Questions tagged [numerical-integration]

Questions on the use of numerical functions NIntegrate and NDSolve.

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Numeric integration with symbolic boundaries

The following is a definition of a numeric integration: ...
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Encountered non-numerical value for a derivative at t == 0 when solving nonlinear differential equation [closed]

Please refer to the below code. I have developed 3 differential equations which I am attempting to solve, however I am getting an error "Encountered non-numerical value for a derivative at t == 0&...
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How can I Improve speed of 2D Fourier Transform?

I am trying to calculate this simple FT on a grid {x,y} but it tasks too long and gives me some error message even though the results are Ok. Are there other ...
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Integral of a function defined itself as a non elementary inetgral with parametric limits

Suppose I have a function $g(t)$ defined as $$g(t)=\int_0^{1-t}e^{(u^n+sin u)}du ,\quad n \in N$$. There is nothing special with the integrand ,you can replace it by any other function whose ...
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Errors appear after integration of an interpolating function

I have a little question about integration of an interpolating function. There is an error in assumptions of the integral. I have a function that was obtained with an interpolation method: ...
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How can I change the grid of numerical integration?

I'm using numerical integration for calculating some integrals which depend on two parameters. In low range of parameters I get precise results without any further option but in high range of ...
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e.g. ...
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How do I avoid the singularities during the calculation of an integral?

I face a serious problem when I try to calculate the following integral. My code is the following: ...