Started Example

2025.05.02/Example/array_io.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <string.h>
+#include "array_io.h"
+
+io_status read_values_and_derivatives (
+		double * restrict X, 
+		double * restrict Y, 
+		double * restrict D, 
+		const int n, 
+		const char * restrict name
+		)
+{
+	FILE *fp;
+	if (!(fp = fopen(name, "r"))) 
+		return ERROR_OPEN;
+
+	for (int i = 0; i < n; ++i)
+		if (fscanf(fp, "%lf\t%lf\t%lf", X + i, Y + i, D + i) != 3)
+		{ fclose(fp); return ERROR_READ; }
+
+	fclose(fp);
+	return SUCCESS;
+}
+
+void print_values_and_derivatives (
+		const double * restrict X, 
+		const double * restrict Y, 
+		const double * restrict D, 
+		const int n, const int p
+		) 
+{
+	int np = (n > p ? p : n);
+
+	for (int i = 0; i < np; i++)
+		printf("f(%lf) = %lf, f`(%lf) = %lf\n", X[i], Y[i], X[i], D[i]);
+}
+