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Simon Chan


Hospital Authority

Active since 2021

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Answered
Add '_max' to odd variable names and '_min' to even ones.
Suppose the table is called T, then try the following: T.Properties.VariableNames(1:4) = {'t_max','t_min','ang_azi_max','ang_az...

4 dagen ago | 0

Answered
How do a cell2mat conversion for a non-uniform cell to a matrix
Do it in several steps as follows: idx.size = cellfun(@length,DD); idx.padded = max(idx.size)-idx.size; DDpadded = cellfun(@(...

4 dagen ago | 0

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Answered
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...

6 dagen ago | 0

Answered
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...

6 dagen ago | 0

Answered
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.*...

6 dagen ago | 0

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Answered
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...

6 dagen ago | 0

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Answered
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...

9 dagen ago | 1

Answered
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...

9 dagen ago | 0

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Answered
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 = ...

11 dagen ago | 0

Answered
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...

19 dagen ago | 0

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Answered
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...

20 dagen ago | 1

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Answered
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*...

20 dagen ago | 0

Answered
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')...

25 dagen ago | 0

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

26 dagen ago | 1

Answered
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...

28 dagen ago | 0

Answered
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),[]...

28 dagen ago | 1

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Answered
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...

29 dagen ago | 0

Answered
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...

ongeveer een maand ago | 0

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Answered
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;

ongeveer een maand ago | 0

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Answered
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(...

ongeveer een maand ago | 0

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Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 1

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Answered
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...

ongeveer een maand ago | 0

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Answered
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...

ongeveer een maand ago | 1

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Answered
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...

ongeveer een maand ago | 0

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Answered
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);

ongeveer een maand ago | 1

Answered
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); ...

ongeveer een maand ago | 0

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

ongeveer een maand ago | 0

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Answered
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...

ongeveer een maand ago | 0

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Answered
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.

ongeveer een maand ago | 0

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