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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 ...


Jan
14
comment func::usage needs to be run twice?
This happens for me too, also in M9. I seems get glibberish if the usage contains super or subscripts.
Dec
13
comment some Graphics output do not fully render on the screen until an extra click is made into the notebook
On my Mac with (ATI Radeon HD 4850) I don't get the issue you describe (using V9)
Nov
2
comment Is there a way to “lock” some cells in a notebook?
@murray, nice tip. I wasn't aware of the Deletable option.
Aug
6
comment Why didn't Reduce give me the right result?
@J.M. I coudn't reproduce the first output.
Aug
1
comment Formatting a number with fixed number of significant digits
@AlexeyPopkov This case seems to work now after Update 2.
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
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
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.
May
30
comment Can styles be exported in EPS as simple text tags for use by LaTeX's psfrag?
There is a package called mathpsfrag wwwth.mpp.mpg.de/members/jgrosse/mathpsfrag
May
28
comment Strange setting in FormatValues[MakeExpression]
@Sjoerd yes I tried, but I want to avoid it, it's easy to use MakeBoxes and MakeExpression. But this is not the reason, the error/warning above shows up, because I started M. without loading any of may packages.
May
28
comment Strange setting in FormatValues[MakeExpression]
@Sjoerd But this is not may only setting, and I think to make |<stuff>| to be recognized as input, this wouldn't suffice.
May
28
comment Strange setting in FormatValues[MakeExpression]
@Sjoerd I want e.g. to print Abs[<stuff>] as |<stuff>| enclosed in \[LeftBracketingBar] and \[RightBraketinbar] in StandardForm, and I use MakeBoxes and MakeExpression for this.
May
28
comment Strange setting in FormatValues[MakeExpression]
@Sjoerd To make some output "prettier", I use FormatValues and I inspect them to see if everything is correct. BTW it seems, that the entry above does no harm, but if I spot an error/warning I´m curious where it comes from.
May
22
comment Is there a way to localize Off[some::message]?
@celtschk I use this mainly in packages, where I don't want to suppress all messages, but only those I know to be harmless in this case.
May
18
comment Flipping axis on a plot
@s0rce For me it works. Did you copy the first Line of the code Options[flippeAchsen]=Union... ?
May
9
comment Extract current viewing parameters from a 3D view?
@cormullion 1.) If you don't move, rotate, ... the grahphics with the mouse, the output will be an empty list. 2.) Yes, you have to Ctrl+Shilt+L the graphcs between the [ ]. The ll used in the definition will then be replaces by the graphic (which is a mathematica object like any other).
May
9
comment How to find the smallest root
@Artes Ok that is what we call a "weak" monotonic function.
May
9
comment How to find the smallest root
I'm a bit confused. For a monotonic, continuous, differentiable function F with supremum c all values F[t] are less then c. Or am I missing something? Could you show the definition of F?