https://www.cnblogs.com/zgyc/p/6277562.html
SymPy is completely written in Python and does not require external libraries
principle:
Simply use the built-in arithmetic and language variables to address is, find the result by the value. Such as:
print (x + y) # being given
In the above formula x and y before this statement you definitely have to execute the assignment, otherwise it will go wrong.
The different symbolic computation, before you can set it to sign.
Symbol x = ( 'x') y = Symbol ( 'y') print (x + y)
The code is possible. Because Sympy library x and y converted into symbols (conceptually). After the introduction, you should know a little bit, through the following presentation, you will be more aware
Step 1: Install SymPy library
Environmental linux installation command: sudo pip install sympy
windows environment installation command: pip install sympy
Step two: linear equations solution functions to achieve
Function mainly by solution of the equation in the solve function sympy
Example Title: 3x + 5y = 19
4x-3y = 6
Equation notation:
from sympy import *
x = symbol('x')
y = symblo('y')
------------------------------#或
from sympy import *
x,y = symbols('x y')
The code represents the handwriting is still a difference, commonly listed below:
- Plus +
- Minus -
- Division sign /
- Multiplication sign *
- index**
- Log log ()
- e power exponent exp ()
For a long expression, if in doubt, add parentheses
Expression can be expressed as in the example: 3 * x + 5 * Y - 19 = 0
4 * x - 3 * - 6 = 0
Since the expression is converted into the required right is equal to 0, where the constant 19 to the left and Equation 6
Function Solution solve equations using
Prior to solve the example, we first solve a one dollar equation.
x * 9 - 6 = 0
While it is easy to work out the mouth, we use the function solve
print(solve(x * 9 - 6,x))
Solving example below:
Complete code
from Sympy import * x = symbol ( 'x') y = symbol ( 'y') print (solve ([3 * and + 5 * and - 19 4 * x - 3 * - 6], [x, y ]))
The result is {x: 3, y: 2}
Summary: The above brief introduction SymPy library, and the library with SymPy solve math problems in junior high school - linear equations, the following describes how to solve math problems more difficult - Calculus Related exercises