Problem with saving plots

I have the below code. I want to save the file in bmp format.

clearvars
indir = '.';  %current directory
outdir = 'C:\Users\gagan\Downloads\testing_lab\Stage-1 testing\plots';  %where to write the results
files = dir( fullfile(indir, '*.csv'));
for file = files'
    inname = fullfile(file.folder, file.name);
    n = readmatrix(inname);
    m = rescale(n, -1, 1, 'InputMin',2301,'InputMax',3642)+0.527;
    
    [filepath,name,ext] = fileparts(inname);
    outname = fullfile(outdir, name + '.bmp');
    plot(m) ;  % use your variable in the plot 
    saveas(gcf,outname)
end

But when I run the below code I get error as:

Arrays have incompatible sizes for this operation.
Error in automated_making_plots (line 11)
    outname = fullfile(outdir, name + '.bmp');

So, to resolve, I modify the below two line in the code above as:

    outname = fullfile(outdir, name);
    saveas(gcf,outname,'bmp')

Now, my code runs but the files that it saves is not in the bmp format but MATLAB is instead taking the string after the "." as the fomat. For example my file is "T15.11.02.38.csv", so instead of taking name as "T15.11.02.38.bmp", it creates file but with extension ".38".

Can someone please help? Thanks

Answer 1

[Image Analyst]

Try this:

clearvars
indir = '.';  %current directory
outdir = 'C:\Users\gagan\Downloads\testing_lab\Stage-1 testing\plots';  %where to write the results
files = dir( fullfile(indir, '*.csv'));
for k = 1 : length(files)
    inname = fullfile(files(k).folder, files(k).name);
    n = readmatrix(inname);
    m = rescale(n, -1, 1, 'InputMin',2301,'InputMax',3642)+0.527;
    % Now plot.
    plot(m) ;  % use your variable in the plot 
    % Now that you have a figure up, save the figure window
    [~, nameNoExt, ext] = fileparts(inname);
    fullOutputFileName = fullfile(outdir, [nameNoExt, ext]);
    exportgraphics(gcf, fullOutputFileName);
end

[Giggs B.]

Hi, I get this error:

Error using exportgraphics
File format 'csv' is not valid for export.

Error in test_code (line 14)
    exportgraphics(gcf, fullOutputFileName);

[Image Analyst]

Sorry, you need to change the extension

fullOutputFileName = fullfile(outdir, [nameNoExt, '.bmp'])

[Giggs B.]

I am still getting error with bmp, I even tried png. But same error:

Error using exportgraphics
File format 'bmp' is not valid for export.

Error in test_code (line 14)
    exportgraphics(gcf, fullOutputFileName);

[Image Analyst]

Well you shouldn't be using BMP anyway - it's nearly obsolete. Use .PNG instead.

[Giggs B.]

Thank you!