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I want to solve a set of equations, linear, or sometimes quadratic. I don't have a specific problem, but often, I have been in this situation often.

It is simple to use wolframalpha.com, the web equivalent of Mathematica, to solve them. But that doesn't provide the comfort and convenience of an iPython shell.

Is there a simple library to work on linear and quadratic equations from a python shell?

Personally, I find it extremely convenient to use the Casio 991 MS scientific calculator. I know how to set variables, solve equations, and do a lot. I want such a tool preferably usable from within an ipython shell. I am surprised not to have found any. I'm not impressed enough by sage; perhaps I am missing something.

sympy is exactly what you're looking for.

Solving Equations, If you put a bunch of python commands in a file "mycmds.py" and do for a large collection of solution algorithms for ordinary differential equations. The function pprint does "pretty printing" of mathematical expressions to make them easier  Solving Equations Solving Equations. SymPy's solve() function can be used to solve equations and expressions that contain symbolic math variables.. Equations with one solution. A simple equation that contains one variable like x-4-2 = 0 can be solved using the SymPy's solve() function.

You discount the best answer as unacceptable.

Your question is "I want a free Computer Algebra System that I can use in Python."

The answer is "SAGE does that."

Have you looked at maxima/macsyma? SAGE provides bindings for it, and that's one of the more powerful free ones.

http://maxima.sourceforge.net/

Python Programming/Basic Math, Solve polynomial and transcendental equations. That way, some special constants, like e, pi, oo (Infinity), are treated as symbols and can be evaluated with Use simplify if you would like to transform an expression into a simpler form: >>> Brian code generation pipeline is top python math libraries solve your essential math for hine learning p math formulas and put pahesesSymbolic Maths In PythonSolving Quadratic Equation Using Python SteemitPython …

Here is how to solve your original question using Python (via Sage). This basically clarifies the remark Paul McMillan makes above.

sage: a,b,c = var('a,b,c')
sage: solve([a+b+c==1000, a^2+b^2==c^2], a,b,c)
[[a == 1000*(r1 + sqrt(r1^2 + 2000*r1 - 1000000))/(r1 + sqrt(r1^2 + 2000*r1 - 1000000) + 1000), b == -1/2*r1 - 1/2*sqrt(r1^2 + 2000*r1 - 1000000) + 500, c == r1], [a == 1000*(r2 - sqrt(r2^2 + 2000*r2 - 1000000))/(r2 - sqrt(r2^2 + 2000*r2 - 1000000) + 1000), b == -1/2*r2 + 1/2*sqrt(r2^2 + 2000*r2 - 1000000) + 500, c == r2]]

Mathematical calculations with python, Unary Arithmetic Operations. A unary mathematical expression consists of only one component or element, and in Python the plus and minus  Existe-t-il une bibliothèque simple pour travailler sur les équations linéaires et quadratiques à partir d'un shell python? personnellement, je le trouve extrêmement pratique pour utiliser la calculatrice scientifique Casio 991 MS. Je sais comment définir des variables, résoudre des équations, et faire beaucoup de choses.

For inexact solutions, read up on linear programming and sequential quadratic optimization, then search for Python libraries that performs such optimizations for you.

If the equations require integer solutions, you should search for Diophantine equation solvers for Python.

Just note that using a simple solver for Project Euler is missing the point. The fun, and educational part, is learning how to solve it yourself using primitive methods!

Solving equations with Python, do not use the polys/matrix method to solve a system of equations, solve them one single expression and single symbol that is in the expression The new approach is much simpler to implement and has better overall efficiency. Python console for SymPy 1.5.1 (Python 2.7.12) These commands were  Have another way to solve this solution? Contribute your code (and comments) through Disqus. Previous: Write a Python program to calculate a grid of hexagon coordinates of the given radius given lower-left and upper-right coordinates. The function will return a list of lists containing 6 tuples of x, y point coordinates.

Have you looked at SciPy?

It has an example in the tutorials on solving linear algebra:

http://docs.scipy.org/doc/scipy/reference/tutorial/linalg.html#solving-linear-system

3.2. Sympy : Symbolic Mathematics in Python, Statements can also be executed interactively in a Python shell. If there exists a precise mathematical description of the problem to be solved in a program, statements so that the program becomes easier to understand for humans. expression (object) to a variable (name); algorithm: detailed recipe for how to solve a  Python uses the standard order of operations as taught in Algebra and Geometry classes at high school or secondary school. That is, mathematical expressions are evaluated in the following order (memorized by many as PEMDAS), which is also applied to parentheticals. (Note that operations which share a table row are performed from left to right.

How To Do Math in Python 3 with Operators, Solving a System of Linear Equations. solving algebraic equations; describing the motion of a simple pendulum; (For instructions on how to install Python. Now that the symbols x and y are instantiated, a symbolic math expression using x and y can be created. A symbolic math expression is a combination of symbolic math variables with numbers and mathematical operators, such as +,-,/ and *. The standard Python rules for working with numbers apply in SymPy symbolic math expressions.

Solvers, Python will return a float if at least one of the numbers involved in an equation is a float. Unary Arithmetic Operations A unary mathematical expression consists of only one component or element, and in Python the plus and minus signs can be used as a single element paired with a value to return the value’s identity ( + ), or change the sign of the value ( - ).

Computing with formulas, The math module is a standard module in Python and is always available. To use mathematical functions under this module, you have to import the module using import math. It gives access to the underlying C library functions. For example, # Square root calculation import math math.sqrt(4)

Comments
  • Do you know the Maxima Language and the WxMaxima interface? I find it cozier than IPython
  • SAGE's maxima bindings can deal with pretty much anything you throw at them.
  • [200, 375, 425] is one potential solution, but there's an infinite set of solutions to this set of equations. [-499000, 999, 499001] is another. One numeric solution is probably not what the OP is looking for.
  • This answer is not relevant since the question is specific Python. The comment about infinite solutions isn't either since the problem that this question refers to (Project Euler 9) has constraints and specifically limits its solution to a single tuple.
  • It's impolite to answer your own question with a duplicate of answers provided by others, and then to accept your own answer. Instead, accept someone else's correct answer, and edit your question to include the information you found useful, or reply in a comment.
  • Paul, these points are not the primary driving force of me, nor the site, I think. Get over that obsession. People are here for sharing information.