MatSetValues

Inserts or adds a block of values into a matrix. These values may be cached, so MatAssemblyBegin() and MatAssemblyEnd() MUST be called after all calls to MatSetValues() have been completed.

Synopsis

int MatSetValues(Mat mat,int m,int *idxm,int n,int *idxn,Scalar *v,InsertMode addv)
Not Collective

Input Parameters

mat - the matrix
v - a logically two-dimensional array of values
m, idxm - the number of rows and their global indices
n, idxn - the number of columns and their global indices
addv - either ADD_VALUES or INSERT_VALUES, where ADD_VALUES adds values to any existing entries, and INSERT_VALUES replaces existing entries with new values

Notes

By default the values, v, are row-oriented and unsorted. See MatSetOption() for other options.

Calls to MatSetValues() with the INSERT_VALUES and ADD_VALUESoptions cannot be mixed without intervening calls to the assemblyroutines.

MatSetValues() uses 0-based row and column numbers in Fortranas well as in C.

Efficiency Alert

The routine MatSetValuesBlocked() may offer much better efficiencyfor users of block sparse formats (MATSEQBAIJ and MATMPIBAIJ).

Keywords

matrix, insert, add, set, values

See Also

MatSetOption(), MatAssemblyBegin(), MatAssemblyEnd(), MatSetValuesBlocked(), MatSetValuesLocal()

Location: src/mat/interface/matrix.c
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