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Combining Rows of a Table based on Matching first column entry?
Tcell ={'Air Force' 2011 13 7 6 'Akron' 2011 12 1 11 'Alabama...

4年以上前 | 0

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3d plots with multi inputs
There are may ways of volume visualization. Check the document site: https://www.mathworks.com/help/matlab/volume-visualization...

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Warning: Matrix is singular to working precision
Make sure your matrix "a" is full rank (rank(a) should be 6 instead of 5). a=[1, 0, 0, 0, -0.25, 0; 0, 1, 0, -0.25, 0, -0.25; 1...

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plot the surface using ezsurf for the surfaces 𝑧1 = 𝑥cos (𝑦), 𝑧2 = 𝑦𝑒^( 𝑥 2−5) and label the axes.
ezsurf(@(x, y) x .* cos(y)) % Leave the next one for you to try

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Making a look-up table periodic
theta = (-180:180); x = randn(size(theta)); % Look up table/interpolant F = griddedInterpolant(theta, x); % wrap the input...

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Is it possible to concatenate columns of a tensor into a single column?
A =randn(10,1,10); B = A(:)

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"find" is not finding what I want it to?
Try the following: AI=find(3.0<areas & areas<200); % AE=find(3.0>areas & areas<200); AE=find(3.0>areas | areas<200);

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Bar width according to a duration type data in a bar graph
x = 1:10; % x data y = randi(10, size(x)); % y data w = rand(size(x))/2; % width for i =1 : nume...

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How to factor symbolic equations
syms c SE1=c^2-2*c+1; SQ1=SE1==25; % you can factor a symbolic function but not an equation factor(SE1) factor(SE1-25)

4年以上前 | 2

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Error while reading image in loop to perform some operation on all images in folder
function recursiveFile() % Files=dir('D:\datasets\PRImA_LayoutAnalysisDataset\PRImA Layout Analysis Dataset\Images\*.tif'); fo...

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How to plot multiple audio files horizontally in MATLAB
n = 1000; t = (0:n-1)'*.0001; x = randn(n, 6); % 1000 samples 6 channels y = 0.2*x + (1:6); % scale the x by 0.2,...

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what to do when i get unrecognized function or variable
You need to define the function y(t). y = @(t) cos(t); % eg. y(t) = cos(t) tmin=-3;tmax=5;dt=0.02; t=tmin:dt:tmax; y...

4年以上前 | 1

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interpreting frequency vs phase plot in fft
The output of the FFT has zero values in most frequency bins(with some leaking effect due to the fact that frequencies of sinoso...

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How to change the color of singular bars on a bar graph if the value is below the lower limit of the error bar?
weeks = [12:24] weight = [0.128125 0.16125 0.205 0.258125 0.321875 0.39875 0.491875 0.601875 0.73 0.879375 0.948125 1.1 1.32];...

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(Important )How to generate numbers in matlab? Need help.
You can generate 2 random numbers in the given range and sort these 2 numbers out. img1 = imread('peppers.png'); data=5; %100;...

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Why do upsample and downsample commands give wrong results in start of sequence?
All time axes start from 0. % Up/Down Sampler clear all close all clc x=[1 2 3 4]; % Input Sequence y=upsample(x,3); % Ups...

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Plotting ellipses with parametric curves
% First ellipse t = linspace(0,2*pi,200); a = sqrt(2); b = sqrt(2/3); x = a.*cos(t); y = b.*sin(t); %plot(((1/2)*(x.^2)), ...

4年以上前 | 1

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How to convert Data from 'yyyyMMddhhmm' format to datetime format
dstr = ["202201010000.000" "202301010000.000"] t = datetime(dstr,'InputFormat','yyyyMMddHHmm.SSS')

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how to smooth the corners of a map
You can interpolate the data first before using contourf. For example, you can use scatteredInterpolant (with method "natural) ...

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Deleting certain elements from an array without looping
fileNames = {'ThisIsADummyFile', '012345678901234567891'} idx = cellfun(@(x) length(x)~=21, fileNames) fileNames(idx) =[]

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How to find pythagorean triangle's hypotenuse in a matrix?
a = [5 8 12 3; 8 12 63 20; 9 84 144 20; 24 11 15 180]; b = [12 6 5 4; 15 35 16 21; 40 13 17 99; 7 60 112 19]; c = sqrt(a.^2 + ...

4年以上前 | 1

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How can I make an animation out of contourf plots?
figure for t=10:10:100 % t is the percent number in the file name subplot(121) fn = "T_timestep_"+t"_precent"; ...

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plot half Wave rectied sindus
t=0:0.01:1; y=10*sin(8*pi*t); y(y<0) = 0; plot(t, y)

4年以上前 | 1

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Does intlinprog find a local minimum or global minimum?
MILP is NP-hard problem. All solvers require some heuristic rules and the global optimum can not guarenteed for larger problems...

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hw 2 solve this
y = (cosd(35) - secd(35)^2)/tand(70)

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How can I plot 'period' by using fft functoin??
Fs = 1000; % Sampling frequency T = 1/Fs; % Sampling period L = 1500; ...

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envelope rms implementation review
"envelope" removes the mean first before doing movrms and it restore the mean offset in the end. If you nake sure the signal is...

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Why Does fplot() Show a Phantom Pole?
The default number of t points (23) is not big enough to show the details around t=0. Change it to a larger value. syms t real...

4年以上前 | 1

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Interpolating over a grid
Use scatteredInterpolant instead. tykkelse_002536 = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/...

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How to create helical sinusoidal plot in matlab
Is this what you want? dh = 2; %0.5; % adjust this to see more detains a = 42; h = 20; R = 45; N = h/dh; m = 1; for n =...

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