Stack Overflow
Stack Overflow

Questions tagged [equation-solving]

763 questions
4
votes
0 answers

Solving systems of non-linear equations with two unknown coefficients a and b (scalars or vectors solutions ?)

I have systems of non-linear equations and I am looking for getting the two unknown "a" and "b" of the problem ( for the moment, I don't know if "a" and "b" could be only vectors or matrix solutions or maybe only scalars). The difficulty is that my…
user1773603
4
votes
1 answer

How do you define a second derivative in the Python GEKKO module?

I want to solve a second order differential equation with GEKKO. In the documentation there is only an example that shows you how to solve a first order equation. I can't figure out how to write the second derivative of y to make it work. This is…
Samuel
  • 41
  • 3
4
votes
1 answer

How to find the unique solution to norm(a,2)==c; when c is a scalar and a=[x abs(1/x);x+1 1/x]

I am trying to find the unique solution to the following equation using Matlab norm(a,2)=0.11 when x is a variable and a=[x abs(1/x);x+1 1/x]. b is the exact formulation of norm(a,2), which I have gained: syms x a=[x abs(1/x);x+1…
eli
  • 87
  • 5
4
votes
0 answers

Solve simultaneous equations in R with variables

I need to solve a system of four equations and solve for (Alg,Blg,C,D)..the others are simply variables. dAlg = (ab*D + a1*f1*D*Alg*Blg + a2*f2*D*Alg*C)/e1 - m1*Alg; dBlg = (f11*D*Blg)/eB - f1*Alg*Blg - mp*Blg; dC = (f22*D*C)/eC - f2*Alg*C -…
Rspacer
  • 2,369
  • 1
  • 14
  • 40
4
votes
3 answers

Solving a non-linear system of equations in Python using Newton's Method

I am trying to solve this exercise for College. I have already submitted the code bellow. However, I am not completely satisfied with it. The task is to build an implementation of Newton's method to solve the following non-linear system of…
Pedro Delfino
  • 2,421
  • 1
  • 15
  • 30
4
votes
1 answer

How to solve equations with symbolic coefficients and noncommutative variables in SymPy?

I want to solve quite simple equations with symbolic coefficients: from sympy import * a, b = symbols('a b', commutative=False) x = IndexedBase('x') basis = [a, b, a * b - b * a] el = b * a - a * b coefs = [x[k] for k in range(len(basis))] eq = el…
homocomputeris
  • 509
  • 5
  • 18
4
votes
3 answers

Visualizing Level surfaces

I'm trying to develop a level surface visualizer using this method (don't know if this is the standard method or if there's something better): 1. Take any function f(x,y,z)=k (where k is constant), and bounds for x, y, and z. Also take in two grid…
helloworld922
  • 10,801
  • 5
  • 48
  • 85
4
votes
0 answers

Sympy Solveset Multi Variable Non-Linear Solutions

I am having a bit of trouble with Sympy's solveset. I am trying to use Sympy to find a solution to an basic circuit analysis question involving three unknown resistors and two equations. I realize that I will have to guess at the value of one of the…
Foggy
  • 383
  • 2
  • 12
4
votes
1 answer

Solving a system of equation with Sympy, python2.7

I want to solve a system of equations. But I want to be able to precise the value to "get", and as a function of "what". To better understand, I take an exemple from here, wich I modfified: import sympy as sp x, y, z = sp.symbols('x, y, z') rho,…
Agape Gal'lo
  • 687
  • 4
  • 9
  • 23
4
votes
1 answer

Is there a better way to generate all equal arithmetic sequences using numbers 1 to 10?

Problem: The numbers from 1 to 10 are given. Put the equal sign(somewhere between them) and any arithmetic operator {+ - * /} so that a perfect integer equality is obtained(both the final result and the partial results must be …
Zoltan Ersek
  • 755
  • 9
  • 28
4
votes
2 answers

Finding real roots of quartic equation using ferrari's method

I am currently trying to solve a quartic equation using Ferrari's method from Wikipedia. I want to retrieve only the real roots, discarding the imaginary one. My implementation does not return the good value for real roots. I can't find the mistakes…
MiniW
  • 193
  • 13
4
votes
3 answers

Solve mixed equation in one variable

I have this equation and want to solve it for v. I tried Mathematica but it is not able to do it. Is there any software, language capable of solving it? Equation: Solve[1 + 0.0914642/v^5 - 1.87873/v^4 + 96.1878/v^2 - ( 17.3914 E^(-(0.0296/v^2))…
user3355508
  • 61
  • 2
4
votes
2 answers

scipy.optimize: faster root finding over 2D grid

I wrote some code using scipy to find the root the following equation: def equation(x, y): return (x / y) * np.log((a * x / b) + 1.0) - 2.0 * c * c with a, b, and c scalars. I have values for y on a rectangular grid (say Y, shape 300x200), and…
Jahfet
  • 279
  • 4
  • 11
4
votes
3 answers

Java calculator with multiple operations

I have the following so far which works fine. Im sure there is probably an easier way to do this but what I will need to change/alter is the top method of Matheq. The Math method does the single math operations. The it does work with any single…
itgeek25
  • 203
  • 2
  • 7
  • 18
3
votes
3 answers

Strrep not working in Matlab to make String into function

Hello I am new to MATLAB , I wanted to know how can I make my string into function . I want to access the function as a string from user in standard Matlab format (e.g exp(-10*X)-sin(pi*X)-2*tanh(X) ) Here X is the variable. Then I want to replace…
user841852
  • 197
  • 3
  • 7
  • 15
1 2 3
…
50 51