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location Germany
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visits member for 2 years, 10 months
seen Jun 26 '13 at 15:59

I'm a retired college math teacher. I use Mathematica since version 2.2 and begun TeX with emTeX about 1990. Other languages I use are C, Perl, bash ...


Aug
6
answered Why didn't Reduce give me the right result?
Aug
1
comment Formatting a number with fixed number of significant digits
@AlexeyPopkov This case seems to work now after Update 2.
Aug
1
revised Formatting a number with fixed number of significant digits
Update II
Aug
1
revised Formatting a number with fixed number of significant digits
updated
Aug
1
answered Formatting a number with fixed number of significant digits
Jul
31
answered How to calculate scalar curvature Ricci tensor and Christoffel symbols in Mathematica?
Jul
29
answered How can I plot the direction field for a differential equation?
Jul
16
answered How can I scale tick marks without scaling my function?
Jul
13
awarded  Necromancer
Jul
13
answered setting a variable equal to the output of FindRoot
Jul
13
answered 1 Plot, 2 Scale/Axis
Jun
29
answered Replacing composite variables by a single variable
Jun
29
comment Rebinding keys to define new keyboard shortcuts
@IstvánZachar You can put a version of KeyEventTranslations.tr with your changes in $UserBaseDirectory/SystemFiles/FrontEnd/TextResources/Macintosh/ because this file is read before the KeyEventTranslations.tr` under $InstallationDirectory an so survives new Versions.
Jun
18
comment Create complicated text formulas in graphics
You may use Rowand typeset "offending" parts as strings.
Jun
14
answered Using the result of Solve in subsequent calculations
Jun
10
accepted Strange setting in FormatValues[MakeExpression]
Jun
9
comment Rationalize the Denominator by Default
If you look into the code, you'll see, that the rules are made for squareroots. I made this for teaching purposes, not to be an ever working solution.
Jun
7
answered How to draw an ellipse arc in 3D?
Jun
6
comment Numerical Integration in Laplace domain
eq3and eq4 have "n" it it, so you should use eq3[s_?NumericQ,n_?NumericQ] for these and call them in PD with 2 parameters. And you should use PD[s_]:=.... Than you can call e.g. PD[2] and get a value (0.0182218 + 0.0011354 I). But the integrals seem to convert badly, because you'll get a bunch of messages, so you can't trust this value.
Jun
6
comment Mathematica output doesn't work as input
If I type ?HypergeometricF1 I get Symbol HypergeometricF1 not found (MMa 8.0.4). So I think, you have created this symbol somewhere.