int main(){
Lgm_Vector a, b, z1, z2;
Lgm_SlerpInfo s;
double alpha;
a.x = 1.0; a.y = 1.0; a.z = 1.0;
b.x = 0.0; b.y = -1.0; b.z = 1.0;
Lgm_NormalizeVector( &a );
Lgm_NormalizeVector( &b );
Lgm_InitSlerp( &a, &b, &s );
alpha = 0.1;
Lgm_Slerp( &a, &b, &z1, alpha, &s );
printf("Results of slerping:\n");
Lgm_PrintVector(&a);
Lgm_PrintVector(&b);
Lgm_PrintVector(&z1);
z2.x = (1.0-alpha)*a.x + alpha*b.x;
z2.y = (1.0-alpha)*a.y + alpha*b.y;
z2.z = (1.0-alpha)*a.z + alpha*b.z;
Lgm_NormalizeVector( &z2 );
printf("Results of interpolating components (and re-normalizing):\n");
Lgm_PrintVector(&a);
Lgm_PrintVector(&b);
Lgm_PrintVector(&z2);
Lgm_VecSub(&a, &z1, &z2);
printf("\nThey are different by:\n");
Lgm_PrintVector(&a);
return(0);
}
int main(){
long int Date;
double UTC;
Lgm_Vector u, B, CurlB;
Lgm_MagModelInfo *mInfo;
int i, j;
Date = 20050831;
UTC = 9.0;
mInfo = Lgm_InitMagInfo( );
Lgm_Set_Coord_Transforms( Date, UTC, mInfo->c );
mInfo->Bfield = Lgm_B_TS04;
//mInfo->Bfield = Lgm_B_OP77;
//mInfo->Bfield = Lgm_B_T89;
mInfo->Bfield = Lgm_B_TS04;
mInfo->Bfield = Lgm_B_igrf;
mInfo->Bfield = Lgm_B_cdip;
mInfo->Bfield = Lgm_B_edip;
mInfo->Bfield = Lgm_B_T89;
mInfo->P = 4.1011111111111118;
mInfo->Dst = 7.7777777777777777;
mInfo->By = 3.7244444444444444;
mInfo->Bz = -0.12666666666666665;
mInfo->W[0] = 0.12244444444444445;
mInfo->W[1] = 0.2514;
mInfo->W[2] = 0.089266666666666661;
mInfo->W[3] = 0.047866666666666668;
mInfo->W[4] = 0.22586666666666666;
mInfo->W[5] = 1.0461333333333334;
printf("%13s", "Kp");
printf(" %13s", "Ux (Re)");
printf(" %13s", "Uy (Re)");
printf(" %13s", "Uz (Re)");
printf(" %13s", "Bx (nT)");
printf(" %13s", "By (nT)");
printf(" %13s", "Bz (nT)");
printf(" %13s", "Bmag (nT)");
printf(" %16s", "CurlB_x (nT/Re)");
printf(" %16s", "CurlB_y (nT/Re)");
printf(" %16s", "CurlB_z (nT/Re)\n");
for (i=0; i<=5; i++) {
mInfo->Kp = i;
u.x = -6.6; u.y = 0.0; u.z = 0.0;
mInfo->Bfield( &u, &B, mInfo );
Lgm_CurlB( &u, &CurlB, LGM_DERIV_SIX_POINT, 1e-3, mInfo );
printf( "%13i", mInfo->Kp);
printf( " %13g %13g %13g", u.x, u.y, u.z );
printf( " %13g %13g %13g", B.x, B.y, B.z );
printf( " %13g", Lgm_Magnitude( &B ) );
printf( " %16g %16g %16g \n", CurlB.x, CurlB.y, CurlB.z );
}
for (j=0; j<100; j++){
mInfo->Kp = 3;
for (i=0; i<13; i++) {
u.x = -1. - (double)i * 0.5;
u.y = 1.0; u.z = -1.0;
mInfo->Bfield( &u, &B, mInfo );
Lgm_CurlB( &u, &CurlB, LGM_DERIV_SIX_POINT, 1e-3, mInfo );
printf( "%13i", mInfo->Kp);
printf( " %13g %13g %13g", u.x, u.y, u.z );
