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Apr
12
comment How to numerically solve this non-standard Green's function using mathematica?
You can use DiracDelta[] in the expression. This however, is only handled correctly by DSolve, which is limited to analytically solvable differential equations. Possibly related question with good hints by Leonid Shifrin how to tackle this kind of problem: mathematica.stackexchange.com/questions/61176/…
Apr
12
awarded  Scholar
Apr
12
accepted Difference between two usages of TransformedDistribution
Apr
8
comment Difference between two usages of TransformedDistribution
oh, i see, thanks for the explanation! If you put this as an answer i would accept it! Thanks!
Apr
8
awarded  Student
Apr
8
asked Difference between two usages of TransformedDistribution
Feb
8
comment Identity Matrix in symbolic Tensor Product
For me, (IdentityMatrix[3] + (TensorProduct[a2, b1]).(TensorProduct[a1, a2])) works fine (running Mathematica 10.3/Windows), giving: {{1 + a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2, a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2, a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2}, {a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2, 1 + a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2, a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2}, {a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2, a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2, 1 + a2 \[TensorProduct] b1 . a1 \[TensorProduct] a2}}
Feb
4
comment Product of two Meijer's Function
What are the domains of $\alpha$ and $\beta$? Are there any restrictions on their values?
Feb
1
comment How to get the frequency information of an mp3 audio?
If you know for sure that there is only a single (possibly amplitude and frequency modulated) sine oscillator active (e.g. $f(t)=a(t)sin(\omega(t)),\omega(t)=\omega_0 + \int_0^t 2\pi f(s) ds$), then you can see your waveform as the real part of a complex (as in complex numbers) oscillator. You can then use a Hilbert transform (see here) to get the corresponding imaginary part of that oscillator and use this to reconstruct $a(t)$ and $f(t)$ (which is just $\frac{d\omega(t)}{dt}$).
Jan
17
awarded  Yearling
Nov
26
comment Eliminating instabilities in a transient finite element solution at a discontinuity near t = 0
@user21 Thanks for clarifying!
Nov
26
comment Eliminating instabilities in a transient finite element solution at a discontinuity near t = 0
You can always try increasing the number of points in the spatial discretization with the "MinPoints" option or try a lower "DifferenceOrder" to decrease overshooting. Method Of Lines has some details.
Nov
16
comment find the maximum number of not intersecting circles inside an ellipse
You're welcome! If i find the time, i'll try to implement an example for the Metropolis approach.
Nov
16
revised find the maximum number of not intersecting circles inside an ellipse
added 71 characters in body
Nov
16
answered find the maximum number of not intersecting circles inside an ellipse
Nov
16
comment Detecting an ellipse in a glaucoma photo
Is your question more about how to automatically find the ellipse pattern in an image? or about fitting an ellipse at a starting point in an image? or more about calculating the size of the ellipse? Please provide a minimal example.
Nov
8
awarded  Nice Answer
Nov
2
revised solve ODE with divergencies
fixed code typo
Oct
31
awarded  Good Answer
May
16
awarded  Enlightened