% Draw snow
sXYZ = rand(200,3).*[12,12,17] - [6,6,16];
sHdl1 = plot3(sXYZ(1:90,1),sXYZ(1:90,2),sXYZ(1:90,3), '*', 'Color',[.8,.8,.8]);
sHdl2 = plot3(sXYZ(91:200,1),sXYZ(91:200,2),sXYZ(91:200,3), '.', 'Color',[.6,.6,.6]);
for i=1:1e8
    sXYZ(:,3) = sXYZ(:,3) - [.1.*ones(90,1); .12.*ones(110,1)];
    sXYZ(sXYZ(:,3)<-16, 3) = sXYZ(sXYZ(:,3) < -16, 3) + 17.5;
    sHdl1.ZData = sXYZ(1:90,3); sHdl2.ZData = sXYZ(91:200,3);
    view([i,30]); drawnow; pause(.05)
end
end

I wish all MATLABers a Merry Christmas in advance!

Steve Eddins
最後のアクティビティ: 2024 年 12 月 12 日 21:25

It's time to retire and replace IMSHOW

Speaking as someone with 31+ years of experience developing and using imshow, I want to advocate for retiring and replacing it.

The function imshow has behaviors and defaults that were appropriate for the MATLAB and computer monitors of the 1990s, but which are not the best choice for most image display situations in today's MATLAB. Also, the 31 years have not been kind to the imshow code base. It is a glitchy, hard-to-maintain monster.

My new File Exchange function, imview, illustrates the kind of changes that I think should be made. The function imview is a much better MATLAB graphics citizen and produces higher quality image display by default, and it dispenses with the whole fraught business of trying to resize the containing figure. Although this is an initial release that does not yet support all the useful options that imshow does, it does enough that I am prepared to stop using imshow in my own work.

The Image Processing Toolbox team has just introduced in R2024b a new image viewer called imageshow, but that image viewer is created in a special-purpose window. It does not satisfy the need for an image display function that works well with the axes and figure objects of the traditional MATLAB graphics system.

I have published a blog post today that describes all this in more detail. I'd be interested to hear what other people think.

Note: Yes, I know there is an Image Processing Toolbox function called imview. That one is a stub for an old toolbox capability that was removed something like 15+ years ago. The only thing the toolbox imview function does now is call error. I have just submitted a support request to MathWorks to remove this old stub.

Paul
最後のアクティビティ: 2024 年 12 月 15 日 20:43

Would a General Hold/Release Functionality be a Good Feature for the Symbolic Toolbox?

The int function in the Symbolic Toolbox has a hold/release functionality wherein the expression can be held to delay evaluation

syms x I

eqn = I == int(x,x,'Hold',true)

eqn =

which allows one to show the integral, and then use release to show the result

release(eqn)

ans =

I think I already submitted an enhancement request for the same functionality for symsum.

Maybe it would be nice to be able to hold/release any symbolic expression to delay the engine from doing evaluations/simplifications that it typically does. For example:

x*(x+1)/x, sin(sym(pi)/3)

ans =

If I'm trying to show a sequence of steps to develop a result, maybe I want to explicitly keep the x/x in the first case and then say "now the x in the numerator and denominator cancel and the result is ..." followed by the release command to get the final result.

Perhaps held expressions could even be nested to show a sequence of results upon subsequent releases.

Held expressions might be subject to other limitations, like maybe they can't be fplotted.

Seems like such a capability might not be useful for problem solving, but might be useful for exposition, instruction, etc.

David
最後のアクティビティ: 2024 年 12 月 9 日 20:01

MATLAB Answers Maintenance Today @1PM

We will be updating the MATLAB Answers infrastructure at 1PM EST today. We do not expect any disruption of service during this time. However, if you notice any issues, please be patient and try again later. Thank you for your understanding.

Mike McLernon
最後のアクティビティ: 2024 年 12 月 3 日 1:06

Summarizing Bluetooth 6.0 and its High Accuracy Ranging

Hi! My name is Mike McLernon, and I’m a product marketing engineer with MathWorks. In my role, I look at the trends ongoing in the wireless industry, across lots of different standards (think 5G, WLAN, SatCom, Bluetooth, etc.), and I seek to shape and guide the software that MathWorks builds to respond to these trends. That’s all about communicating within the Mathworks organization, but every so often it’s worth communicating these trends to our audience in the world at large. Many of the people reading this are engineers (or engineers at heart), and we all want to know what’s happening in the geek world around us. I think that now is one of these times to communicate an important milestone. So, without further ado . . .

