add doc

c/example/example5.c

@@ -1,8 +1,13 @@
+/*
+This is a translation of example 5 from the ODRPACK95 documentation.
+*/
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
 #include "../include/odrpack/odrpack.h"
 
+// User-supplied function for evaluating the model and its partial derivatives
 void fcn(int *n, int *m, int *np, int *nq, int *ldn, int *ldm, int *ldnp, double *beta, double *xplusd,
          int *ifixb, int *ifixx, int *ldifx, int *ideval, double *f, double *fjacb, double *fjacd, int *istop)
 {
@@ -47,12 +52,12 @@ int main()
 #define nq 1
 
     double beta[np] = {2.0, 0.5};
-    double l[np] = {0.0, 0.0};
-    double u[np] = {10.0, 0.9};
+    double lower[np] = {0.0, 0.0};
+    double upper[np] = {10.0, 0.9};
     double x[n * m] = {0.982, 1.998, 4.978, 6.01};
     double y[n * nq] = {2.7, 7.4, 148.0, 403.0};
 
-    odr_c(fcn, n, m, np, nq, beta, y, x, l, u);
+    odr_c(fcn, n, m, np, nq, beta, y, x, lower, upper);
 
     return 0;
 }