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Simon Chan


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2021 以来アクティブ

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Differentiate between oval and circle shaped images using MATLAB
You may try function bwconvhull by adding the following 2 lines. However, I am not sure how robust it is for other pictures. B...

約16時間 前 | 0

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how to join the values of different cells in different columns in one cell ?
Suppose you read the file using function readtable and the name of the table is T, then variable C in the following will give yo...

約16時間 前 | 0

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How to change the color of my plots
Just put the color code for the markers. May try the following: for n=.3*N:N x=(1-d).*x.*exp(a.*(1-x).*((x/0.2)-1))+d.*y.*...

約23時間 前 | 0

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Fix "index exceeds number of array elements"
j is going to be the index and hence theta_x should not be use Try the following: for j=1:length(theta_x) s(j)=L1(j)^2+L2...

1日 前 | 0

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How to use writematrix to create a single xlsx file with multiple sheets with name of the analysis file?
Use function <https://www.mathworks.com/help/matlab/ref/fileparts.html fileparts> to extract the name instead of the entire file...

4日 前 | 1

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find ID's of repeated values in array
You may use a for loop as follows: idx = zeros(1,length(t1)); for k = 1:length(t1) idx(k) = find(ismember(t2,t1(k))); en...

4日 前 | 0

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cration of contents inside the cell array of uniform size
May try the following to add NaN to the new rows load('data.mat'); addrow = cellfun(@(x) 8-size(x,1),Data,'uni',0); result = ...

6日 前 | 0

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Why is it not working?
Index jj is not defined inside the for-loop, i guess the code should be modified as the following for ii=1:26 for jj = 1:2...

14日 前 | 0

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Index in position 2 exceeds array bounds (must not exceed 1) ?
One of the input argument is variable 'c' and you use the same name again for the size of variable 'a' and hence gives you an er...

15日 前 | 1

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Area fill under a curve
Check the MATLAB documentation about area. w is a function handle and it is not supported. Try the following: x=linspace(0,2*...

15日 前 | 0

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Separate 24 digits single array of data loaded from file into 6 different arrays
Try the following by converting the text using function num2cell. clear; clc; fid = fopen('data.txt'); d = textscan(fid,'%s')...

20日 前 | 0

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Edge detection in gradient images
Try Otsu's method rawdata=imread('capture 1.png'); I = rgb2gray(rawdata); level = graythresh(I); BW = imbinarize(I,level); ...

20日 前 | 1

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what happened to my install ?how to solve this proplem?
If your installation runs on WIndows, please check whether you have adminstrator right or not. On the other hand, you may refer...

23日 前 | 0

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Plot 3D surface from Excel .csv File
You may extract the data using function readmatrix. clear; clc; rawdata = readmatrix('data.csv'); x = reshape(rawdata(:,1),[]...

23日 前 | 1

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How to write new data to the existing excel file?
You may replace the entire loop by using 'Append' as follows: writetable(T,'Results.xlsx','UseExcel', true, 'WriteMode','Append...

24日 前 | 0

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Plots with different colors
Put the index and hold on inside the loop figure(1) for i=1:length(Re) if Re(i) < 2*10^3 loglog(Re(i),f(i),'xb','Lin...

27日 前 | 0

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How can I set the colorbar for a specific series of value ?
Adjust the Limits and Ticks as follows: cb = colorbar cb.Limits = [300 2100]; cb.Ticks=300:300:2100;

27日 前 | 0

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Best fit line in log-log scale
Like this? p=polyfit(log(X),log(Y),1); y=polyval(p,log(X)); figure(1) loglog(Re,f,'x','LineWidth',1) hold on loglog(X,exp(...

28日 前 | 0

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How to sort a 3D matrix according to the value of each element?
If I understand correctly, you would like the larger value(s) in the last rows and the largest one on the bottom right hand cor...

28日 前 | 0

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using matlab fileread function for some portion of text data
Use function textscan to read the first 50 lines and the header will be stored on a cell array. fid = fopen(fullfile(filepath,f...

29日 前 | 1

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Subplot arrangement: 6 by 2 plot
Try this: figure(1) subplot(6,2,1) plot(1:10,randi(10,1,10)) hold on subplot(6,2,3) plot(1:10,randi(10,1,10)) subplot(6,2...

29日 前 | 0

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How to label the centers of circles according to their position on axes?
Try this and still using function text: clear; clc; I = ones(400,600); sorted_centers_x = repmat(50:100:550,1,4); sorted_cen...

29日 前 | 1

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How to use imwrite from dicom to png
It may contains more than one image and hence you need to save it one by one: Following code for your reference: [I, cmap] = d...

29日 前 | 0

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Specific conditions for array elements
You may simply combine them together as follows: B = (A>10)*(9^2)+(A==10)*0+(A<10)*(20^0.5);

30日 前 | 1

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Replacing Empty Cells by NaN
T.Var1=NaN(size(T.Var1,1),1); % Replace T.Var1 by NaN T.Var16=NaN(size(T.Var16,1),1); ...

30日 前 | 0

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How do I concatenate the same table n-times vertically?
Try this: biggertable=repmat(T,1000,1);

30日 前 | 0

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I'm working on an example where I'm getting a logical error possibly. I want to replace every element of a matrix by the minimum of its neighborhood.
The value of N will be very large in the loop and gives an error. Try the following to replace each element of the matrix by by...

約1ヶ月 前 | 0

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Unrecognized function or variable 'wavread'.
It requires Signal Processing Toolbox, type 'ver' in the Command WIndow to check whether you have the right Toolbox or not.

約1ヶ月 前 | 0

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stl file rendering is not working can you help me to solve it?
You may need <https://www.mathworks.com/help/matlab/ref/trisurf.html trisurf> or <https://www.mathworks.com/help/matlab/ref/trip...

約1ヶ月 前 | 0

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How to extract matrix from cell?
Try this: iwant=cat(4,myCell{32:59});

約1ヶ月 前 | 0

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