MAfSubMat
Routine

float **MAfSubMat (const float *A[], int n, int m, int Nrow)
Purpose

Set up pointers to a submatrix of a matrix of float values
Description
This routine allocates an array of row pointers. These pointers access a
submatrix of a previously allocated matrix. The returned value is a pointer
to an array of pointers to the rows of the submatrix. The calling routine
can treat the returned value as a twodimensional matrix of float values.
Consider the invocation
float **A;
float **sA;
...
A = MAfAllocMat (Nrow, Ncol);
sA = MAfSubMat ((const float **) A, n, m, Nrown);
... now sA[0][0] == A[n][m]
Then sA[i][j] is a matrix of float values for 0 <= i < Nn and
0 <= j < Ncolm. The array of pointers to the submatrix should be
deallocated using the routine UTfree.
Parameters

< float **MAfSubMat

Returned pointer to array of row pointers for the submatrix

> const float *A[]

A is an array of pointers to the rows of an N by N matrix. Note that
with ANSI C, if the actual parameter is not declared to have the const
attribute, an explicit cast to (const float **) is required.

> int n

Index for the first row of the submatrix

> int m

Index for the first column of the submatrix

> int Nrow

Number of rows in the submatrix
Author / revision
P. Kabal
/ Revision 1.8 2003/05/09
See Also
MAfAllocMat,
UTfree
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