MATLAB: How to convert a matrix given in range 5 to 1000 into matrix 0 to 255

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I have a matrix whose values lies in range from 5 to 1000. I want to convert it into he range of 0 to 255. please mention how to revert back to same range of 5 to 1000. please help

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round( (Matrix - 5) / (1000-5) * 255 )

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toeplitz(1:-.1:.6)

1 - abs((1:5) - (1:5)')*.1

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