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Questions tagged [equation-solving]

763 questions
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Plasma concentration multiple doses Equations in js

Currently my app needs to calculate the plasma concentration (multiple doses). I'm expecting it to be cyclical like depicted in this case: However, when I try to calculate and plot it out, it comes out like The equation that I was told that it…
Daemedeor
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Solving a matrix equation with very small inputs

I'm programming in Matlab and in my program I need to solve a system Ax=b, where A is a m by m square matrix with very small entries. If m increases, the entries of A become smaller. A is a sparse matrix, so I rename this matrix with the function…
Hiperion
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solving trigonometric nonlinear equations using python: what am I doing wrong?

I am trying to solve a system of trigonometric equations and I think Python is not generating the right solution. Equations I am trying to solve: 1 − 2cosθ1 + 2cosθ2 − 2cosθ3 = −0.8 1 − 2cos5θ1 + 2cos5θ2 − 2cos5θ3 = 0 1 − 2cos7θ1 + 2cos7θ2 −…
Nikhil Gupta
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Solve linear system of equations with symbolic expressions

Hi I am trying to solve a linear system of equations with mathematica. I have 18 equations and 18 Unknowns and the coefficient matrix has full rank. All entries are symbolic since I am trying to solve the problem analytically. Unfortunately…
Madprofessor
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Additionally restricting scipy's root solver

I'm trying to solve a system of nonlinear equations using scipy.optimize.root() One of the equations contains a power like x[5]**epsilon, where epsilon is a parameter. For epsilon=1 I manage to find the roots, but for any different epsilon around 1,…
FooBar
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How to convert a string c# equation to an answer

I am building a WP8 app it is solving numerical analysis problems. For one step i need to parse entered function but I dont have any knowledge about parsing and I tried something else I have a stackpanel with mathematical components…
OknAkdgn
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Python/Sympy trigonometric solution of cubic equation

Can I get trigonometric symbolic solution of cubic equation using Python/Sympy? http://en.wikipedia.org/wiki/Casus_irreducibilis http://en.wikipedia.org/wiki/Cubic_function#Trigonometric_.28and_hyperbolic.29_method
denfromufa
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Solving system of equations in R

In the following system, all variables on the right hand side are known, except for w1 and w2, for which we are trying to solve. I am trying to solve this system in R, but I am not sure where to start. Also, in my real example, the system is…
Mayou
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Matlab: Solving a equation: Warning: Explicit solution could not be found

I have a equation like this: 2^n * exp((-p*k*n*(k*n-(k+1)*2^t)))/((k+1)^2*2^(2*t+1))- 1=0. I tried using the follwing code, but it gives me a warning that "Explicit solution could not be found". syms n k t p positive; S=solve(2^n *…
tap1cse
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Solve system of equations in Matlab

I want to solve a system of linear equations in Matlab. The problem is that this system will have a non-unique solution in general ( so the Nullspace is non-trivial) and this system depends on a parameter beta(non-zero!). Hence, I want to have the…
user2649077
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MATLAB symbolically solve equation for ratio of 2 variables

I have a pretty large equation in which I need to solve for a ratio of 2 variables/symbols. A small example would be: Y = A*Y + B*X and I want MATLAB to solve this as Y/X = B/(1-A) where the answer(Y/X) doesn't self-reference Y or X. Is there a way…
jerp
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Reducing an integer using Penner's easing equations

I'm making a game where you must answer a question within a time. That time reduces as your score increases. I'm doing that using this function. var getTime = function(score){ var maxTime = 5000, minTime = 750; var reducedTime = maxTime *…
Finnnn
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Solving a System of four equations (with logs) in Mathematica

I am trying to solve a system of four equations in four variables. I have read a number of threads on similar issues and tried to follow the suggestions. But I think it is a bit messy because of the logs and cross products here. This is the exact…
Divergent-Economist
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Solving equation and getting answer where two plots meet

I have two plots I created in matlab / octave I would like them to cross at x=4 or any other point on x I choose. How can I go about doing this in matlab or octave? Example code: x = linspace(0,2*pi,1000); y = 1./exp(x); % %subplot(2,1,1);…
Rick T
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Program to create equation from drawing a graph

I was wondering if anyone knows a program that could make an equation from having someone just drawing the plot. Example: I would like to just draw an image then have the program give me the equation below. Is such a thing possible? Equation given…
Rick T
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