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math

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sgsokol
sgsokol commented Sep 4, 2020

Consider the following system and its solution:

from sympy import *
from sympy.abc import j,f

# augmented matrix
a=Matrix([
[1,  1, 1,  1, 1,  1, 1,  1,  1],
[0, -1, 0, -1, 0, -1, 0, -1, -j],
[0,  0, 0,  0, 1,  1, 1,  1,  f]
])

x=Matrix(list(linsolve(a))[0])

# check if x is a solution
a[:,:-1]*x-a[:,-1] # should be all 0 but the second term is 'tau0-tau1'

Do you have an

Powerful modern math library for PHP: Features descriptive statistics and regressions; Continuous and discrete probability distributions; Linear algebra with matrices and vectors, Numerical analysis; special mathematical functions; Algebra
  • Updated Sep 29, 2020
  • PHP
geniuslittleteddy
geniuslittleteddy commented Aug 9, 2020

General information

Reading position of a long note could get lost after device orientation changes. It's annoying to manually scroll to the target position I read before.

  • App version: 2.2.10
  • System: Android 7

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