add numerical recipes library

lib/nr/ansi/examples/xsprsin.c

@@ -0,0 +1,53 @@
+
+/* Driver for routine sprsin */
+
+#include <stdio.h>
+#define NRANSI
+#include "nr.h"
+#include "nrutil.h"
+
+#define NP 5
+#define NMAX (2*NP*NP+1)
+
+int main(void)
+{
+	unsigned long i,j,msize,*ija;
+	float **a,**aa,*sa;
+	static float ainit[NP][NP]={
+		3.0,0.0,1.0,0.0,0.0,
+		0.0,4.0,0.0,0.0,0.0,
+		0.0,7.0,5.0,9.0,0.0,
+		0.0,0.0,0.0,0.0,2.0,
+		0.0,0.0,0.0,6.0,5.0};
+
+	ija=lvector(1,NMAX);
+	sa=vector(1,NMAX);
+	aa=matrix(1,NP,1,NP);
+	a=convert_matrix(&ainit[0][0],1,NP,1,NP);
+	sprsin(a,NP,0.5,NMAX,sa,ija);
+	msize=ija[ija[1]-1]-1;
+	sa[NP+1]=0.0;
+	printf("index\tija\t\tsa\n");
+	for (i=1;i<=msize;i++) printf("%lu\t%lu\t%12.6f\n",i,ija[i],sa[i]);
+	for (i=1;i<=NP;i++) for (j=1;j<=NP;j++) aa[i][j]=0.0;
+	for (i=1;i<=NP;i++) {
+		aa[i][i]=sa[i];
+		for (j=ija[i];j<=ija[i+1]-1;j++) aa[i][ija[j]]=sa[j];
+	}
+	printf("Original Matrix\n");
+	for (i=1;i<=NP;i++) {
+		for (j=1;j<=NP;j++) printf("%5.2f\t",a[i][j]);
+		printf("\n");
+	}
+	printf("Reconstructed Matrix\n");
+	for (i=1;i<=NP;i++) {
+		for (j=1;j<=NP;j++) printf("%5.2f\t",aa[i][j]);
+		printf("\n");
+	}
+	free_convert_matrix(a,1,NP,1,NP);
+	free_matrix(aa,1,NP,1,NP);
+	free_vector(sa,1,NMAX);
+	free_lvector(ija,1,NMAX);
+	return 0;
+}
+#undef NRANSI