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Jan
28
revised How to use Graphics@Rotate@Show@Graphics without “Graphics is not a Graphics primitive or directive.”
Formatting
Jan
28
comment Finding unit tangent, normal, and binormal vectors for a given r(t)
I can't say I've heard the term 'reper' before. My googling suggests that it's not commonly used at all.
Jan
6
awarded  Nice Question
Dec
20
comment _?NumericQ equivalent for lists
How about just: p : {_?NumericQ ..}
Dec
19
comment Drawing a torus not bounding a solid torus
I can't say I'm particularly au fait with stereographic projections, so I'm not sure what you are expecting. But the surface of your knot goes through the origin, so dividing by the norm is going to make things fly off to infinity.
Dec
19
answered How to add images where each represents a different color channel?
Dec
18
comment Evaluating a Recursive Expression
Making sure than n is an integer makes it a bit safer. Define the function with P[n_Integer, x] := .... But as acl notes, you still can't simplify before you give it a value.
Dec
16
answered Spreading colors in ListContourPlot
Dec
13
answered Revolution plot with 2 variable
Dec
13
comment Plotting Chebyshev's theta function $\vartheta(x)$
You might need some more PlotPoints in there to get rid of that wee glitch in the middle.
Dec
3
awarded  Nice Answer
Dec
2
answered Levels: how do they work?
Nov
22
comment Insert $+$, $-$, $\times$, $/$, $($, $)$ into $123456789$ to make it equal to $100$
By my back of the envelope calculation, you'd be looking at over 600 million combinations. This would take about 10 hours to run on my computer. Maybe I should try 1,2,3,4 = 10 or something.
Nov
21
answered How to create InterpolatingFunction from data?
Nov
20
comment Time approximation of decrypting RSA algorithm
Are you sure it's an exponential function? Under the possible issues for FactorInteger is the comment "Timings can increase rapidly and unpredictably with the size of the input".
Nov
20
comment Time approximation of decrypting RSA algorithm
You're hoping to extrapolate data in the range of 0 - 100 seconds up to 3 billion seconds? Sounds ambitious... Do you have a theoretical basis for the model you are fitting?
Nov
20
revised Time approximation of decrypting RSA algorithm
added 55 characters in body
Nov
19
answered How to batch rename a directory of files?
Nov
19
answered Doing an Interpolation through a list of lists into a single function
Nov
19
comment Doing an Interpolation through a list of lists into a single function
You just need to tell it what to do with the second argument: Table[interpFunct[k, x_] = Interpolation[list[[k]]][x], {k, 10}]