CODEWITHSUNDEEP
pythonmatlabsympysymbolic-math
User1551892
User1551892

Reputation: 3374

How to manipulate equation in Matlab or python?

I have a complicated equation which is function of several variables and I want to manipulate like this example:

y = (x + a) / z 

x = y*z - a

Is it possible to do this kind of manipulation matlab or python?

If there is possibility then please point out method or function to do this operation.

I tried following code in Sympy Shell:

x,y,z,a = symbols ('x y z a')
solve ( y = (x-a)/z, x)

I am getting following error: 

Traceback (most recent call last):
  File "<string>", line 1
SyntaxError: non-keyword arg after keyword arg

Upvotes: 0

Views: 607

Answers (2)

asmeurer
asmeurer

Reputation: 91580

SymPy is a Python library, so your SymPy code needs to be valid Python. In Python, = is the assignment operator, which is why solve ( y = (x-a)/z, x) gives a SyntaxError. See http://docs.sympy.org/latest/gotchas.html#equals-signs.

To create an equality in SymPy use Eq, like solve(Eq(y, (x - a)/z, x), or use the fact that expressions in SymPy are assumed to be equal to zero, like solve(y - (x - a)/z, x).

Upvotes: 1

Dan
Dan

Reputation: 45752

In Matlab you'd need the symbolic math toolbox (which I don't have so I can't test) and then you should be able to do use the solve function:

syms y x a z
solve(y == (x+a)/z, x)

I have NO experince with sympy but pretty sure based on the docs this is how you do it:

from sympy import solve, Poly, Eq, Function, exp
from sympy.abc import x, y, z, a
solve(y - (x+a)/z, x)

Upvotes: 2

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