MATLAB: How top solve error “Subscript indices must either be real positive integers or logicals.”

Image Processing Toolboxsubscript indices must either be real positive integers or logicals. getting this error for psnr() function.

I am getting this error while using psnr() function to find signal to noise ratio. Plz help me to get out of this. I called function like:psnr=psnr(one,two). Both are uint8 images.

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psnr() is a built in function. So you can't assign it to itself. Pick another output return variable name, like thisPsnr

thisPsnr = psnr(one, two);

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MATLAB: XLSREAD: “Subscript indices must either be real positive integers or logicals.”

.xlsx files are .zip files that contain directories and a series of different .xml files, including information about the different worksheet names.

The routine to parse the worksheet names is expecting that the XML will look like similar to

<sheet name="sheet1" sheetId="1" r:id="rId1"/>

but instead in that file it looks like

<sheet name= "sheet1" sheetId="1" r:id="rId1"/>

notice the space between the = and the " that follows it.

I do not know enough about the XML standards to know whether a space there is permitted or not, but what we do know is that in those files the space is there . And so whether it is "proper" or not, we can hack around that part of the problem fairly easily.

edit( fullfile(toolboxdir('matlab'),'iofun','private','getSheetNames.m') )

and head to line 19, which will have

      match = regexp(workbook_xml, '<sheet[^>]+name="(?<sheetName>[^"]*)"[^>]*r:id="(?<rid>[^>]+?)"[^>]*/>|<sheet[^>]*r:id="(?<rid>[^>]+?)"[^>]*name="(?<sheetName>[^"]*)"[^>]*/>', 'names');

Change that to

      match = regexp(workbook_xml, '<sheet[^>]+name=\s*"(?<sheetName>[^"]*)"[^>]*r:id="(?<rid>[^>]+?)"[^>]*/>|<sheet[^>]*r:id="(?<rid>[^>]+?)"[^>]*name=\s*"(?<sheetName>[^"]*)"[^>]*/>', 'names');

And save the file. You should then be able to xlsinfo() the file.

(You might need to do a "rehash toolboxcache", maybe)

However, more is needed to be done to xlsread() the file. It appears the xml does not have a dimension declaration; I will need to investigate how to deal with that.

MATLAB: Fixing Error “Subscript indices must either be real positive integers or logicals.”

I think you missed the multiplication operator *

I1 = Io*(((2.*besselj(1,q).*((pi.*q)/(lam1.*N))))/(((pi.*q)/lam1.*N))).^2;

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MATLAB: XLSREAD: “Subscript indices must either be real positive integers or logicals.”

MATLAB: Fixing Error “Subscript indices must either be real positive integers or logicals.”

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