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Hi, I want a 2d array of rows and columns filled with floating point numbers (matrix) which can be converted to a grayscale image.

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Anvinder Singh
Anvinder Singh 2016-2-25
回答： Cam Salzberger 2016-2-29
Should i use the mat2gray function of matlab ? I want to program my own image and fill it with numbers.
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Walter Roberson
Walter Roberson 2016-2-25
repmat(A,B,C) makes B vertical copies and C horizontal copies. When A is a row vector that means you would end up with B rows.
Anvinder Singh
Anvinder Singh 2016-2-25
Thanks Walter. So is it possible to use multiple loops in the same matrix to have different pixels ? I mean instead of one repmat i need multiple repmats for the same matrix A.

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Cam Salzberger
Cam Salzberger 2016-2-29
Hello Anvinder,
I understand that you are looking to display a grayscale image based on values from a matrix. As jgg said, "mat2gray" helps in ensuring that the matrix values get scaled appropriately (between 0 and 1) to display the full range in an image.
You don't need to use "repmat" to create the grayscale image, that was just an example. Here's an example that uses loops to allow for calculating each pixel value:
nRows = 10;
nCols = 15;
A = zeros(nRows,nCols);
for r = 1:nRows
for c = 1:nCols
A(r,c) = r+c/2;
end
end
I = mat2gray(A);
imshow(I)
I hope this helps!
-Cam

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