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add numerical recipes library

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yenru0
2025-09-12 18:55:25 +09:00
parent d4dff245bd
commit 2c75620ec9
1344 changed files with 63869 additions and 0 deletions
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23
lib/nr/ansi/recipes/jacobn.c Normal file
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void jacobn(float x, float y[], float dfdx[], float **dfdy, int n)
{
int i;
for (i=1;i<=n;i++) dfdx[i]=0.0;
dfdy[1][1] = -0.013-1000.0*y[3];
dfdy[1][2]=0.0;
dfdy[1][3] = -1000.0*y[1];
dfdy[2][1]=0.0;
dfdy[2][2] = -2500.0*y[3];
dfdy[2][3] = -2500.0*y[2];
dfdy[3][1] = -0.013-1000.0*y[3];
dfdy[3][2] = -2500.0*y[3];
dfdy[3][3] = -1000.0*y[1]-2500.0*y[2];
}
void derivs(float x, float y[], float dydx[])
{
dydx[1] = -0.013*y[1]-1000.0*y[1]*y[3];
dydx[2] = -2500.0*y[2]*y[3];
dydx[3] = -0.013*y[1]-1000.0*y[1]*y[3]-2500.0*y[2]*y[3];
}