MatGetRowMax — PETSc 3.21.4 documentation

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# MatGetRowMax

Gets the maximum value (of the real part) of each row of the matrix

## Synopsis

    #include "petscmat.h"
    PetscErrorCode MatGetRowMax(Mat mat, Vec v, PetscInt idx[])

Logically Collective

## Input Parameter

- mat - the matrix

## Output Parameters

- v - the vector for storing the maximums

- idx - the indices of the column found for each row (optional, otherwise pass `NULL`)

## Notes

The result of this call are the same as if one converted the matrix to dense format and found the minimum value in each row (i.e. the implicit zeros are counted as zeros).

This code is only implemented for a couple of matrix formats.

## See Also

Matrices, `Mat`, `MatGetDiagonal()`, `MatCreateSubMatrices()`, `MatCreateSubMatrix()`, `MatGetRowMaxAbs()`, `MatGetRowMin()`, `MatGetRowMinAbs()`

## Level

intermediate

## Location

src/mat/interface/matrix.c

## Implementations

MatGetRowMax_MPIAIJ() in src/mat/impls/aij/mpi/mpiaij.c
MatGetRowMax_SeqAIJ() in src/mat/impls/aij/seq/aij.c
MatGetRowMax_SeqDense() in src/mat/impls/dense/seq/dense.c

Index of all Mat routines
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Index of all manual pages