33,982 reputation
879179
bio website nl.linkedin.com/in/scdevries
location Utrecht, Netherlands
age
visits member for 2 years, 11 months
seen 7 hours ago

Email: "1:eJxTTMoPCpZiYGAozspPLUrRS9ZLSS0rykwtdkjPTczM0UvOzwUAvgoLoQ=="


7h
comment Can I define an axiomatic (Boolean algebra) system and prove theorems using Mathematica?
TautologyQ[([Not] (a [Or] b)) == ([Not] a [And] [Not] b), {a, b}]
18h
reviewed Reviewed How to export a vector of vectors (Mathematica 8)?
18h
comment How to export a vector of vectors (Mathematica 8)?
Or Save or DumpSave
18h
comment MinorPlanetData position
It's probably using the Internet. Many of the curated data functions like SunPosition do so and they're quite slow because of that.
20h
comment MinorPlanetData position
Did you try the "HelioCoordinates" parameter?
1d
reviewed Close Add a legend to a DiscretePlot - Version 8
1d
reviewed Close Reduce function response to a single number
1d
comment Matrix form of complex numbers
In not talking about the numbers in one matrix diagonal, but about two different matrices. As far if I know if the diagonals differ the complex numbers differ. And you still haven't given the example we asked for...
1d
reviewed Looks OK Minimizing a function with a constant $l > 0$
1d
comment Matrix form of complex numbers
If the numbers on the diagonal are different the complex number they code for is different.
1d
reviewed No Action Needed Is there any function in Wolfram Mathematica simmilar to fft.fftfreq (Python)
1d
reviewed Close Matrix form of complex numbers
1d
comment Matrix form of complex numbers
As far as I know the matrix above uniquely codes for the complex number a + b i. See, e.g., this page. Please give an example or reference of the contrary as Daniel asked.
1d
reviewed Reject Speed up calculation
1d
reviewed Reviewed 'eps' equivalent in Mathematica
2d
comment My matematica notebook dosen't work,its bring syntax error ,why?
Usually it is possible to copy quite some bits of useful code from a corrupt notebook using a simple tool as Notepad. And as to corruption: sometimes adding a } at the correct place may be all that is needed.
2d
reviewed No Action Needed Can I use Interpolating function as an input in another NDSolve?
2d
revised Unexpected result from StringReplace
deleted 3 characters in body
2d
comment FullSimplify wont simplify to expression with lower SimplifyCount
@danielj I wouldn't really know how to do that.
2d
comment FullSimplify wont simplify to expression with lower SimplifyCount
@DanielJ Exactly. You could guide Mathematica by changing the SimplifyCount to heavily tax expressions with elements that you find undesirable like powers or sines.