# Tagged Questions

Questions on the use of numerical functions NIntegrate and NDSolve.

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### More issues Integrate, NIntegrate, FindRoot

I'm trying to solve a system of 3 non-linear equations using FindRoot and Integrate. If I start FindRoot[] close to the right answer, it works well but returns a bunch of error messages first. ...
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### Integration of a function of interpolating functions

I need to calculate the integral of a function of interpolating functions. Being more specific, the function I want to integrate is the following ...
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### NDSolve for complex variables

I am trying to simulate a multiple pendulum system with damping as follows: ...
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### Why MMA is not able to solve this problem? [closed]

I am running these following code in Mathematica. But, MMA does not output anything. It is giving me an message as "The integrand .... has evaluated to non-numerical values for all sampling points in ...
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### Mathematica9: NDSolve slows down after repeated calls

Bug introduced in 9.0 or earlier and persisting through 10.4.1 or later I have noted that in Mathematica 9 my code, which involves a lot of calls to NDSolve, ...
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### ParametricPlot3D shows an empty box

I'm trying to visualize numerical solution of 4 differential equations (these are the coordinates of a wave function in a quantum mechanical system): ...
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### NDSolve giving the wrong solution?

I'm considering the non-linear second order ODE DE $=0$, with DE given by ...
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### Numerical integration and interpolation with free parameters [closed]

I hope you'll be able to give me a hand on my question, I'm stuck and don't know how to make it work. First of all, I have a table of data pairs (x,f): ...
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### What method does NIntegrate use by default?

There is a variety of algorithms for performing numerical integration (See wiki). What method does NIntegrate use by default? I looked at the documentation page ...
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### Negative numerical result when integrating a strictly non-negative integrand

Although there are similar posts here Negative integral of a positive function , Positive integrand giving negative answer , my case is even more surprising. I have a very simple function ...
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### Definite Integral. Perfomance problem

I have a notebook in Mathematica 4. I'm trying to convert it to use in Mathematica 9. One of the problem is the long computation of definite integral. In Mathematica 4 the result of the following code ...
I would like to solve the following iterative integral equation in order to find the functional form of $P_{0}(k)$ numerically and then use it subsequently for the rest of my code: ...