reading a dicom file

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Dear Matlab communite

I am trying to read a dicom file (an MRI image) using matlab and then perform a Fourier transform of the image. I have written this code {please find below}:

clear all
info = dicominfo('MR01.dcm');
Y = dicomread(info);
J=imadjust(Y,stretchlim(Y),[0 1]);
F = fftshift(fft2(fftshift(J)));

When I run the code from the m file I get this message: ??? Undefined function or variable 'dicom'. However, when I copy and paste the code in the command window the code runs well without any error. I really do not know what is the cause of the error. May someone please help me in solving this query.

Best wishes AA