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visits member for 1 year, 5 months
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You won't see much info about me: I am a bit of a paranoid. Or at least that's what people think about me. They don't actually call me that, but I can tell from the way they stare at me.

Oh, by the way: I hate cookies, and I hate websites that won't work because they are invoking third party scripts and cookies without listing which domain should be enabled to allow for posting.


Sep
12
comment Plotting an orbit using first principles
Procedural programming is usually not the best way to go in Mathematica. I could show you how to implement the method of solution illustrated in Feynman's Lectures on Physics by using NestList. It uses position and velocities to compute the acceleration and velocities and position at subsequent instants of time. Interested?
Sep
5
comment How do you turn off the Dashed graphics directive?
Looks like a bug, but what happens if you invert Sin and Cos and the corresponding list of directives?
Sep
1
comment I can't Plot the equation -(π/4) + x - 1/2 Sin[2 x] == 0
Plot the function, not the equation! Just remove ==0 from eqn1 or use Plot[x - (Sin[2*x]/2) - (Pi/4), {x, -2, 2}] directly.
Jul
20
revised Mathematica Solve function does not solve double exponential
added 30 characters in body
Jul
17
revised No real number fitting double exponential in Mathematica
added 82 characters in body
Jul
9
comment Wavelength, wavenumber, energy and frequency in a ruler
Never used it, but by reading the documentation maybe ScalingFunction->"Reverse" could do the trick? You'll have to dispose of Table and create the list manually, I guess.
Jun
18
comment Fitting a variable using multiple equations
@OleksandrR., good point. I was not even aware there was a LeastSquare built-in function (MMA is growing larger and larger, the next manual will be a dictionary). The problem with what I call black-boxed approach is that one is tempted to overlook this sort of pitfalls, trusting the system to do the thinking. I did it with the black-box Inverse and PseudoInverseit seems :-)... But I guess that even LeastSquares and NMinimize are hiding pitfalls.
Jun
18
answered Fitting a variable using multiple equations
Jun
3
awarded  Enlightened
Jun
3
awarded  Nice Answer
Jun
1
reviewed Approve suggested edit on Evaluation indicator for a notebook
Jun
1
reviewed Approve suggested edit on Is it possible to use Begin and End inside a Manipulate?
May
18
comment Help using NIntegrate
You defined de1[phi_, curlE_] and then you called de1[curlE], which - to my knowledge - has no definition attached.
May
18
comment Help using NIntegrate
It appears de1[curlE] is missing an argument (or its definition has one in excess)
May
9
reviewed Approve suggested edit on How should my data be formatted for use with BetweennessCentrality?
Apr
29
comment Mean Squared Deviation for Population Data
Hard to tell. You should define "wrong/strange". Here I see only a portion of code, called with unknown parameters, and I have no idea what the data looks like, so I cannot tell if you just forgot a 14 in MSD = Sum[MSDSqr, {n, numberOfValues}]/14 and you find strange result because your test data is not 14 years long... Moreover, procedural style code is not the best way to do things in MMA (but I have to concede sometimes it is).
Apr
22
answered Selection of the position of the variable
Apr
16
revised Elegant operations on matrix rows and columns
added 374 characters in body
Apr
16
answered Elegant operations on matrix rows and columns
Apr
13
comment Transform elements in list from form {x_} to form {x_, 0}
@Mr.Wizard, I updated the answer accordingly. But I believe that immediate replacement can still be safely used (the code look nicer with that little arrow :-) ) by making sure the variables have unique names. This is only valid when applying the rule 'on the go'.