Peter Breitfeld

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	age	67
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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 ...

	2,581 reputation	bio	website		visits	member for	1 year, 3 months
1618 badges		location	Germany		seen	Feb 18 at 8:37

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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 `Row`and 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 `eq3`and `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?