printf( " %13g %13g %13g", B.x, B.y, B.z );
printf( " %13g", Lgm_Magnitude( &B ) );
printf( " %16g %16g %16g \n", CurlB.x, CurlB.y, CurlB.z );
}
}
{
Lgm_Vector v;
mInfo->Lgm_VelStep_T = 100e-3; // 100keV
mInfo->Lgm_VelStep_q = -LGM_e; // electron change
mInfo->Lgm_VelStep_E0 = LGM_Ee0; // electron mass
mInfo->Lgm_VelStep_Bm = sqrt(B.x*B.x + B.y*B.y + B.z*B.z); // b mirror [nT]
mInfo->Lgm_VelStep_h = 1e-3; // step size in Re
mInfo->Lgm_VelStep_DerivScheme = LGM_DERIV_FOUR_POINT;
printf("\nT=%lf q=%lf E0=%lf Bm=%lf h=%lf DerivScheme=%d\n",
mInfo->Lgm_VelStep_T,
mInfo->Lgm_VelStep_q, mInfo->Lgm_VelStep_E0, mInfo->Lgm_VelStep_Bm, mInfo->Lgm_VelStep_h,
mInfo->Lgm_VelStep_DerivScheme );
Lgm_GradAndCurvDriftVel(&u, &v, mInfo);
printf("\nThe drift velocity [km/s in GSM] for a locally mirroring 100 keV electron is:\n");
Lgm_PrintVector(&v);
}
Lgm_FreeMagInfo( mInfo );
exit(0);
}
int main( ) {
Lgm_CTrans *c = Lgm_init_ctrans( 0 );
Lgm_JPLephemInfo *jpl = Lgm_InitJPLephemInfo( 421, LGM_DE_SUN|LGM_DE_EARTHMOON|LGM_DE_OUTERPLANETS, 1);
Lgm_Vector Uicrf, pyResult1, pyResult2, pyResult3;
long int Date;
double UTC, JD;
Date = 20170101; // Jan 1, 2017
UTC = 12.0+0.0/60.0; // Universal Time Coordinated (in decimal hours)
pyResult1.x = 506274.15309483; //Sun (wrt solar sys barycenter)
pyResult1.y = 550063.81126863;
pyResult1.z = 213030.58611033;
pyResult2.x = -27645517.94343229; //Earth-Moon barycenter (wrt solar sys barycenter)
pyResult2.y = 133019570.59230532;
pyResult2.z = 57639804.30457275;
pyResult3.x = 1445862314.051871; //Pluto
pyResult3.y = -4400572504.816436;
pyResult3.z = -1808918123.981852;
// Set up all the necessary variables to do transformations for this Date and UTC
Lgm_Set_Coord_Transforms( Date, UTC, c );
JD = Lgm_Date_to_JD( Date, UTC, c);
Lgm_ReadJPLephem( jpl );
Lgm_JPLephem_position( JD, LGM_DE_SUN, jpl, &Uicrf);
// Test a few planets for this time
printf("DE %d\n",jpl->DEnum);
printf("Date, UTC = %8ld %lf\n", Date, UTC);
printf("JD = %lf\n", JD);
printf("Sun Position (ICRF): ");
Lgm_PrintVector(&Uicrf);
printf("Difference from expected result = %g %g %g\n\n", Uicrf.x-pyResult1.x, Uicrf.y-pyResult1.y, Uicrf.z-pyResult1.z);
Lgm_JPLephem_position( JD, LGM_DE_EARTHMOON, jpl, &Uicrf);
printf("Earth-Moon Barycenter Position (ICRF): ");
Lgm_PrintVector(&Uicrf);
printf("Difference from expected result = %g %g %g\n\n", Uicrf.x-pyResult2.x, Uicrf.y-pyResult2.y, Uicrf.z-pyResult2.z);
// Lgm_JPL_getSunVector( JD, jpl, &Uicrf);
// printf("Earth-Sun Vector: ");
// Lgm_PrintVector(&Uicrf);