Bluetooth 6.0 is here! Announced in September by the Bluetooth Special Interest Group (SIG), it’s making more advances in its quest to create a “world without wires”. A few of the salient features in Bluetooth 6.0 are:

Channel sounding (for accurate distance measurements)
Decision-based advertising filtering (for more efficient channel scanning)
Monitoring advertisers (for improved energy efficiency when devices come into and go out of range)
Frame space updates (for both higher throughput and better coexistence management)

Bluetooth 6.0 includes other features as well, but the SIG has put special promotional emphasis on channel sounding (CS), which once upon a time was called High Accuracy Distance Measurement (HADM). The SIG has said that CS is a step towards true distance awareness, and 10 cm ranging accuracy. I think their emphasis is in exactly the right place, so let’s learn more about this technology and how it is used.

CS can be used for the following use cases:

Keyless vehicle entry, performed by communication between a key fob or phone and the car’s anchor points
Smart locks, to permit access only when an authorized device is within a designated proximity to the locks
Geofencing, to limit access to designated areas
Warehouse management, to monitor inventory and manage logistics
Asset tracking for virtually any object of interest

In the past, Bluetooth devices would use a received signal strength indicator (RSSI) measurement to infer the distance between two of them. They would assume a free space path loss on the link, and use a straightforward equation to estimate distance:

where

received power in dBm,

transmitted power in dBm,

propagation loss in dB,

distance between the two devices, in m,

Bluetooth signal wavelength, in m,

Bluetooth signal frequency, in Hz,

speed of light (3 x 1e8 m/s).

So in this method,

. But if the signal suffers more loss from multipath or shadowing, then the distance would be overestimated. Something better needed to be found.

Bluetooth 6.0 introduces not one, but two ways to accurately measure distance:

Round-trip time (RTT) measurement
Phase-based ranging (PBR) measurement

The RTT measurement method uses the fact that the Bluetooth signal time of flight (TOF) between two devices is half the RTT. It can then accurately compute the distance d as

, where c is again the speed of light. This method requires accurate measurements of the time of departure (TOD) of the outbound signal from device 1 (the Initiator), time of arrival (TOA) of the outbound signal to device 2 (the Reflector), TOD of the return signal from device 2, and TOA of the return signal to device 1. The diagram below shows the signal paths and the times.

If you want to see how you can use MATLAB to simulate the RTT method, take a look at Estimate Distance Between Bluetooth LE Devices by Using Channel Sounding and Round-Trip Timing.

The PBR method uses two Bluetooth signals of different frequencies to measure distance. These signals are simply tones – sine waves. Without going through the derivation, PBR calculates distance d as

, where

distance between the two devices, in m,

speed of light (3 x 1e8 m/s),

phase measured at the Initiator after the tone at

completes a round trip, in radians,

phase measured at the Initiator after the tone at

completes a round trip, in radians,

frequency of the first tone, in Hz,

frequency of the second tone, in Hz.

The mod() operation is needed to eliminate ambiguities in the distance calculation and the final division by two is to convert a round trip distance to a one-way distance. Because a given phase difference value can hold true for an infinite number of distance values, the mod() operation chooses the smallest distance that satisfies the equation. Also, these tones can be as close as 1 MHz apart. In that case, the maximum resolvable distance measurement is about 150 m. The plot below shows that ambiguity and repetition in distance measurement.

If you want to see how you can use MATLAB to simulate the PBR method, take a look at Estimate Distance Between Bluetooth LE Devices by Using Channel Sounding and Phase-Based Ranging.

Bluetooth 6.0 outlines RTT and PBR distance measurement methods, but CS does not mandate a specific algorithm for calculating distance estimates. This flexibility allows device manufacturers to tailor solutions to various use cases, balancing computational complexity with required accuracy and adapting to different radio environments. Examples include simple phase difference calculations and FFT-based methods.

