integration and differentation

[ChrisRaven]

Hi,
is it possible to add integrals and differentials to the library?
Or maybe it already is added, but I didn't spot it.

[josdejong]

This is indeed not implemented. Would be a great addition.

[BigFav]

If I were to start working on this, where specifically should I be looking? Should I be making a transform?

[josdejong]

This would be awesome :)

Please implement this in the v2 branch, merging from develop would be painful. Maybe the best place for these new functions is in /lib/expression/function or a subfolder there.

I think you can develop these functions in two steps:

• First make a low level function which accepts a Node tree as input. On this node tree you can do manipulations, maybe using methods like Node.transform.
• For use in expressions you could create a transform on top of this low level function which uses custom argument parsing, so you get a node tree as input.

[FSMaxB]

It's not clear to me if you are talking about numeric integration or algebraic integration.

[josdejong]

@BigFav you where thinking about algebraic integration right?

[rjbaucells]

In case numeric derivative is needed I have already implemented it on my derivative branch. I worked on it some time ago but I never found the time to create all the needed tests.

[BigFav]

I was only thinking about working on algebraic things in the parser. Nice to see some backend work was done on this, I'll note once I set some basic things up.

[harrysarson]

mathjs now has support for calculating derivatives and there is a now #442 and #1015 which look at the possibility of implementing integration. I think we can close this in favour of these other issues.

:)

[josdejong]

👍