petsc-3.14.5 2021-03-03
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# DMPlexComputeProjection3Dto1D

Rewrite coordinates to be the 1D projection of the 3D coordinates

### Synopsis

    #include "petscdmplex.h"
    #include "petscfe.h"
    PetscErrorCode DMPlexComputeProjection3Dto1D(PetscScalar coords[], PetscReal R[])

Not collective

### Input Parameter

| coords | - The coordinates of a segment

### Output Parameters

| coords | - The new y-coordinate, and 0 for x and z
| R | - The rotation which accomplishes the projection

Note: This uses the basis completion described by Frisvad in http://www.imm.dtu.dk/~jerf/papers/abstracts/onb.html, DOI:10.1080/2165347X.2012.689606

### See Also

DMPlexComputeProjection2Dto1D(), DMPlexComputeProjection3Dto2D()

### Level

developer

### Location

src/dm/impls/plex/plexgeometry.c
Index of all DMPLEX routines
Table of Contents for all manual pages
Index of all manual pages