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2h
revised Why does Mathematica use [[ ]] notation for array indexing?
edited tags
3h
comment How to get simultaneous eigenvectors of commuting matrices?
Any special structure (e.g. symmetry, sparseness) in your matrices?
3h
comment How I can integrate $\int_0^{a} x e^{-\frac{b^2 x^2}{2 c}} J_0(n x) dx$?
Ah, Laguerre; that one could actually be useful numerically; sometimes those series have quicker convergence than Taylor series.
4h
revised Can I rely on the ordering of the adjacency matrix?
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4h
comment OLS Estimation - Computational results vs. calculation by hand
"I'm quite sure that I didn't make any mistakes." - famous last words, that.
4h
comment OLS Estimation - Computational results vs. calculation by hand
At the very least, you have DesignMatrix[], PseudoInverse[], and LeastSquares[] for reference.
4h
revised OLS Estimation - Computational results vs. calculation by hand
edited tags
4h
revised Implicitly defined compact complicated surface
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5h
comment Implicitly defined compact complicated surface
Ah yes, that. Have you tried using e.g. the hyperspherical or Hopf parametrizations of the 3-sphere?
5h
comment Does a matrix need to be rationalized when calculating MatrixExp?
But, what you can try is to compute it at two or three different levels of precision. Agreement in those results might mean your numbers are good.
5h
comment Does a matrix need to be rationalized when calculating MatrixExp?
Depends on the matrix. Well, you did say your matrix is not normal, so the the guarantees are not as good as in the normal case.
5h
comment Does a matrix need to be rationalized when calculating MatrixExp?
Because the algorithms for exponentiation are different for inexact numbers and exact numbers.
5h
comment Having trouble translating Matlab `fsolve` into Mathematica
What exactly are you trying to do to the companion matrix of a polynomial?
5h
comment Does a matrix need to be rationalized when calculating MatrixExp?
It might take a long time, depending on how complicated are the entries of its Jordan decomposition.
9h
comment Implicitly defined compact complicated surface
…i.e., $\Im\left(z^4-(w\exp(i\theta))^3\right)=0$?
12h
comment Wavelet Transform Modulus Maxima (WTMM) method
Thanks Doc; this ought to be useful to potential answerers…
18h
revised How do I obtain the enclosed area of this particular parametric plot?
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18h
comment Calculate area from `RegionPlot` directly
Well, if you can extract the polygons, there's this.
18h
reviewed Close Displaying Greek letters with subscripts inside plot
18h
reviewed Leave Open Why does my calculation of a probability take too much time?