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/* driver for lmstr1 example. */
#include <stdio.h>
#include <math.h>
#include <minpack.h>
void fcn(int *m, int *n, double *x, double *fvec, double *fjrow, int *iflag);
int main()
{
int m, n, ldfjac, info, lwa, ipvt[3], one=1;
double tol, fnorm;
double x[3], fvec[15], fjac[9], wa[30];
m = 15;
n = 3;
/* the following starting values provide a rough fit. */
x[1] = 1.;
x[2] = 1.;
x[3] = 1.;
ldfjac = 3;
lwa = 30;
/* set tol to the square root of the machine precision.
unless high precision solutions are required,
this is the recommended setting. */
tol = sqrt(dpmpar_(&one));
lmstr1_(&fcn, &m, &n,
x, fvec, fjac, &ldfjac,
&tol, &info, ipvt, wa, &lwa);
fnorm = enorm_(&m, fvec);
printf(" FINAL L2 NORM OF THE RESIDUALS%15.7g\n\n", fnorm);
printf(" EXIT PARAMETER %10i\n\n", info);
printf(" FINAL APPROXIMATE SOLUTION\n\n%15.7g%15.7g%15.7g\n",
x[0], x[1], x[2]);
return 0;
}
void fcn(int *m, int *n, double *x, double *fvec, double *fjrow, int *iflag)
{
/* subroutine fcn for lmstr1 example. */
int i;
double tmp1, tmp2, tmp3, tmp4;
double y[15]={1.4e-1, 1.8e-1, 2.2e-1, 2.5e-1, 2.9e-1, 3.2e-1, 3.5e-1,
3.9e-1, 3.7e-1, 5.8e-1, 7.3e-1, 9.6e-1, 1.34, 2.1, 4.39};
if (*iflag < 2)
{
for (i=1; i<=15; i++)
{
tmp1=i;
tmp2 = 16-i;
tmp3 = tmp1;
if (i > 8) tmp3 = tmp2;
fvec[i-1] = y[i-1] - (x[1-1] + tmp1/(x[2-1]*tmp2 + x[3-1]*tmp3));
}
}
else
{
i = *iflag - 1;
tmp1 = i;
tmp2 = 16 - i;
tmp3 = tmp1;
if (i > 8) tmp3 = tmp2;
tmp4 = (x[2-1]*tmp2 + x[3-1]*tmp3); tmp4=tmp4*tmp4;
fjrow[1-1] = -1;
fjrow[2-1] = tmp1*tmp2/tmp4;
fjrow[3-1] = tmp1*tmp3/tmp4;
}
}
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