--- /dev/null
+#include "clapack.h"
+
+/* Subroutine */ int spotri_(char *uplo, integer *n, real *a, integer *lda,
+ integer *info)
+{
+ /* System generated locals */
+ integer a_dim1, a_offset, i__1;
+
+ /* Local variables */
+ extern logical lsame_(char *, char *);
+ extern /* Subroutine */ int xerbla_(char *, integer *), slauum_(
+ char *, integer *, real *, integer *, integer *), strtri_(
+ char *, char *, integer *, real *, integer *, integer *);
+
+
+/* -- LAPACK routine (version 3.1) -- */
+/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/* November 2006 */
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* SPOTRI computes the inverse of a real symmetric positive definite */
+/* matrix A using the Cholesky factorization A = U**T*U or A = L*L**T */
+/* computed by SPOTRF. */
+
+/* Arguments */
+/* ========= */
+
+/* UPLO (input) CHARACTER*1 */
+/* = 'U': Upper triangle of A is stored; */
+/* = 'L': Lower triangle of A is stored. */
+
+/* N (input) INTEGER */
+/* The order of the matrix A. N >= 0. */
+
+/* A (input/output) REAL array, dimension (LDA,N) */
+/* On entry, the triangular factor U or L from the Cholesky */
+/* factorization A = U**T*U or A = L*L**T, as computed by */
+/* SPOTRF. */
+/* On exit, the upper or lower triangle of the (symmetric) */
+/* inverse of A, overwriting the input factor U or L. */
+
+/* LDA (input) INTEGER */
+/* The leading dimension of the array A. LDA >= max(1,N). */
+
+/* INFO (output) INTEGER */
+/* = 0: successful exit */
+/* < 0: if INFO = -i, the i-th argument had an illegal value */
+/* > 0: if INFO = i, the (i,i) element of the factor U or L is */
+/* zero, and the inverse could not be computed. */
+
+/* ===================================================================== */
+
+/* .. External Functions .. */
+/* .. */
+/* .. External Subroutines .. */
+/* .. */
+/* .. Intrinsic Functions .. */
+/* .. */
+/* .. Executable Statements .. */
+
+/* Test the input parameters. */
+
+ /* Parameter adjustments */
+ a_dim1 = *lda;
+ a_offset = 1 + a_dim1;
+ a -= a_offset;
+
+ /* Function Body */
+ *info = 0;
+ if (! lsame_(uplo, "U") && ! lsame_(uplo, "L")) {
+ *info = -1;
+ } else if (*n < 0) {
+ *info = -2;
+ } else if (*lda < max(1,*n)) {
+ *info = -4;
+ }
+ if (*info != 0) {
+ i__1 = -(*info);
+ xerbla_("SPOTRI", &i__1);
+ return 0;
+ }
+
+/* Quick return if possible */
+
+ if (*n == 0) {
+ return 0;
+ }
+
+/* Invert the triangular Cholesky factor U or L. */
+
+ strtri_(uplo, "Non-unit", n, &a[a_offset], lda, info);
+ if (*info > 0) {
+ return 0;
+ }
+
+/* Form inv(U)*inv(U)' or inv(L)'*inv(L). */
+
+ slauum_(uplo, n, &a[a_offset], lda, info);
+
+ return 0;
+
+/* End of SPOTRI */
+
+} /* spotri_ */