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19/20 answers
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 Nice Answer
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Aug
10
answered Replace function call with expression resulting from the symbolic evaluation of the function when defining a second function?
Aug
10
comment Determinant of a large matrix and solution of a linear equation
Possible duplicate of Find Determinant/or Row Reduce parameter dependent matrix, or of How to get the determinant and inverse of a large sparse symmetric matrix?
Aug
10
comment Is the formula $\sum _{m=1}^{n-1} \prod _{k=m+1}^n x_k x_m$ wrong in the wiki's page
A notebook on this can be downloaded from MathWorld - may require additional packages, see instructions in the source file.
Aug
10
answered Looking for feedback on this function
Aug
10
revised Axis/Angle from rotation matrix
Removed an unnecessary normalization
Aug
9
awarded  Nice Answer
Aug
9
revised Axis/Angle from rotation matrix
added 5 characters in body
Aug
9
revised Axis/Angle from rotation matrix
Speedup
Aug
8
comment How do I find the best fit?
This shouldn't be posted as an answer. It's a follow-up question. Maybe you want to edit your question instead, and post a comment to @b.gatessucks to let him know of the change.
Aug
8
comment Image Processing Mag and Phase Spectrum of Sobel, Roberts Mask
I agree the question is unclear.
Aug
8
comment Image Processing Mag and Phase Spectrum of Sobel, Roberts Mask
Looks like you understood what was being asked - I was mislead by the reference to image processing, but all it was seems to be an FT... +1
Aug
8
comment Image Processing Mag and Phase Spectrum of Sobel, Roberts Mask
What you're describing is just an application of the convolution theorem. It is made unnecessary if you do the convolution directly using ImageConvolve. What I did in my answer is equivalent to what you describe.
Aug
8
revised Image Processing Mag and Phase Spectrum of Sobel, Roberts Mask
Phase plot added
Aug
8
answered Image Processing Mag and Phase Spectrum of Sobel, Roberts Mask
Aug
7
revised Overscript distance
Added compatibility fix
Aug
7
comment Overscript distance
@Mr.Wizard Yes, that seems to cover all versions and works fine. I also just checked that it works in version 9.
Aug
7
comment Is there an analogue of the Variables command for general expressions?
The OP was looking for an analogue of Variables for polynomials, and that limits what he means by variables. But indeed, that would also include things like x[1]!
Aug
7
answered Overscript distance
Aug
7
comment Is there an analogue of the Variables command for general expressions?
I almost overlooked your answer because it's so short... but it's obviously the easiest way!
Aug
7
answered Color of a plane in Contourplot3D