MATLAB: Sir plz help me to rectify this error

digital image processing

X=reshape(x,size(Y));

where x=1; and Y=256 * 256 uint8

I got the error like this

"To RESHAPE the number of elements must not change."

Best Answer

Since x=1, you can use ones():

X = ones(size(Y)); % X is a double

If x is not one, but some other scalar, then you can use.

X = x * ones(size(Y)); % X is a double

If you want X to also be uint8, pass that class in:

X = ones(size(Y), 'uint8'); % Now X will also be uint8

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MATLAB: How to multiply two ‘int32’ data type matrices in MATLAB

The ability to do a direct matrix multiplication operation on two ‘int32’ variables is not available in MATLAB.

You can use the following code to work around this issue:

function z = mtimes(x,y)
if (isscalar(x) || isscalar(y))
      z = x .* y;
      return;
end
m = size(x,1);
n = size(x,2);
if (n ~= size(y,1))
      error('mmultmanual:size', 'matrix inner dimensions do not agree');
end
p = size(y,2);
z = zeros(m,p,class(x));
for i = 1:m
          z(i,1:p) = sum(bsxfun(@times, reshape(x(i,:),n,1), y), 1);
end

Place the above code in a file called ‘mtimes.m’ and save this file in a directory with name ‘@int32’. This directory must be placed in a directory which is on the MATLAB path but do not add ‘@int32’ to the MATLAB path. This will give you the feature of multiplying two ‘int32’ matrices.

This code has been written only as an example for your use and is not supported by the MathWorks.

Best Answer

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