Revision 8a6de86e1a29c53020689dfee6c679a7b6fda78b authored by Konrad Werys on 01 November 2019, 08:16:31 UTC, committed by Konrad Werys on 01 November 2019, 08:16:31 UTC
1 parent e684d8a
lmfit_test.cpp
/*!
* \file lmfit_test.cpp
* \author Konrad Werys
* \date 2019/08/08
*/
#include "CmakeConfigForTomato.h"
#ifdef USE_LMFIT
#include "gtest/gtest.h"
#include "OxTestData.h"
#include "lmmin.h"
void evaluate_nonlin1(
const double *p, int n, const void *data, double *f, int *info )
{
f[0] = p[0]*p[0] + p[1]*p[1] - 1; /* unit circle x^2+y^2=1 */
f[1] = p[1] - p[0]*p[0]; /* standard parabola y=x^2 */
}
TEST(lmfit, example_copied_from_lmfit_code) {
bool verbose = false;
int n = 2; /* dimension of the problem */
double p[2]; /* parameter vector p=(x,y) */
/* auxiliary parameters */
lm_control_struct control = lm_control_double;
lm_status_struct status;
if (verbose) {
control.verbosity = 3;
}
p[0] = 2;
p[1] = 2;
/* the minimization */
if (verbose) {
printf("Minimization:\n");
}
lmmin(n, p, n, NULL, NULL, evaluate_nonlin1, &control, &status);
if (verbose) {
/* print results */
printf("\n");
printf("lmmin status after %d function evaluations:\n %s\n",
status.nfev, lm_infmsg[status.outcome]);
printf("\n");
printf("Solution:\n");
printf(" x = %19.11f\n", p[0]);
printf(" y = %19.11f\n", p[1]);
printf(" d = %19.11f => ", status.fnorm);
/* convergence of lmfit is not enough to ensure validity of the solution */
if (status.fnorm >= control.ftol)
printf("not a valid solution, try other starting values\n");
else
printf("valid, though not the only solution: "
"try other starting values\n");
}
EXPECT_NEAR(p[0], 0.786, 1e-2);
EXPECT_NEAR(p[1], 0.618, 1e-2);
}
void evaluate_T1(const double *parameters, int nSamples, const void *data_void, double *residuals, int *info )
{
double A = parameters[0];
double B = parameters[1];
double T1star = parameters[2];
// casting the pointer data_void
double *data = (double*)data_void;
for (unsigned int i = 0; i < nSamples; i++) {
// decoding the data from the data_void pointer
double invTime = data[i];
double measured = data[i+nSamples];
double calculated = 0;
calculated = A - B * exp( -invTime/ T1star );
residuals[i] = calculated - measured;
}
}
TEST(lmfit, simpleT1_test) {
bool verbose = false;
typedef double TYPE;
char filePath [] = "testData/myocardium.yaml";
Ox::TestData<TYPE> testData(filePath);
int nSamples = testData.getNSamples();
// you can pass a single data pointer to lmfit models, here I use a single array
double data[14];
KWUtil::copyArrayToArray(nSamples, data, testData.getInvTimesPtr());
KWUtil::copyArrayToArray(nSamples, &data[7], testData.getSignalPtr());
int n = 3; /* dimension of the problem */
double parameters[3]; /* parameter vector p=(x,y) */
/* auxiliary parameters */
lm_control_struct control = lm_control_double;
lm_status_struct status;
if (verbose) {
control.verbosity = 3;
}
// starting point
parameters[0] = 100;
parameters[1] = 200;
parameters[2] = 1000;
/* the minimization */
if (verbose){
printf("Minimization:\n");
}
lmmin(n, parameters, nSamples, NULL, data, evaluate_T1, &control, &status);
if (verbose) {
/* print results */
printf("\n");
printf("lmmin status after %d function evaluations:\n %s\n",
status.nfev, lm_infmsg[status.outcome]);
printf("\n");
printf("Solution:\n");
printf(" x = %19.11f\n", parameters[0]);
printf(" y = %19.11f\n", parameters[1]);
printf(" y = %19.11f\n", parameters[2]);
printf(" d = %19.11f => ", status.fnorm);
/* convergence of lmfit is not enough to ensure validity of the solution */
if (status.fnorm >= control.ftol)
printf("not a valid solution, try other starting values\n");
else
printf("valid, though not the only solution: "
"try other starting values\n");
std::cout << "control.patience: " << control.patience << std::endl;
}
EXPECT_NEAR(parameters[0], testData.getResultsMolli()[0], 1e-2);
EXPECT_NEAR(parameters[1], testData.getResultsMolli()[1], 1e-2);
EXPECT_NEAR(parameters[2], testData.getResultsMolli()[2], 1e-2);
}
#endif // USE_LMFIT
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