Converting idl to matlab and error in code

Hi, I'm trying to convert IDL codes to matlab, the idea is i have dark images and flat images and i'm trying to select them both for another section of the code

I'm stuck on the idl function known as FLOAT

IDL codes

flatlist = file_search(workdir,'flat*')

nflat = n_elements(flatlist)

darklist = file_search(workdir,'dark*')

ndark = n_elements(darklist)

dark = fltarr(xsize,ysize)

flat = fltarr(xsize,ysize)

for k = 0,ndark-1 do begin

      imtemp = read_tiff(darklist(k))

      dark = dark+float(imtemp)/ndark

      ;Average dark images

endfor

Matlab version

[darklist,workdir] = uigetfile({'*.jpg;*.tif;*.png;*.gif','All Image Files';...
          '*.*','All Files'},'Select the dark image(s)','MultiSelect', 'on');

if(~iscell(darklist))

       ndark=1;

else

      ndark = numel(darklist);

end

dark = zeros(ysize,xsize);

flat = zeros(ysize,xsize);

for k = 1:ndark  

      if(~iscell(darklist))

            imtemp = imread(darklist);

      else

          imtemp = imread(darklist{k});

          dark = dark+double(imtemp)./ndark;

      end

end

I'm not sure if its double, also i'm getting this error

Error in 
        imtemp = imread(darklist{k});

help pls

Thanks

Answer 1

[Walter Roberson]

IDL's float(x) call corresponds to real(single(x)) in MATLAB. In the case where the data is known to be real-valued already (which is the case for all images except for some advanced TIFF files, and possibly some dicom files), then that would simplify to just single(x)

"also i'm getting this error"

You would not be having that error if you had used the code I gave you in https://www.mathworks.com/matlabcentral/answers/351336-error-trying-to-read-files#answer_276554

The problem is that your files are in some directory other than your current directory. I showed you earlier,

     flatlist = fullfile( workdir, {flatinfo.name} );

and

     darklist = fullfile( workdir, {darkinfo.name} );