add numerical recipes library

lib/nr/ansi/examples/xrank.c

@@ -0,0 +1,57 @@
+
+/* Driver for routine rank */
+
+#include <stdio.h>
+#include <stdlib.h>
+#define NRANSI
+#include "nr.h"
+#include "nrutil.h"
+
+#define NP 100
+#define MAXSTR 80
+
+int main(void)
+{
+	char txt[MAXSTR];
+	unsigned long i,j,k,l,*indx,*irank;
+	float *a,b[11];
+	FILE *fp;
+
+	indx=lvector(1,NP);
+	irank=lvector(1,NP);
+	a=vector(1,NP);
+	if ((fp = fopen("tarray.dat","r")) == NULL)
+		nrerror("Data file tarray.dat not found\n");
+	fgets(txt,MAXSTR,fp);
+	for (i=1;i<=NP;i++) fscanf(fp,"%f",&a[i]);
+	fclose(fp);
+	indexx(NP,a,indx);
+	rank(NP,indx,irank);
+	printf("original array is:\n");
+	for (i=0;i<=9;i++) {
+		for (j=1;j<=10;j++) printf("%7.2f",a[10*i+j]);
+		printf("\n");
+	}
+	printf("table of ranks is:\n");
+	for (i=0;i<=9;i++) {
+		for (j=1;j<=10;j++) printf("%7d",irank[10*i+j]);
+		printf("\n");
+	}
+	printf("press return to continue...\n");
+	(void) getchar();
+	printf("array sorted according to rank table:\n");
+	for (i=0;i<=9;i++) {
+		for (j=1;j<=10;j++) {
+			k=10*i+j;
+			for (l=1;l<=NP;l++)
+				if (irank[l] == k) b[j]=a[l];
+		}
+		for (j=1;j<=10;j++) printf("%7.2f",b[j]);
+		printf("\n");
+	}
+	free_vector(a,1,NP);
+	free_lvector(irank,1,NP);
+	free_lvector(indx,1,NP);
+	return 0;
+}
+#undef NRANSI