Calculates the Runge-Kutta coefficients and calculates the fourth and fifth order solutions for step i+1 based on the values at step i.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real(kind=dp), | intent(in) | :: | xi | current x value |
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| real(kind=dp), | intent(in) | :: | dh | current step size |
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| procedure(func) | :: | ax_func | function to calculate A(x) |
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| procedure(func) | :: | bx_func | function to calculate B(x) |
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| real(kind=dp), | intent(in) | :: | yi | current y value |
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| real(kind=dp), | intent(out) | :: | ysolrk4 | fourth order solution |
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| real(kind=dp), | intent(out) | :: | ysolrk5 | fifth order solution |