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Aug
1
comment Programming a recursive FFT with Mathematica
@Rojo, might be a dumb question, but what does ^= do?
Jun
14
comment Higher RAM handling by 32bit Mathematica
At the risk appearing condescending, but have you considered switching to a 64bit environment? If your programmes are oftentimes computationally heavy (RAM, CPU/GPU) a 32bit operating system isn't going to cut it. Is there any real hardware issue keeping you from going 64bit?
Jun
6
comment Runge-Kutta 2nd Order ODE Solver
The link I provided shows you how to numerically solve differential equations in Mathematica. You don't have to implement your own algorithm - Mathematica comes with tones of algorithms for almost everything. You don't even have to tell Mathematica which algorithm to use as it automatically chooses one if non is explicitly given.
Jun
4
comment Runge-Kutta 2nd Order ODE Solver
As far as I am concerned the type of solver (e.g. Runge Kutta, explicit Euler,...) doesn't have anything to do with rewriting an ODE of order n as n individual first order ODEs
Jun
3
comment Runge-Kutta 2nd Order ODE Solver
Have a look at reference.wolfram.com/mathematica/tutorial/…
Apr
18
comment Scan vs Map vs Apply
@Mr.Wizard Could you point me to an explanation for the syntax f ~Scan~ head[1, 2, 3]?
Apr
3
comment Given an equation with one parameter, how do I use NSolve to solve it for many values of the parameter?
Can you further explain that?
Apr
30
comment Fourier transform of sampled data
The issue is that my actual data has a sample frequency of 48000Hz and that I can't find any option to tell Fourier that.
Apr
30
comment Fourier transform of sampled data
Figured that as well just this instant. The only issue is still to incorporate the sampling frequency when using Fourier. I will change the question accordingly.
Apr
24
comment Issue with ListDensityPlot when using logarithmic scale
Added another download link that hopefully does the trick.
Apr
24
comment Issue with ListDensityPlot when using logarithmic scale
1-click-hoster aren't what they were used to be anymore... until I find another one that actually works you can try dl.dropboxusercontent.com/u/74966785/SaschaData.zip
Mar
21
comment Only perform a symbolic differentiation once
Have you tried to create a non global variable inside your function that stores the derivative? You could then use replacement rules to call upon the derivative.
Mar
21
comment Graphical representation of a moving sound source
unfortunately they want a .pdf-file and I suspect just for the sake of printing it on top of that. (And I currently don't know if the hassle of getting 3D data from Mathematica to .pdf is worth the hassle anyway, meaning that I suspect there to be some kind of quality issue, color, aliasing etc.)
Mar
21
comment Graphical representation of a moving sound source
I added a picture of the microphone arrangement. I guess they are pretty directional just due to their form factor:)
Mar
21
comment Graphical representation of a moving sound source
Looking at your graphic I came to think it would be awesome for actual presentation to print a banner with the data in 2D and then wrap it up to get a cylinder barrel of paper much like your plot. You could then stick your head in the ring and view the data in relation to its actual physical position. Sad that I don't have to present it though (it's only a report to be handed in) :)
Mar
20
comment Graphical representation of a moving sound source
I am sorry but I have to disappoint you, it's rather far off. They were just a few centimetres apart, but as illustrated in the sketch above they are positioned with a 90° offset. I have a second .wav- file obtained with a KEMAR dummy-head that I will post tomorrow if that is deemed interesting. There the amplitude difference is not as characterising as in the measurement with two standard microphones. However the time lag is more apparent as far as I can tell from just looking at it (didn't try your plot on it yet).
Mar
20
comment Graphical representation of a moving sound source
What Stefan means is that one fails to fine a definition of corr when looking at your code.
Mar
20
comment Graphical representation of a moving sound source
I found the error, there was some conflict between several files I had in the same folder.
Mar
20
comment Graphical representation of a moving sound source
If I run your code on my machine, your result isn't reproduced, any idea why that could be?
Mar
20
comment Graphical representation of a moving sound source
That is a really nice idea:)