# Questions tagged [equation-solving]

Questions on the analytic and numerical equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).

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### NIntegrate in FindRoot: s=S is not a valid limit of integration

I get an error code saying that "s=S is not a valid limit of integration" when I use the following code: ...
30 views

### Long computation time for solving two algebraic expressions

I am having two equations algebraic equations in two variables and 12 parameters However, the Solve command is failing to provide any result even after running it for 5 hours. How much time should I ...
30 views

### How to find the distances between two adjacent maxima in a solution from NDSolve

I try to find a general approach to plot the time evolution of horizontal distances from maximum to maximum in a solution of PDE. The solution u[x,t] normally have ...
41 views

### Need help with ParametricNDSolveValue for ODE with two variables and Do-loop

I' m trying to solve a tricky 2-nd order ODE with ParametricNDSolveValue for boundary conditions (BCs) Y = 0 at 1.6 and ...
45 views

### how to solve the equation

I want to sole the given equation for x. Can anyone help me please to analyse the solution. Thanks ...
98 views

### Solving 5 nonlinear equations, is there a suitable way?

I'm trying to solve a set of 5 nonlinear equations using NSolve: ...
29 views

Writing: ...
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### Need help with ContourPlot3D

I need to print out the value of x, y, and z when h==0, g==0. Help please? ...
85 views

### Solve giving solution when there is no solution

I got a strange result from Solve. I have the following relations: ...
34 views

### Getting an analytical form $f(x,y)$ from numerical solutions of a ContourPlot

I numerically solved a set of equations which yields a solution of the form $f(x,y)=c$. I was hoping to obtain an analytic expression for $f(x,y)=1$ (in my case $c=1$) but all I managed to do was to ...
104 views

### Solve a one dimensional heat transfer problem with NDSolve

The following problem is a 1-D heat transfer conduction problem: where, I am trying to solve with NDSolve like this way: ...