# sympy | A computer algebra system written in pure Python

## kandi X-RAY | sympy Summary

## kandi X-RAY | sympy Summary

See the AUTHORS file for the list of authors. And many more people helped on the SymPy mailing list, reported bugs, helped organize SymPy's participation in the Google Summer of Code, the Google Highly Open Participation Contest, Google Code-In, wrote and blogged about SymPy... License: New BSD License (see the LICENSE file for details) covers all files in the sympy repository unless stated otherwise. Our mailing list is at We have a community chat at Gitter. Feel free to ask us anything there. We have a very welcoming and helpful community.

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### Top functions reviewed by kandi - BETA

- The Sine Sine .
- Gets the secant .
- The inverse hyperbolic .
- Implements the inverse constraint .
- Returns the tangent .
- The products .
- Returns the hyperbolic constraints .
- Returns a set of matrices that are matrices .
- Trinomial products .
- The product - products .

## sympy Key Features

## sympy Examples and Code Snippets

## Community Discussions

Trending Discussions on sympy

QUESTION

So... I can `sympy.integrate`

a normal distribution with mean and standard deviation:

ANSWER

Answered 2021-Jun-15 at 01:38Here's a close case that works:

QUESTION

Good morning,

I am creating an animation by connecting 6 nodes coordinates at 10 different time steps.

I start with a test: I first create a static plot for a time equal to 2 (for example) and I get the exact static plot that I am expecting: all and only the consecutive nodes are connected.

Then I create the animation. Unfortunately, the animated plot connects the nodes in the wrong way. You can see that the animation connects the consecutive nodes, but also the second and the second to last nodes.

Any idea why? Thanks

...ANSWER

Answered 2021-Jun-15 at 11:52The issue is that in your static plot, you have actually created a list of `Line2D`

objects (try printing `line1`

and you will see its not a single instance).

But, in the animation function, you just create a single `Line2D`

instance to set the `xdata`

and `ydata`

for.

We can change to creating a list of `Line2D`

instances, then loop over them and set the appropriate x and y data for each segment like so:

QUESTION

Sympy lambdify can be used to bridge functionality between numpy and sympy. However, I could not find what shortcomings exist when using lambdify. For example, I am interested in using Max with sympy and numpy:

...ANSWER

Answered 2021-Jun-11 at 16:33`help(f)`

displays:

QUESTION

ANSWER

Answered 2021-Jun-09 at 19:36Since you weren't providing the information I asked for, I tried to write a small test case, seeking to get at the core of your problem.

Mixing `numpy`

and `sympy`

is tricky and somewhat unpredictable. But sometimes `sympy`

symbols can be used in `numpy`

expressions.

QUESTION

In Python, I do some SymPy calculations that yield an array full of polynomials such as:

a*(a*(a*(a + b) + b*(a + b)) + b*(a*(a + b) + b*(a + b))) + b*(a*(a*(a + b) + b*(a + b)) + b*(a*(a + b) + b*(a + b)))

Note that this example happens to simplify to (a+b)**4, but this won't always be the case obviously. So how do I convert this expression to the following form:

c_1*a**4 + c_2*a**3*b + ... + c_n*b**4

And once I have such an expression, how would I extract the exponents c_1, ..., c_n? All I have is the .exp command, but it only works on expressions of the form a**n (i.e. no mixture of a and b and a coefficient of 1).

Any help would be majorly appreciated.

...ANSWER

Answered 2021-Jun-08 at 14:22The Poly class is useful (running with `isympy`

)

QUESTION

The following code does exactly what I want; however, the for loop is far too slow. On my machine, the wall time for the for loop is 1min 5s. I'm looking for an alternative to the for loop that is much faster.

...ANSWER

Answered 2021-Jun-08 at 02:17By breaking it into two loops, you eliminate a lot of comparison to the break point:

QUESTION

the code below is from the book "Python for Probability, Statistics, and Machine Learning. The clarification needed is for the plotting section. The problem is that "logJ" in the script is not-defined. However, the book provides this as the code to plot the graph. How do you correct (code) the plotting part of the script so it plots the output shown?

...ANSWER

Answered 2021-Jun-05 at 14:01With a couple of changes (logL to logJ, and map made into list) displays the graph:

QUESTION

I am doing some operations on two matrices in sympy and I want to record how the result was obtained. For example in a `isympy`

session:

ANSWER

Answered 2021-Jun-05 at 11:32This seems to be it:

QUESTION

I am using lcapy together with sympy and trying to process complex numbers from a circuit.

I have the following sympy expression:

...ANSWER

Answered 2021-Jun-04 at 19:13I can do (in an `isympy`

session):

QUESTION

I am getting this sympy related comparison error. Do you know how I can fix it? It doesn't seem that authors in the original repo are facing it. I see that for one of the pkl files, namely 001.pkl, the y2d is imaginary (not sure why), and is equal to `1.05147176800692e-6 + 3.72470439655723*I`

.

I am running this code: https://github.com/DirtyHarryLYL/DJ-RN/blob/master/script/generate_3D_obj_GT.py

...ANSWER

Answered 2021-Jun-04 at 16:19The root problem is that "y2d is imaginary"; SymPy is just alerting you to the fact by refusing to try do a comparison that involves a number with non-zero imaginary part. Only real numbers can be used in comparison in SymPy. (By raising the error it is letting you know that your data set has a problem.)

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

## Vulnerabilities

No vulnerabilities reported

## Install sympy

SymPy has a hard dependency on the mpmath library (version >= 0.19). You should install it first, please refer to the mpmath installation guide:.

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