insidemat()

static2 Int insidemat	(	char *	uplo,
		char *	diag,
		Int	i,
		Int	j,
		Int	m,
		Int	n,
		Int *	offset
	)

Definition at line 138 of file pdtrmr2.c.

{
  /* tests outside mxn */
  assert(j >= 0 && j < n);
  assert(i >= 0);
  if (toupper(*uplo) == 'U') {
    Int   nbline;       /* number of lines in the j_th column */
    Int   virtualnbline;        /* number of line if we were not limited by m */
    *offset = 0;
    virtualnbline = max(m - n, 0) + j + (toupper(*diag) == 'N');
    nbline = min(virtualnbline, m);
    return nbline - i;
  } else {
    Int   firstline;    /* first line in the j_th column */
    Int   diagcol;      /* column where the diag begin */
    Int   virtualline;  /* virtual first line if the matrix was extended with
                         * negative indices */
    Int   off;
    diagcol = max(n - m, 0);;
    virtualline = j - diagcol + (toupper(*diag) == 'U');
    firstline = max(0, virtualline);
    off = max(firstline - i, 0);
    *offset = off;
    i += off;
    return m - i;
  }
}/* insidemat() */

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