Generating Plots From Cell Array

Question

itend 2017-8-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/354068-generating-plots-from-cell-array

评论： Star Strider 2017-8-25

Hello,

I have a cell array (3 x 4), called output, containing a 1024 x 1024 matrix in each cell. I want to plot the 4 matrices in ouput{1,:}. Furthermore, I have a structure, called dinfo, which correspondingly contains the names of each matrix (field with matrix names = "name"). I want each image to be titled with its name. Here is the code I have written thus far:

for i = 1:length(output{1,:}) 
    figure 
    imagesc(output{1,i});
    colormap('jet')
    colorbar;
    title(num2str(dinfo.name(i)))
end

I keep getting the error that "length has too many input arguments". If I change the code to avoid the length function-related error:

for i = 1:4 
    figure 
    imagesc(output{1,i});
    colormap('jet')
    colorbar;
    title(num2str(dinfo.name(i)))
end

I get the error, "Expected one output from a curly brace or dot indexing expression, but there were 4 results".

Any thoughts on how I could resolve both of these errors?

Thank you for your time :)

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Answer 1

Star Strider 2017-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/354068-generating-plots-from-cell-array#answer_279228

在 MATLAB Online 中打开

This works for me (in R2017a):

dinfo.name = [1,2,3,4];                                 % Create Structure
output = {rand(5), rand(5), rand(5), rand(5)};          % Create Cell Array
for i = 1:length(output) 
    figure 
    imagesc(output{1,i});
    colormap('jet')
    colorbar;
    title(num2str(dinfo.name(i)))
end

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itend 2017-8-25

编辑：itend 2017-8-25

Hello,

Thank you for your response. The issue with the length function has been resolved. However, calling the field from the structure array is still problematic.

The structure has 6 fields, each field has 4 entries. I am interested in labeling each output image produced in the code with its corresponding title from the "name" field in the structure. In other words, images 1 -> 4 get labeled with names 1 -> 4 obtained from the "name" field in the structure, respectively. I am still getting the same error, any suggestions?

Star Strider 2017-8-25

Iâ€™m lost.

You initially wrote â€˜I have a cell array (3 x 4), called outputâ€™, so I created a cell array to (successfully) test my code. Now it seems youâ€™re addressing a structure, and structure referencing is different. I donâ€™t have your structure array, so I canâ€™t write code specifically to reference it in your loop. Please see the documentation on Access Data in a Structure Array (link) for details.

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