[SciPy-Dev] Code review for trapz update
Alan G Isaac
alan.isaac at gmail.com
Tue Mar 10 10:03:08 EDT 2015
On 3/10/2015 8:37 AM, fizyxnrd wrote:
> This data should integrate to positive "area", even though the x data is
> decreasing (and we have negative intervals):
> x = [5, 4, 3, 2, 1]
> y = [2, 2, 2, 2, 2]
> (currently, get -8, but should get +8).
I still don't get it.
Why are you claiming the sign is currently wrong?
$\int_{5}^{1} 2 dx = |_5^1 2x = 2 - 10 = -8$.
Why would we not want `trapz` to embody the core property
of integrals that $\int_a^b f(x) dx = - \int_b^a f(x) dx$?
Alan Isaac
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