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Zhaoxu Liu / slandarer
Last activity 約7時間前

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!

David
Last activity 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.

https://blogs.mathworks.com/loren/2016/04/01/the-queens-matlab/?s_tid=srchtitle_site_search_4_rgb2gray

Image Analyst
Last activity 2024 年 12 月 5 日 5:43

Difference between gray and grey

To convert a color image to grayscale, use rgb2gray, or is it rgb2grey?

(1) Ben Hayden: "When you are using matlab and you want to get the square root of the result of the most recent command line operation." — Bluesky

Mike Croucher
Last activity 2024 年 12 月 2 日 23:15

An unintentional MATLAB meme

I enjoyed this post on BlueSky yesterday

Image Analyst
Last activity 2024 年 12 月 2 日 22:14

MATLAB Ornament

Christmas season is underway at my house:

(Sorry - the ornament is not available at the MathWorks Merch Shop -- I made it with a 3-D printer.)

Frédéric Dorschner
Last activity 2024 年 11 月 22 日 13:04

Colors to differenciate input, output and intermediate signals

Is it possible to differenciate the input, output and in-between wires by colors?

Chen Lin
Last activity 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!

Bob Gastineau
Last activity 2024 年 12 月 4 日 1:12

AI Chat playground accuracy metrics

I was curious to startup your new AI Chat playground.

The first screen that popped up made the statement:

"Please keep in mind that AI sometimes writes code and text that seems accurate, but isnt"

Can someone elaborate on what exactly this means with respect to your AI Chat playground integration with the Matlab tools?

Are there any accuracy metrics for this integration?

Chen Lin
Last activity 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
Last activity 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

https://www.youtube.com/watch?v=5vbk0TwkokM

Stephen23
Last activity 2024 年 11 月 2 日

Prime Numbers ... with a Regular Expression!

I know we have all been in that all-too-common situation of needing to inefficiently identify prime numbers using only a regular expression... and now Matt Parker from Standup Maths helpfully released a YouTube video entitled "How on Earth does ^.?$|^(..+?)\1+$ produce primes?" in which he explains a simple regular expression (aka Halloween incantation) which matches composite numbers:

Here is my first attempt using MATLAB and Matt Parker's example values:

fnh = @(n) isempty(regexp(repelem('*',n),'^.?$|^(..+?)\1+$','emptymatch'));
fnh(13)
ans = logical
   1
fnh(15)
ans = logical
   0
fnh(101)
ans = logical
   1
fnh(1000)
ans = logical
   0

Feel free to try/modify the incantation yourself. Happy Halloween!

https://www.youtube.com/watch?v=wjZofJX0v4M

David
Last activity 2024 年 10 月 29 日

The best high-level introduction to LLM's and Transformers I've seen

Watch episodes 5-7 for the new stuff, but the whole series is really great.

Chen Lin
Last activity 2024 年 10 月 22 日

Introducing Our New Blog: Semiconductor Design and Verification

Welcome to the launch of our new blog area, Semiconductor Design and Verification! The mission is to empower engineers and designers in the semiconductor industry by streamlining architectural exploration, optimizing the post-processing of simulations, and enabling early verification with MATLAB and Simulink.

Meet Our Authors

We are thrilled to have two esteemed authors:

@Ganesh Rathinavel and @Cristian Macario Macario have both made significant contributions to the advancement of Analog/Mixed-Signal design and the broader communications, electronics, and semiconductor industries. With impressive engineering backgrounds and extensive experience at leading companies such as IMEC, STMicroelectronics, NXP Semiconductors, LSI Corporation, and ARM, they bring a wealth of knowledge and expertise to our blog. Their work is focused on enhancing MathWorks' tools to better align with industry needs.

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Don’t miss the first post: Accelerating Mixed-Signal Design with Early Behavioral Models, where they explore how early behavioral modeling can accelerate mixed-signal design and enhance system efficiency.

David
Last activity 2024 年 10 月 16 日

Introducing Code Analyzer

We are happy to announce the addition of a new code analyzing feature to the AI Chat Playground. This new feature allows you to identify issues with your code making it easier to troubleshoot.

How does it work?

Just click the ANALYZE button in the toolbar of the code editor. Your code is sent to MATLAB running on a server which returns any warnings or errors, each of which are associated to a line of code on the right side of the editor window. Hover over each line marker to view the message.

Give it a try and share your feedback here. We will be adding this new capability to other community areas in the future so your feedback is appreciated.

Thank you,

David

code analyzer

Chen Lin
Last activity 2024 年 10 月 9 日

New feature Announcement - Create a Poll in Discussions

We are thrilled to announce that every community member now has the ability to create a poll in Discussions, allowing you to gather votes and opinions from the community.

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You can find the ‘Create a Poll’ link just below the text box (see screenshot below). Please note that the default type of content is a ‘Discussion’. To start a poll, simply click the link.

Creating a poll is straightforward. You can add up to 6 choices for your poll and set the duration from 1 to 6 weeks.

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Thoughts?

We can’t wait to see what interesting polls our community will create. Meanwhile, if you have any questions or suggestions, feel free to leave a comment.

saket singh
Last activity 2024 年 10 月 13 日

Tools Opinion

hello i found the following tools helpful to write matlab programs. copilot.microsoft.com chatgpt.com/gpts gemini.google.com and ai.meta.com. thanks a lot and best wishes.

Toshiaki Takeuchi
Last activity 2024 年 10 月 9 日

MATLAB EXPO 2024 is coming November 13–14 Online: Sign up for free

If you are interested in AI, Autonomous Systems and Robotics, and the future of engineering, don't miss out on MATLAB EXPO 2024 and register now.

You will have the opportunity to connect with engineers, scientists, educators, and researchers, and new ideas.

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From Embedded to Empowered: The Rise of Software-Defined Products - María Elena Gavilán Alfonso, MathWorks
The Empathetic Engineers of Tomorrow - Dr. Darryll Pines, University of Maryland
A Model-Based Design Journey from Aerospace to an Artificial Pancreas System - Louis Lintereur, Medtronic Diabetes

Discussions Update: A Page Redesign to Focus on Users

We are thrilled to announce the redesign of the Discussions leaf page, with a new user-focused right-hand column!

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Address Readers’ Needs:

Previously, the right-hand column displayed related content, but feedback from our community indicated that this wasn't meeting your needs. Many of you expressed a desire to read more posts from the same author but found it challenging to locate them.

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Chen Lin
Last activity 2024 年 10 月 15 日

Join Community Contest 2024: Create Short Movies!

We are excited to invite you to join our 2024 community contest – MATLAB Shorts Mini Hack! Last year, we challenged you to create a 48-frame animation. In 2024, we are increasing the frame count to 96 and supporting audio. Your mission? Create a short movie!

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Timeframe

This contest runs for 5 weeks, from Oct. 7th to Nov. 10th.

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Create a new short movie or remix an existing one with up to 2,000 characters of code.
Vote or comment on the short movies you love!

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