diff options
Diffstat (limited to 'graphics/pgf/base/doc/text-en/pgfmanual-en-library-fpu.tex')
-rw-r--r-- | graphics/pgf/base/doc/text-en/pgfmanual-en-library-fpu.tex | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/graphics/pgf/base/doc/text-en/pgfmanual-en-library-fpu.tex b/graphics/pgf/base/doc/text-en/pgfmanual-en-library-fpu.tex index bdc58135ef..2a46a0a2e5 100644 --- a/graphics/pgf/base/doc/text-en/pgfmanual-en-library-fpu.tex +++ b/graphics/pgf/base/doc/text-en/pgfmanual-en-library-fpu.tex @@ -21,8 +21,8 @@ \begin{pgflibrary}{fpu} The floating point unit (fpu) allows the full data range of scientific computing for use in \pgfname. Its core is the \pgfname\ math routines for - mantissa operations, leading to a reasonable trade--of between speed and - accuracy. It does not require any third--party packages or external + mantissa operations, leading to a reasonable trade-of between speed and + accuracy. It does not require any third-party packages or external programs. \end{pgflibrary} @@ -32,7 +32,7 @@ The fpu provides a replacement set of math commands which can be installed in isolated placed to achieve large data ranges at reasonable accuracy. It provides at least% - \footnote{To be more precise, the FPU's exponent is currently a 32 bit + \footnote{To be more precise, the FPU's exponent is currently a 32-bit integer. That means it supports a significantly larger data range than an IEEE double precision number -- but if a future \TeX\ version may provide low-level access to doubles, this may change.}% @@ -56,7 +56,7 @@ by \pgfname. will be replaced with |\pgfmathfloatadd| and so on. Furthermore, any number will be parsed with |\pgfmathfloatparsenumber|. % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usepgflibrary{fpu}}] \pgfkeys{/pgf/fpu} \pgfmathparse{1+1}\pgfmathresult \end{codeexample} @@ -73,7 +73,8 @@ by \pgfname. such methods as well. %-------------------------------------------------- -% \begin{codeexample}[] +% TODOsp: codeexamples: Why is this example commented? +% \begin{codeexample}[preamble={\usepgflibrary{fpu}}] % \begin{tikzpicture} % \fill[red,fpu,/pgf/fpu/scale results=1e-10] (*1.234e10,*1e10) -- (*2e10,*2e10); % \end{tikzpicture} @@ -86,7 +87,7 @@ by \pgfname. It does not hurt to call |fpu=true| or |fpu=false| multiple times. - Please note that if the |fixed point arithmetics| library of \pgfname\ will + Please note that if the |fixedpointarithmetic| library of \pgfname\ will be activated after the FPU, the FPU will be deactivated automatically. \end{key} @@ -97,7 +98,7 @@ by \pgfname. The predefined choice |float| uses the low-level format used by the FPU. This is useful for further processing inside of any library. % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usepgflibrary{fpu}}] \pgfkeys{/pgf/fpu,/pgf/fpu/output format=float} \pgfmathparse{exp(50)*42}\pgfmathresult \end{codeexample} @@ -106,7 +107,7 @@ by \pgfname. \meta{mantissa}|e|\meta{exponent}. It provides almost no computational overhead. % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usepgflibrary{fpu}}] \pgfkeys{/pgf/fpu,/pgf/fpu/output format=sci} \pgfmathparse{4.22e-8^-2}\pgfmathresult \end{codeexample} @@ -115,7 +116,7 @@ by \pgfname. highest compatibility with the \pgfname\ engine. It is activated automatically in case the FPU scales results. % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usepgflibrary{fpu}}] \pgfkeys{/pgf/fpu,/pgf/fpu/output format=fixed} \pgfmathparse{sqrt(1e-12)}\pgfmathresult \end{codeexample} @@ -151,8 +152,8 @@ by \pgfname. There are other ways to increase the data range and/or the precision of \pgfname's math parser. One of them is the |fp| package, preferable combined -with \pgfname's |fixed point arithmetic| library. The differences between the -FPU and |fp| are: +with \pgfname's |fixedpointarithmetic| library. The differences between the FPU +and |fp| are: % \begin{itemize} \item The FPU supports at least the complete IEEE double precision number @@ -357,7 +358,7 @@ Flags: \F; Mantissa \M; Exponent \E \item[5] for $-\infty$. \end{description} % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usetikzlibrary{fpu}}] \pgfmathfloatparsenumber{42} \pgfmathfloatifflags{\pgfmathresult}{0}{It's zero!}{It's not zero!} \pgfmathfloatifflags{\pgfmathresult}{1}{It's positive!}{It's not positive!} @@ -650,12 +651,12 @@ been activated -- it is sufficient to load the library. $\meta{x} \le 0$), |\pgfmathresult| will be \emph{empty}, no error message will be generated. % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usetikzlibrary{fpu}}] \pgfmathlog{1.452e-7} \pgfmathresult \end{codeexample} % -\begin{codeexample}[] +\begin{codeexample}[preamble={\usetikzlibrary{fpu}}] \pgfmathlog{6.426e+8} \pgfmathresult \end{codeexample} |