[Marsbar-users] Creating ROIs using getdata() vs '&'

[jayhegde <he...@um...>]

Hi,
     I like using both getdata () and the & operation for creating ROIs,
depending on the output I want.  But I'm having trouble understanding how
they work -- specifically, why they produce different ROIs in the following
case:
     
     I have a binarized ROI ('myroi') of type maroi_matrix.  I have a T
contrast image 'spmT_0001.img'.
I read in the contrast image and convert it to an maroi_matrix object,
'act_roi'.  The 'spmT_0001.img' and 'act_roi are otherwise identical;
neither is binarized.

        newroi1 = myroi & act_roi;
        newroi2 = getdata(myroi, spmT_0001.img);

     I expect newroi1 and newroi2 to be identical, but they're not.  Why is
this?
     Thank you very much,
     Jay
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