# Apply a warping map to principal eigenvector?

**URL:** <https://community.mrtrix.org/t/apply-a-warping-map-to-principal-eigenvector/5220>\
**Category:** Uncategorized\
**Created:** [September 22, 2021, 3:31pm UTC](https://community.mrtrix.org/t/apply-a-warping-map-to-principal-eigenvector/5220 "2021-09-22T15:31:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Yixin\_Ma](https://community.mrtrix.org/user_avatar/community.mrtrix.org/yixin_ma/32/2696_2.png) [@Yixin\_Ma](https://community.mrtrix.org/u/Yixin_Ma)\
**Post date:** [September 22, 2021, 3:31pm UTC](https://community.mrtrix.org/t/apply-a-warping-map-to-principal-eigenvector/5220/1 "2021-09-22T15:31:40Z")

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Hi,

What would be the proper steps to warp a V1 (vector) map (from individual subject to the template) ?

Do I need to do 1) mrtransform and then 2) vectorreorient?

Cheers,

Yixin

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**Author:** ![rsmith](https://community.mrtrix.org/user_avatar/community.mrtrix.org/rsmith/32/2672_2.png) [@rsmith](https://community.mrtrix.org/u/rsmith)\
**Post date:** [October 25, 2021, 12:35pm UTC](https://community.mrtrix.org/t/apply-a-warping-map-to-principal-eigenvector/5220/2 "2021-10-25T12:35:18Z")

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Hi Yixin,

Assuming that `vectorreorient` is built upon the same logic as `fixelreorient`, where the reorientation is done in template space based on the subject → template warp field (which is defined as a pull field on the template voxel grid), you would want to follow the same sequence.

Rob