add a method to compute the T derivative of an NSE table quantity #1407
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this works by differentiating the cubic interpolant
maxpkatz
reviewed
Dec 17, 2023
nse_tabular/nse_table.H
Outdated
| // we take x_i to be x[1] | ||
| // then return dfdx = 3 a (x - x_i)**2 + 2 b (x - x_i) + c | ||
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| Real a = (3 * fs[1] - 3 * fs[2] + fs[3] - fs[0]) / (6 * std::pow(dx, 3)); |
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I think the integer 3 gets cast to a float in std::pow, so this will take a much slower path compared to just writing (dx * dx * dx).
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these have been switched to amrex::Math::powi(x)
yut23
approved these changes
Dec 18, 2023
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this works by differentiating the cubic interpolant