# question about mne\_read\_morph\_map

**URL:** <https://mne.discourse.group/t/question-about-mne-read-morph-map/286>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [February 18, 2011, 12:59am UTC](https://mne.discourse.group/t/question-about-mne-read-morph-map/286 "2011-02-18T00:59:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [February 18, 2011, 12:59am UTC](https://mne.discourse.group/t/question-about-mne-read-morph-map/286/1 "2011-02-18T00:59:05Z")

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Hello,

When I read the morph map between subjects A and B, it often happens that the number of vertices in the morphing matrix does not align properly with the number of vertices in the subject's surface file. For example:

[left,right] = mne\_read\_morph\_map('A','B');  
and then  
[verts,tri] = mne\_read\_surface('A\_surface-lh.white');

In some cases the length(verts) disagrees with the second dimension of left by a few vertices. When that happens, the second dimension is always smaller (from what I could tell). In such cases, should I just assume the transformation works for the first vertices of verts? Or am I missing something here?

Please let me know if you need more details.

Thanks,

Gus