Reputation
3,857
Top tag
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
14 23
Newest
 Yearling
Impact
~141k people reached

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
May
16
awarded  Nice Answer
Jan
17
awarded  Yearling
Dec
31
awarded  Nice Answer
Aug
20
answered Choosing $n$ equidistant points on a circle with given radius and center
Jan
17
awarded  Yearling
Oct
11
revised Mathematica gives wrong result while Wolfram|Alpha is correct
flagegd as bug because `Integrate` gives incorrect results