add numerical recipes library

lib/nr/ansi/examples/xairy.c

@@ -0,0 +1,40 @@
+
+/* Driver for routine airy */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define NRANSI
+#include "nr.h"
+#include "nrutil.h"
+
+#define MAXSTR 80
+
+int main(void)
+{
+	char txt[MAXSTR];
+	int i,nval;
+	float ai,bi,aip,bip,x,xai,xbi,xaip,xbip;
+	FILE *fp;
+
+	if ((fp = fopen("fncval.dat","r")) == NULL)
+		nrerror("Data file fncval.dat not found\n");
+	fgets(txt,MAXSTR,fp);
+	while (strncmp(txt,"Airy Functions",14)) {
+		fgets(txt,MAXSTR,fp);
+		if (feof(fp)) nrerror("Data not found in fncval.dat\n");
+	}
+	fscanf(fp,"%d %*s",&nval);
+	printf("\n%s\n",txt);
+	printf("%5s\n%14s %16s %17s %16s\n%14s %16s %17s %16s\n",
+		"x","ai","bi","aip","bip","xai","xbi","xaip","xbip");
+	for (i=1;i<=nval;i++) {
+		fscanf(fp,"%f %f %f %f %f",&x,&ai,&bi,&aip,&bip);
+		airy(x,&xai,&xbi,&xaip,&xbip);
+		printf("%5.2f\n\t%16.6e %16.6e %16.6e %16.6e\n",x,ai,bi,aip,bip);
+		printf("\t%16.6e %16.6e %16.6e %16.6e\n",xai,xbi,xaip,xbip);
+	}
+	fclose(fp);
+	return 0;
+}
+#undef NRANSI