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- 10:47moorepants commented #20049
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sylee957 on master

Updated doctrsing sections. Merge pull request #20104 from … (compare)

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@asmeurer thank you for suggesting the changes, I have made the changes in pr #18681. Can you review it

Hi all -- I'm looking at how to differentiate expressions involving IndexedBase objects. When I run the following code:

```
import sympy
n = sympy.symbols('n', integer=True)
M = sympy.IndexedBase('M', shape=(n, n))
x = sympy.IndexedBase('x', shape=n)
i = sympy.Idx('i', n)
j = sympy.Idx('j', n)
k = sympy.Idx('k', n)
energy = 0.5 * M[i, j] * x[i] * x[j]
print(sympy.simplify(energy.diff(x[k])))
```

I get an expression involving lots of Kronecker deltas. I feel it should be possible to simplify these out but I don't know how. Thoughts?

waiting for reply

Hello All, i just posted my application on the github wiki for some reviews and comments, could you please look at it? Would very much appreciate it. Thanks!

https://github.com/sympy/sympy/wiki/GSoC-2020-Application-Omar-Wagih:-Benchmarks-and-performance

https://github.com/sympy/sympy/wiki/GSoC-2020-Application-Omar-Wagih:-Benchmarks-and-performance

Hello All, i just posted my application on the github wiki for some reviews and comments, could you please look at it? Would very much appreciate it. Thanks!

Please add the links to your applications here. See, https://github.com/sympy/sympy/wiki/GSoC-2019-Current-Applications for reference.

@czgdp1807 Could you please tell me who are the potential mentors for symengine project?

I am reviewing your changes. I will put up my comments on Github.

Hi all! I have made the changes the reviewer's proposed in my pr #18875. Could you please review it?

In my PR #18881 travis has already passed on when i checked on travis offcial websote but it is showing still pending in GitHub. What could be the reason?

just a opinion the discussion related to pr should be kept there.I will also post the previous comment there.

@cod3monk

which mathematically I know to be equal to

`0.5 * (M[k, j] * x[j] + M[i, k] * x[i])`

at the very least
of course I haven't put in any assumptions about M being self-adjoint so I'm not expecting anything there

I'm not sure if there is code in sympy to simplify deltas like this yet.

it's possible there is and I am just not finding it

I would open an issue about it

Unused imports as well as for unused variables too.

@sylee957 if you're referring to #18947 ... I don't think it passed the tests

```
tests finished: 4675 passed, 1 failed, 183 skipped, 127 expected to fail,
1 expected to fail but passed, in 1238.67 seconds
DO *NOT* COMMIT!
```

btw ... Hi everyone !! ... I'm Moses and I'm new here :smile: