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corected implicit euler function

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Krishna Vedala 2020-06-11 12:40:56 -04:00
parent 39314b3cb7
commit 72c9b26a13
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1 changed files with 7 additions and 8 deletions
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numerical_methods/ode_semi_implicit_euler.c
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@ -84,17 +84,16 @@ void exact_solution(const double *x, double *y)
*/
void semi_implicit_euler_step(double dx, double *x, double *y, double *dy)
{
problem(x, y, dy);
double tmp_x = (*x) + 0.5 * dx;
double tmp_y[order];
int o;
for (o = 0; o < order; o++)
tmp_y[o] = y[o] + 0.5 * dx * dy[o];
problem(&tmp_x, tmp_y, dy);
problem(x, y, dy); // update dy once
y[0] += dx * dy[0]; // update y0
for (o = 0; o < order; o++)
y[o] += dx * dy[o];
problem(x, y, dy); // update dy once more
for (o = 1; o < order; o++)
y[o] += dx * dy[o]; // update remaining using new dy
*x += dx;
}
/**