@brief Calculates the derivatives of the cubic basis functions.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real(kind=dp), | intent(in) | :: | r | current position for r in the grid interval |
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| real(kind=dp), | intent(in) | :: | rj_lo | left edge of the grid interval |
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| real(kind=dp), | intent(in) | :: | rj_hi | right edge of the grid interval |
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| real(kind=dp), | intent(out) | :: | dh_cubic_dr(4) | array containing the derivatives of the cubic basis functions for this grid interval |