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59 lines
1.5 KiB
59 lines
1.5 KiB
/*
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* Copyright(C) 1999-2020 National Technology & Engineering Solutions
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* of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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* NTESS, the U.S. Government retains certain rights in this software.
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*
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* See packages/seacas/LICENSE for details
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*/
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#include <stdio.h> // for NULL
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void y2x(double **xvecs, /* pointer to list of x-vectors */
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int ndims, /* number of divisions to make (# xvecs) */
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int nmyvtxs, /* number of vertices I own (length xvecs) */
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double * wsqrt /* sqrt of vertex weights */
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)
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/* Convert from y to x by dividing by wsqrt. */
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{
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double *wptr; /* loops through wsqrt */
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double *xptr; /* loops through elements of a xvec */
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int i, j; /* loop counters */
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if (wsqrt == NULL) {
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return;
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}
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for (i = 1; i <= ndims; i++) {
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xptr = xvecs[i];
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wptr = wsqrt;
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for (j = nmyvtxs; j; j--) {
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*(++xptr) /= *(++wptr);
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}
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}
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}
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void x2y(double **yvecs, /* pointer to list of y-vectors */
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int ndims, /* number of divisions to make (# yvecs) */
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int nmyvtxs, /* number of vertices I own (length yvecs) */
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double * wsqrt /* sqrt of vertex weights */
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)
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/* Convert from x to y by multiplying by wsqrt. */
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{
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double *wptr; /* loops through wsqrt */
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double *yptr; /* loops through elements of a yvec */
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int i, j; /* loop counters */
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if (wsqrt == NULL) {
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return;
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}
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for (i = 1; i <= ndims; i++) {
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yptr = yvecs[i];
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wptr = wsqrt;
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for (j = nmyvtxs; j; j--) {
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*(++yptr) *= *(++wptr);
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}
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}
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}
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