Tags for questions about convolution, including the Mathematica functions Convolve, DiscreteConvolve, ListConvolve, DirichletConvolve, ImageConvolve, and convolutions using Fourier, FourierTransform, or LaplaceTransform.
20
votes
3answers
655 views
How to find the center of a circular pattern?
I am writing an algorithm that finds the center of 500 x 500 pixels images coming from a live feed from a camera at 50 Hz. So it has to be quick! The images are images of an optical field which looks ...
10
votes
1answer
268 views
Sparse convolution of sparse arrays
The documentation for ListConvolve mentions that "ListConvolve works with sparse arrays", which is true. The result, however is never sparse, eg:
...
6
votes
2answers
412 views
Speed up Mathematica code involving Convolve
I'm trying to plot the averaged autocorrelation function of a random wire profile $\xi(x)$ which is build from unitsteps which are each L units long. To calculate the average I'm generating nMax ...
6
votes
2answers
606 views
Convolution with interpolated function
I have some problems to calculate in reasonable speed the convolution of an interpolated function with a Gauss function.
I have here (ExampleData.txt, alternate Pastebin link) data which I ...
6
votes
2answers
209 views
Use of Cellular Automaton or Discrete Convolution to calculate Potts Energy of a 2D Matrix
In a project of Monte Carlo Modelling of Grain Growth (Link) one of the most costly subroutines is the calculation of the Potts-Energy of an Monte Carlo Grid cell by comparing the center cell value ...
5
votes
3answers
612 views
Discrete Convolution
Ask to compute the convolution of 2 lists, I managed to do so, with what I feel is rather heavy :
Let my 2 lists be :
a = {1,2,3,4}
b = {1,1,1,1,1,1};
The below function adds 0s on each part of ...
4
votes
2answers
113 views
Error in Compiled function at runtime in spatial competition model
I just did a model of spatial competition between two species with different competitive ability & dispersal rates on a lattice with variables nrs of individuals per site. To speed it up I tried ...
2
votes
0answers
148 views
How to make 3D object smooth?
This thread considers mathematical methods here to make the 3D object smooth but this question consider how to achieve the goal of smoothing a 3D object in Mathematica.
I want to get smoother ...
1
vote
1answer
60 views
Plotting a convolution fails [closed]
i'm trying to plot a graph of a convolution and a discrete convolution, using Mathematica 8
...
1
vote
1answer
176 views
0
votes
1answer
513 views
How to plot the convolution of dirac delta series with a sine function [closed]
I am new to mathematica.
I do the convolution of dirac delta :(DiracDelta(x-10)" with "sine(t),t=0-pi". How to plot the output ? Theoretically, the full wave should appear at the location of the ...
0
votes
0answers
44 views
MATLAB-like convolution and derivation using Mathematica [duplicate]
Possible Duplicate:
Discrete Convolution
I would like to be able to convolve two functions of two variables in Mathematica, and then plot derivatives (or functions of derivatives) of the ...
