MATLAB Answers

How to get value from string II = strcat('A', num2str(la));

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Ole 2016 年 3 月 11 日
編集済み: Stephen Cobeldick 2019 年 6 月 19 日
I want to plot few matrices A1 A2 A3 A4 A5 and call them in loop to make a movie. I am trying to make a string II = strcat('A', num2str(la)); but I can not get the values of the previously defined A1 matrix ?
The code below returns an error that II must be a matrix but is string A1 with no values.
A1 = rand(10,10); A2 = rand(10,10); A3 = rand(10,10); A4 = rand(10,10); A5 = rand(10,10);
for la = 1 : 5
II = strcat('A', num2str(la));
shading interp

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Stephen Cobeldick
Stephen Cobeldick 2016 年 3 月 12 日
And note that you should not create numbered variables and then try to loop over them. Put all of your data into one variable (an ND array perhaps) and then loop over the dimensions of that array.
The idea of looping over separate numbered variables often occurs to beginners, but this is a slow, buggy, and obfuscated way to code:

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回答 (2 件)

Image Analyst
Image Analyst 2016 年 3 月 11 日
pcolor takes numbers, not character arrays, so why are you trying to create a character array?
And did you know that pcolor does not show you the last row or column? Use imshow instead
wideImage = [A1,A2,A3,A4,A5];
imshow(wideImage, []);
No for loop needed at all.

  2 件のコメント

Ole 2016 年 3 月 11 日
Thanks. This displays 5 matrices next to each other. How can be used to plot in a video one A matrix at a time ?
Image Analyst
Image Analyst 2016 年 3 月 11 日
If you want a video of this, you'll have to make up an image first. Then use text() to display text over the image. Then use VideoWriter to write the image frames to a video file, like in the attached example.

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