[pstricks] Suggestions for \psPrintValue
Michael Sharpe
msharpe at ucsd.edu
Wed Apr 29 00:07:43 CEST 2009
On Apr 28, 2009, at 10:34 AM, Buddy Ledger wrote:
>>> / This version changes two things. First, it now adds decplaces as a
> />>/ keyword to set the number of decimal places in the output.
> Second, if
> />>/ decplaces=-1, it returns all precision in the input. Eg,
> />>/ \fmtnum[decplaces=-1]{12.675E-002} outputs 0.12675.
>
> Micheal,
>
> Using your code as a guide I wrote the macro below. It uses the fp
> package
> for the heavy lifting. I am having trouble with spaces in the
> output, I've tryed using \ignorespaces with no luck. If you have
> any ideas about how to fix it, I'd appreciate it.
>
> I wrote this to convert #.####### or ///#.#####E#// /-> #.##E# or
> #.##x10^# or #.##
> /
Buddy,
I think the main reason for the out-of control spacing is that your
code (in \GetNum) was not written defensively enough. Unless you end
each line with % (except when assigning a count or a dimension, which
requires a little more care), you are likely to introduce space
characters in unexpected places. Most pstricks functions have built-in
safeguards so that spaces do not break pictures, but it can be a
problem with ordinary TeX commands such definitions used within some
environments, such as tabular. For example,
\def\a{a} \def\b{b}
is equivalent to
\def\a{a}
\def\b{b}
(only EOL character between them) and leaves a space character in the
stream.
The correct form is
\def\a{a}\def\b{b}
or equivalently
\def\a{a}%
\def\b{b}
I've not always had good luck with the fp package, but it seems to
work fine here.
Michael
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