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  • 5 votes cast
May
25
comment Converting code in other languages to Mathematica code
f2mma does this for simple FORTRAN programs, but I could only find references to f2mma, not the software itself (and your question doesn't mention FORTRAN, so this might be even more unhelpful).
May
25
asked Where is f2mma.zip, Fortran to Mathematica converter?
Jan
19
awarded  Teacher
Dec
14
asked Mathematica can't solve simple force-generated-by-cuboidal-planet integral?
Dec
1
comment Lists for built-in functions that can work without brackets
Pi and E and EulerGamma though you could argue these are constants (and boringly return themselves). I'd look for functions that take no arguments, though I can't imagine there are many interesting ones that aren't constants.
Nov
30
awarded  Curious
Nov
29
asked “Power series” in Cos[n*x] for X coordinate of planetary ellipse
Nov
6
accepted Integrate over piecewise function defined using /;
Nov
6
comment Integrate over piecewise function defined using /;
Thank you!!!!!!
Nov
6
comment Integrate over piecewise function defined using /;
OK, is there any "magic" way to convert one form to the other? (ie, a way that requires minimal effort on my part?)
Nov
6
comment Integrate over piecewise function defined using /;
@BobHanlon Unfortunately won't work if the integration contains variables other than x.
Nov
6
asked Integrate over piecewise function defined using /;
Nov
4
comment The speed of Sum[] varies strangely
I did your Sums on my Mathematica in a different order and got qualitatively different results. The 10^6 took a lot longer, but the 10^7 took even longer. Then, 10^8 was very quick. When using Mathematica for timing, be sure to clear caches/etc to make sure you're not getting inaccurate times. Restarting Mathematica each time might also make the timing more accurate.
Nov
1
comment Curve fitting of a list
FindSequenceFunction?
Oct
30
comment Using FindFit to return a list of possible best fits
You could try using Method->NMinimize to get a different (usually better) fit. You could try tweaking the other parameters for different types of fits (eg, different NormFunctions, perhaps straight line distance instead of y distance)
Oct
30
comment Can not understand the code to plot Fourier Series approximation of the line
I didn't see an In[9] on that page? It skips from In[8] to In[11] I believe?
Oct
30
comment Why can't I import a file in the init.m file?
I get "Import::infer: Cannot infer format of file table.csv." when I do it. Try it without the semicolon to see if spits out an error. Bizarrely, this works fine if I do it after Mathematica loads.
Oct
30
comment Series expansion of InterpolatingFunction obtained from NDSolve
Do y''[t] /. First@NDSolve[{y'[t] == y[t], y[0] == 1}, y''[t], {t, 0, 1}] and then Plot[%,{t,0,1}] and the result looks correctish (I think your t->0 is being evaluated at the wrong place)? I agree with @Eckhard too: try FindSequenceFunction or something maybe. OK, I see what happens. The function is 4+ at t=0 (PlotRange->All helped) but it becomes correct even an infinitesimal distance from t=0. That's sort of reasonable since t=0 is a boundary.
Oct
30
comment Series expansion of InterpolatingFunction obtained from NDSolve
NDSolve[{y'[t] == y[t], y[0] == 1}, y'[t], {t, 0, 1}] will solve for y'[t]. By solving for arbitrary derivatives, you might be able to use Taylor series expansion directly?
Oct
26
comment How to build a constant Graphics object
Would //InputForm help? Save plot1 as its input form? BTW, do you mean Plot3D instead of Plot above?