Say I have the following expression which I would like to integrate over the variable z from 0 to L. import sympy as sp mdot, D, R, alpha, beta, xi, mu0, q, cp, Tin, L = sp.symbols("\dot{m}, D, R...

What is the most appropriate way to express the following in SymPy: A sum over samples 'x[i]' with 'i' going from concrete 0 to symbolic 'N'. 'x[i]' itself shall be symbolic, i.e. always appear as ...

I use Mathematica for symbolic math calculations. I am planning to switch to another language. Matlab (which I use for standard computation stuff) includes this feature but I am looking at the poss...

According to wiki: In mathematics and computer science, computer algebra, also called symbolic computation or algebraic computation is a scientific area that refers to the study and developmen...

I have a problem with sympy where it won't update my values. So I'm trying to do an iterative method for solving $\sigma_x$ and when I try to put numerical values into my expression it won't update...

I want to use a Int vector as an array index. python. array = [12,45,66,34] s= Solver() x = Int('x') s.add(array[x] == 66) so the x should be 2.. how can i do it?

In sympy, I want to create a constant e.g. to represent the speed of light. Thus I initialize c with the keyword constant=True. Later I want to check, if a symbol is a constant or a variable. Unexp...

When I type import sympy as sp x = sp.Symbol('x') sp.simplify(sp.log(sp.exp(x))) I obtain log(e^x) Instead of x. I know that "there are no guarantees" on this function. Question. Is there ...

Related to a previous question: I am using Julia Symbolics package and would like to represent 5*pi symbolically. I tried the following to no avail: using Symbolics 5 * Symbolics.pi # expanded to 1...

I am looking for a way to represent a symbolic expression such as sqrt(3)*x so as to avoid sqrt(3) being calculated upfront. Sample code: using Symbolics @variables x y = sqrt(3)*x Showing y, we c...

I am trying to write a program that simplifies mathematical expressions. I have already written a parser that converts a string to a binary tree. For example (1+2)*x will become * / \ + x / \ 1...

I am new to the subject "modeling of physical systems". I read some basic literature and did some tutorials in Modelica and Simulink/Simscape. I wanted to ask you, if I understand the following con...

I have a 4x4 matrix A with rather long but simple symbolic expressions in each of its entries. About 30 different symbols are involved. By "simple" I mean that these symbols are combined using only...

I have a multivariate polynomial (which in the general case many many variables) whose coefficients list some data that I need to read off, but it doesn't seem like sympy gives a good way to do thi...

I just cannot seem to understand the difference. For me it looks like both just go through an expression and apply the chain rule.. What am I missing?

In the program below, SymPy does not seem to understand that the integrand is the derivative of a product. Is there a way to make it return u*v? import sympy x = sympy.symbols('x', real=True) u = ...

I'm doing a very simple probability calculations of getting subset of X, Y, Z from set of A-Z (with corresponding probabilities x, y, z). And because of very heavy formulas, in order to handle the...

I'm using sympy v1.0 in a Jupyter Notebook. I'm having trouble getting expression to simplify how I'd like. Here's a toy example; it does the same thing my more complicated expressions do... impor...

In SymPy, I am trying to perform a matrix multiplication and expand it afterwards. However, SymPy does not seem to support the expansion of matrix expressions. For example, here is the 4th order Ru...

Consider the following example import sympy as sy n = sy.symbols('n') A = sy.MatrixSymbol("A",n,n) B = sy.MatrixSymbol("B",n,n) C = sy.MatrixSymbol("C",n,n) M = A.inverse()*B.inverse() - A.inverse...

Suppose I have a column vector of formulae like this N = 4*k2 + 5*k3 + k1*x 7*k2 + 8*k3 + k1*y and a column vector of symbolic variables like this k = k1 k2 k3 The formulae are linear ...

As much as this may sound like a simple task, I have not encountered a way to do it though the documentation. After running an arbitrary routine (such as one of these examples, I get something lik...

I would like to obtain a symbolic expression which is the derivative of atan2(y,x), where y and x are some expressions with a variable z. Can I safely assume that diff(atan2(y,x),z) gives me what I...

I am trying to integrate over a constant function in MATLAB 2017a, but I am stuck. First of all when I integrate using the following script, I get the right output. So the script works for a x0 whi...

I know spio.loadmat does not properly load symbolic variables created in Matlab into Python. But, I am wondering if anyone here has ever tried to load such .mat files in Python using any sort of tr...