Although Bluetooth 6.0 is now out, it is far from a finished version. The SIG is actively working through the ratification process for two major extensions:

High Data Throughput, up to 8 Mbps
5 and 6 GHz operation

See the last few minutes of this video from the SIG to learn more about these exciting future developments. And if you want to see more Bluetooth blogs, give a review of this one! Finally, if you have specific Bluetooth questions, give me a shout and let’s start a discussion!

Books

Jason
最後のアクティビティ: 2024 年 12 月 2 日 21:06

New book announcement: "Data-driven method for dynamic systems"

I am very excited to share my new book "Data-driven method for dynamic systems" available through SIAM publishing: https://epubs.siam.org/doi/10.1137/1.9781611978162

This book brings together modern computational tools to provide an accurate understanding of dynamic data. The techniques build on pencil-and-paper mathematical techniques that go back decades and sometimes even centuries. The result is an introduction to state-of-the-art methods that complement, rather than replace, traditional analysis of time-dependent systems. One can find methods in this book that are not found in other books, as well as methods developed exclusively for the book itself. I also provide an example-driven exploration that is (hopefully) appealing to graduate students and researchers who are new to the subject.

Each and every example for the book can be reproduced using the code at this repo: https://github.com/jbramburger/DataDrivenDynSyst

Hope you like it!

lazymatlab
最後のアクティビティ: 2024 年 11 月 27 日 15:20

First snow this winter in Korea.

So I made this.

clear
close all
clc
% inspired from: https://www.youtube.com/watch?v=3CuUmy7jX6k
%% user parameters
h = 768;
w = 1024;
N_snowflakes = 50;
%% set figure window
figure(NumberTitle="off", ...
    name='Mat-snowfalling-lab (right click to stop)', ...
    MenuBar="none")
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
axis equal
axis([0, w, 0, h])
ax.Color = 'k';
ax.XAxis.Visible = 'off';
ax.YAxis.Visible = 'off';
ax.Position = [0, 0, 1, 1];
%% first snowflake
 
ht = gobjects(1, 1);
for i=1:length(ht)
    ht(i) = hgtransform();
    ht(i).UserData = snowflake_factory(h, w);
    ht(i).Matrix(2, 4) = ht(i).UserData.y;
    ht(i).Matrix(1, 4) = ht(i).UserData.x;
    im = imagesc(ht(i), ht(i).UserData.img);
    im.AlphaData = ht(i).UserData.alpha; 
    colormap gray
end
%% falling snowflake
tic;
while true
    % add a snowflake every 0.3 seconds
    if toc > 0.3
        if length(ht) < N_snowflakes
            ht = [ht; hgtransform()];
            ht(end).UserData = snowflake_factory(h, w);
            ht(end).Matrix(2, 4) = ht(end).UserData.y;
            ht(end).Matrix(1, 4) = ht(end).UserData.x;
            im = imagesc(ht(end), ht(end).UserData.img);
            im.AlphaData = ht(end).UserData.alpha;
            colormap gray
        end
        tic;
    end
    ax.CLim = [0, 0.0005]; % prevent from auto clim
    % move snowflakes
    for i = 1:length(ht)
        ht(i).Matrix(2, 4) = ht(i).Matrix(2, 4) + ht(i).UserData.velocity;
    end
    if strcmp(get(gcf, 'SelectionType'), 'alt')
        set(gcf, 'SelectionType', 'normal')
        break
    end
    drawnow
    % delete the snowflakes outside the window
    for i = length(ht):-1:1
        if ht(i).Matrix(2, 4) < -length(ht(i).Children.CData)
            delete(ht(i))
            ht(i) = [];
        end
    end
end
%% snowflake factory
function snowflake = snowflake_factory(h, w)
radius = round(rand*h/3 + 10);
sigma = radius/6;
snowflake.velocity = -rand*0.5 - 0.1;
snowflake.x = rand*w;
snowflake.y = h - radius/3;
snowflake.img = fspecial('gaussian', [radius, radius], sigma);
snowflake.alpha = snowflake.img/max(max(snowflake.img));
end

Chen Lin
最後のアクティビティ: 2024 年 12 月 7 日 7:25

MathWorks Merch Shop Is Open

Hello, MATLAB fans!

