How to use this for fractional derivatives at a point? about differint HOT 10 CLOSED

The RL function is for calculating the RL derivative at every point on a function's domain. You pass in an array of function values and get an array of fractional derivatives back.

The 'RLpoint' function is for calculating the RL derivative at a specific point. You can pass in the point as the 'domain_end' parameter.

Please let me know how this goes!

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It looks like you've found an oversight in the code. I'll have to revisit this after I review Diethelm et al, since it's been a long time since I wrote this.

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I've compared the result given by your code snippet with the expected result given by

Note, this is the theoretical result when the left endpoint is 0. For exponential functions, generally a left endpoint of negative infinity is used. But in any case, this is a comparison of the results:

In the case where the left endpoint decreases to -100, the result becomes

Which is likely closer to what you're expecting.

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thanks Cooper!

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it’d be good if a couple examples of this usage could be given on the project main page, this would be confusing to a new user … ie. setting the endpoint correctly on some common function

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Hi shaunster0,
A github wiki page has been made for this repo here please let me know if that is helpful, or what you think could be improved!

And just a note WRT the wiki, the Caputo methods are only available on a fork currently, not on the main package.

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Tomorrow I will update the readme with more examples though, you're right.

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thanks, appreciate what ure doing here, this project needed a makeover … it was amazing to me that there was no good quality python library for fractional derivatives

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