Rescale MbyMby3 matrix, type Double

I came over an old piece of code which I would like to make work with Matlab2016a.

partw is a MbyMby3 Matrix [1729, 1729, 3], type double.

In the code the following lines generate an error message in Matlab2016a.

partw=double(rescale(partww));
partwg=rgb2gray(double(rescale(partw)));

Undefined function 'rescale' for input arguments of type 'double'.

The code should have been functional as is given the version of Matlab that was used at the time (around 2010). So I need to change the rescale function to work with the type double - assuming there is another function I should use now instead.

Regards

Answer 1

[Star Strider]

The only rescale function in the online documentation is in the Fixed Point Designer Toolbox. The one you want may be a user-written function that you’ll have to find wherever your found the code you’re using.

[Joel]

Thanks! That is a really good point. I will investigate.

I had a quick look in the archived Matlab documentation (from the Matlab versions available at around 2010), and did not come up with something new. So you are probably right.

I will accept your answer if it turns out to be the case.

[Star Strider]

My pleasure!

EDIT — If you’re working with images, and you know what the ‘rescale’ call is supposed to do, you might want to substitute an imresize call instead. (It was introduced before R2006a.)

[Joel]

Another good point, cheers!

It turned out you were correct and the code now works properly with the user defined function rescale.

[Star Strider]

My pleasure!