why mat2gray function isnt working in my matlab?

this is the code:

clear all

load('BrainTumors.mat');

imagesc(MRI{1});

colormap('gray')

a = mat2gray(MRI{1});

the last row isnt running and thats the error:

"Undefined function 'mat2gray' for input arguments of type 'int16'.

Error in ExecriseSolution1 (line 5)"

i was able to run this code in other computer. how do i fix it?

[Dyuman Joshi]

Do you have access to the Image Processing Toolbox for the license you are using to run this code?

[Roni]

im not sure. how can i confirm it?

[Dyuman Joshi]

See @Steven Lord's answer below.

Answer 1

[Steven Lord]

The mat2gray function is part of Image Processing Toolbox. Do you have this toolbox installed and licensed? You can check this by running the ver command and looking for a line starting with "Image Processing Toolbox" in the displayed output.

If that line does not exist you will need to install Image Processing Toolbox to use this function.

[Roni]

thank you' it helps a lot. The "Image Processing Toolbox" does not exist, how can i install it?

[Walter Roberson]

If you have a recent matlab I suggest substituting rescale()