pgfmath: Funktion gesucht, die Strings und Zahlen verarbeiten kann

Gibt es eigentlich von pgfmath (!) eine Funktion, mit etwa folgenden Eigenschaften:

Code, hier editierbar zum Übersetzen:

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\documentclass[]{article}
\usepackage{tikz}
\usepackage{array}
\begin{document}
\def\myarray{{1,0,"-1","a"}}
\foreach \i in {0,...,3}{\pgfmathparse{\myarray[\i]}$\pgfmathresult$~ }
\pgfmathsetmacro\t{"1"}
\pgfmathparse{"\t" > 0 ? "ja" : "\t"}$\pgfmathresult$ \\
\newcolumntype{B}{ >{\bfseries}l  }
\begin{tabular}{B l B  l }
in: &   \verb+\foo{a}+  & out: & $a$ ist ein String  \\
in: &   \verb+\foo{\frac32}+  & out: & $\frac32$ ist ein String  \\
in: &   \verb+\foo{-1.2}+  & out: & $-1.2$ ist negativ  \\
in: &   \verb+\foo{0}+  & out: & $0$ ist Null\\
in: &   \verb+\foo{2}+  & out: & $2$ ist positiv  \\
\end{tabular}
\end{document}
 
 
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tikz pgfmath

gefragt 20 Okt '18, 13:21

cis
9.6k●104●461●491
Akzeptiert-Rate: 29%

~~Ich glaube mit \usetikzlibrary{math} könnte das gehen.~~

(21 Okt '18, 03:43) cis

Vielleicht irgendwie damit https://tex.stackexchange.com/a/168018/46023

(21 Okt '18, 03:44) cis

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An sich kann man es so machen:

Öffne in Overleaf

Code, hier editierbar zum Übersetzen:

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\pgfmathfloatparsenumber{123.52}
\pgfmathfloattomacro{\pgfmathresult}{\F}{\M}{\E}
Flag: \F; Mantissa \M; Exponent \E
$\to$ \pgfmathfloattofixed{\pgfmathresult}  \pgfmathresult
 
 
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wobei Flag die Bedeutung hat:

Das Kommando

Öffne in Overleaf

Code, hier editierbar zum Übersetzen:

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\newcommand\foo[1]{
\pgfmathfloatparsenumber{#1}
\pgfmathfloattomacro{\pgfmathresult}{\F}{\M}{\E}
\pgfmathparse{\F==0 ? "$#1$ is zero" : (
\F==1 ? "$#1$ is positive" : (
\F==2 ? "$#1$ is negative" : (
\F==3 ? "$#1$ is a string (NaN)" : (
\F==4 ? "$\infty$" : (
\F==5 ? "$-\infty$" : ("I do not know"
))))))}\pgfmathresult}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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liefert dann

Öffne in Overleaf

Code, hier editierbar zum Übersetzen:

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\documentclass[border=3mm, varwidth]{standalone}
\usepackage{tikz, amsmath}
\usepgflibrary{fpu}
% Das braucht man scheints:
\pgfkeys{/pgf/fpu/handlers/invalid number/.code={%
  \pgfmathfloatparsenumber{3Y0.0e0]}%
  }
}
\begin{document}
$\begin{array}{c | c}
\text{Flag} & \text{Meaning} \\ \hline
0     &  0                       \\
1     &  \text{positive}    \\
2     &  \text{negative}    \\
3     &  \text{NaN}          \\
4     &  \infty                  \\
5     &  -\infty                 \\
\end{array}$
%Beispiel:
%\pgfmathfloatparsenumber{123.52}
%\pgfmathfloattomacro{\pgfmathresult}{\F}{\M}{\E}
%Flag: \F; Mantissa \M; Exponent \E
%$\to$ \pgfmathfloattofixed{\pgfmathresult}  \pgfmathresult
\newcommand\foo[1]{
\pgfmathfloatparsenumber{#1}
\pgfmathfloattomacro{\pgfmathresult}{\F}{\M}{\E}
\pgfmathparse{\F==0 ? "$#1$ is zero" : (
\F==1 ? "$#1$ is positive" : (
\F==2 ? "$#1$ is negative" : (
\F==3 ? "$#1$ is a string (NaN)" : (
\F==4 ? "$\infty$" : (
\F==5 ? "$-\infty$" : ("I do not know"
))))))}\pgfmathresult}
\foreach \Test in {1,-1,0,1.23,a,sin(30)}{\foo{\Test} \\}
Aber: % \foo{\frac32}  % error
 
 
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Permanenter link

beantwortet 21 Okt '18, 15:41

cis
9.6k●104●461●491
Akzeptiert-Rate: 29%

bearbeitet 21 Okt '18, 22:37

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tikz ×731
pgfmath ×13

gestellte Frage: 20 Okt '18, 13:21

Frage wurde gesehen: 5,270 Mal

zuletzt geändert: 21 Okt '18, 22:37

pgfmath: Funktion gesucht, die Strings und Zahlen verarbeiten kann

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