For years, many of you have expressed interest in getting your hands on some cool MathWorks merchandise. I'm thrilled to announce that the wait is over—the MathWorks Merch Shop is officially open!

In our shop, you'll find a variety of exciting items, including baseball caps, mugs, T-shirts, and YETI bottles.

Visit the shop today and explore all the fantastic merchandise we have to offer. Happy shopping!

Hans Scharler
最後のアクティビティ: 2024 年 11 月 11 日

[cross posted] List of niche features you want in generic Matlab

Reddit Link: https://www.reddit.com/r/matlab/comments/1gojfod/list_of_niche_features_you_want_in_generic_matlab/

Image Analyst
最後のアクティビティ: 2024 年 11 月 7 日

Shade between curves

It would be nice to have a function to shade between two curves. This is a common question asked on Answers and there are some File Exchange entries on it but it's such a common thing to want to do I think there should be a built in function for it. I'm thinking of something like

plotsWithShading(x1, y1, 'r-', x2, y2, 'b-', 'ShadingColor', [.7, .5, .3], 'Opacity', 0.5);

So we can specify the coordinates of the two curves, and the shading color to be used, and its opacity, and it would shade the region between the two curves where the x ranges overlap. Other options should also be accepted, like line with, line style, markers or not, etc. Perhaps all those options could be put into a structure as fields, like

plotsWithShading(x1, y1, options1, x2, y2, options2, 'ShadingColor', [.7, .5, .3], 'Opacity', 0.5);

the shading options could also (optionally) be a structure. I know it can be done with a series of other functions like patch or fill, but it's kind of tricky and not obvious as we can see from the number of questions about how to do it.

Does anyone else think this would be a convenient function to add?

Books

Image Analyst
最後のアクティビティ: 2024 年 11 月 8 日

My favorite image processing books

My favorite image processing book is The Image Processing Handbook by John Russ. It shows a wide variety of examples of algorithms from a wide variety of image sources and techniques. It's light on math so it's easy to read. You can find both hardcover and eBooks on Amazon.com Image Processing Handbook

There is also a Book by Steve Eddins, former leader of the image processing team at Mathworks. Has MATLAB code with it. Digital Image Processing Using MATLAB

You might also want to look at the free online book http://szeliski.org/Book/

cui,xingxing
最後のアクティビティ: 2024 年 12 月 11 日 1:04

MATLAB is looking forward to having an intelligent AI programming assistant similar to GitHub Copilot

In the past two years, large language models have brought us significant changes, leading to the emergence of programming tools such as GitHub Copilot, Tabnine, Kite, CodeGPT, Replit, Cursor, and many others. Most of these tools support code writing by providing auto-completion, prompts, and suggestions, and they can be easily integrated with various IDEs.

As far as I know, aside from the MATLAB-VSCode/MatGPT plugin, MATLAB lacks such AI assistant plugins for its native MATLAB-Desktop, although it can leverage other third-party plugins for intelligent programming assistance. There is hope for a native tool of this kind to be built-in.

Chen Lin
最後のアクティビティ: 2024 年 11 月 10 日

Vote on MATLAB Short Movies and win MATLAB T-shirts Before Nov. 10th!

What incredible short movies can be crafted with no more than 2000 characters of MATLAB code? Discover the creativity in our GALLERY from the MATLAB Shorts Mini Hack contest.

Vote on your favorite short movies by Nov.10th. We are giving out MATLAB T-shirts to 10 lucky voters!

Tips: the more you vote, the higher your chance to win.

Chen Lin
最後のアクティビティ: 2024 年 11 月 1 日

Experience Insight and Innovation with Keynote Speaker, María Elena Gavilán Alfonso!

Mark your calendar for November 13–14 and get ready for two days of learning, inspiration, and connections!

We are thrilled to announce that MathWork’s incredible María Elena Gavilán Alfonso was selected as a keynote speaker at this year’s MATLAB Expo.

Her session, "From Embedded to Empowered: The Rise of Software-Defined Products," promises to be a game-changer! With her expertise and insights, María is set to inspire and elevate our understanding of the evolving world of software-defined products.

Watch a sneak peek here and get a taste of what's to come!

Interested in attending? Sign up at matlabexpo.com/online

matlab expo