Lgm_JPLephem_position( JD, LGM_DE_PLUTO, jpl, &Uicrf);
printf("Pluto Position (ICRF): ");
Lgm_PrintVector(&Uicrf);
printf("Difference from expected result = %g %g %g\n\n", Uicrf.x-pyResult3.x, Uicrf.y-pyResult3.y, Uicrf.z-pyResult3.z);
//Test Sun position for different time
Date = 19821111; // Jan 1, 2017
UTC = 11.0+0.0/60.0; // Universal Time Coordinated (in decimal hours)
pyResult1.x = 922949.0261094079; //Sun (wrt solar sys barycenter)
pyResult1.y = 1047536.3872436787;
pyResult1.z = 414153.2146306878;
Lgm_Set_Coord_Transforms( Date, UTC, c );
JD = Lgm_Date_to_JD( Date, UTC, c);
Lgm_JPLephem_position( JD, LGM_DE_SUN, jpl, &Uicrf);
printf("Date, UTC = %8ld %lf\n", Date, UTC);
printf("JD = %lf\n", JD);
printf("Sun Position (ICRF): ");
Lgm_PrintVector(&Uicrf);
printf("Difference from expected result = %g %g %g\n\n", Uicrf.x-pyResult1.x, Uicrf.y-pyResult1.y, Uicrf.z-pyResult1.z);
Lgm_free_ctrans( c ); // free the structure
Lgm_FreeJPLephemInfo( jpl ); // free the structure
return(0);
}
int main(void) {
Lgm_Vector *v, *v2;
double Lat, Lon, r, ang;
double Arr[3];
printf("Make a Vector:\n");
v = Lgm_CreateVector(1,2,3);
Lgm_PrintVector(v);
printf("Normalize it:\n");
Lgm_NormalizeVector(v);
Lgm_PrintVector(v);
printf("Force it to have a magnitude:\n");
Lgm_ForceMagnitude(v, 2);
Lgm_PrintVector(v);
printf("Set its value:\n");
Lgm_SetVecVal(v, 3);
Lgm_PrintVector(v);
printf("Set its elements:\n");
Lgm_SetVecElements(v, 1,2,3);
Lgm_PrintVector(v);
printf("Change it to spherical:\n");
Lgm_CartToSphCoords(v, &Lat, &Lon, &r);
printf("Lat:%lf Lon:%lf r:%lf\n", Lat, Lon, r);
printf("And back to Cart:\n");
Lgm_SphToCartCoords(Lat, Lon, r, v );
Lgm_PrintVector(v);
printf("Make it an array:\n");
Lgm_VecToArr(v, Arr);
printf("Arr[0]:%lf Arr[1]:%lf Arr[2]:%lf\n", Arr[0], Arr[1], Arr[2]);
printf("Edit the array and make it a vector:\n");
Arr[0] = -1;
Lgm_ArrToVec(Arr, v);
Lgm_PrintVector(v);
printf("Divide it by a scalar:\n");
Lgm_VecDivideScalar(v, 2);
Lgm_PrintVector(v);
printf("Multiply by a scalar:\n");
Lgm_VecMultiplyScalar(v, 2);
Lgm_PrintVector(v);
printf("Make a new vector and get the angle between them:\n");
v2 = Lgm_CreateVector(1,0,0);
Lgm_SetVecElements(v, 0, 1, 0);
ang = Lgm_VectorAngle(v, v2);
printf("Angle:%lf\n", ang);
printf("Make a new vector and get the angle between them:\n");
Lgm_SetVecElements(v, 0, 1, 0);
Lgm_SetVecElements(v2, 0, 1, 0);
ang = Lgm_VectorAngle(v, v2);
printf("Angle:%lf\n", ang);
Lgm_FreeVector(v);
Lgm_FreeVector(v2);
return(0);
}
