From 12fef7aa53e3695c36d3650fa4fb98f991bc223e Mon Sep 17 00:00:00 2001
From: Norbert Preining <norbert@preining.info>
Date: Tue, 5 May 2020 03:00:58 +0000
Subject: CTAN sync 202005050300

---
 macros/latex/contrib/curve2e/curve2e-manual.tex | 40 ++++++++++++++++---------
 1 file changed, 26 insertions(+), 14 deletions(-)

(limited to 'macros/latex/contrib/curve2e/curve2e-manual.tex')

diff --git a/macros/latex/contrib/curve2e/curve2e-manual.tex b/macros/latex/contrib/curve2e/curve2e-manual.tex
index 23a35a8f85..87961a4cd9 100644
--- a/macros/latex/contrib/curve2e/curve2e-manual.tex
+++ b/macros/latex/contrib/curve2e/curve2e-manual.tex
@@ -1279,7 +1279,7 @@ Remember to delete all these subfolders if you decide to install a complete upda
 \multiput(50,50)(-15:5){11}{\polygon*(-1,-1)(1,-1)(1,1)(-1,1)}
 \end{picture}
 \end{minipage}
-\caption{Some examples of the \meta{handler} optional argument}%\label{pag:multiput}
+\caption{Some examples of the \meta{handler} optional argument}\label{pag:multiput}
 \end{figure}
 
  A new command |\xmultiput| (not available with the previous versions
@@ -1331,14 +1331,14 @@ Remember to delete all these subfolders if you decide to install a complete upda
 \end{figure}
  
  \item This implementation of \pack{curve2e} includes an extension
- to package |xfp|, in the sense that adds two more L3 commands:
- |\fptest| and |\fpdowhile| to the two already contained and
+ to package |xfp|, in the sense that adds three more L3 commands:
+ |\fptest|, |\fpdowhile|, |fpwhiledo| to the two already contained and
  documented  in the latter package. The syntax of such new commands
  is the following
   \begin{flushleft}\obeylines
   \cs{fptext}\marg{test}\marg{true}\marg{false}
-  and
   \cs{fpdowhile}\meta{test}\meta{operations to be repeated}
+  \cs{fpwhiledo}\meta{test}\meta{operations to be repeated}
   \end{flushleft}
  The macro |\fptest| requires two further arguments that contain
  what to do if the \meta{test} is true, and what  to do if the
@@ -1346,20 +1346,32 @@ Remember to delete all these subfolders if you decide to install a complete upda
  The \meta{test} is a logical expressions that connects math relation
  expressions, even floating point ones, by means of \emph{logical
  operators}; such operators are \verb+||+, \verb|&&|, and \verb|!|,
- respectively for OR, AND, NOT; for example \verb|!<| means “not lower
- than”, which is equivalent to “equal or grater than”. The logical
- expression is parsed left to right and normal parentheses may be
- used to alter this sequence. The logical operators work also
- between logical variables, therefore the \meta{test} may contain
- an interesting mixture of relation and logical operators.
-
- Before using |\fpdowhile| the arguments the \meta{test} depends
- from must be set so that the test is true; during the execution
+ respectively for OR, AND, NOT; math relation expressions contain
+ relation operators, even negated ones: for example \verb|!<| means 
+ “not lower than”, which is equivalent to “equal or grater than”, i.e. 
+ \verb|=>|. The logical expression is parsed left to right and normal 
+ parentheses may be used to alter this sequence. The logical operators 
+ work also between logical variables, therefore the \meta{test} may 
+ contain an interesting mixture of relation and logical operators.
+
+ Before using |\fpdowhile| and |\fpwhiledo|the arguments of \meta{test} 
+ depends on must be set so that the test is true; during the execution
  of the \meta{operations to be repeated} there must be some setting
  that eventually renders the \meta{test} false. The user should
- pay attention to set the elements that \meta{test} depends from,
+ pay attention to set the elements that \meta{test} depends on,
  because the risk is to enter an infinite loop and end up with some
  error message stating that the working memory of the program is full.
+ Notice that |\fpdowhile| first puts the \meta{operations to be repeated} 
+ into the work flow then checks the \meta{test} and possibly repeats the 
+ cycle; on the opposite, |\fpwhiledo| first checks the \meta{test} then 
+ possibly inserts the \meta{operations to be repeated} and cycles. 
+ Evidently with the same \meta{test} the two while cycles produce 
+ different results with a little, but important difference: if the input 
+ data are macros defined by previous computations, there is no guarantee 
+ that the \meta{test} is initially true; if  it sis false, |fpwhiledo| 
+ does not do anything, while |\fpdowhile| executes one cycle and produces 
+ in the output stream something that might be nonsense. While cycles done 
+ with |\fpwhiledo| should be safer and should be preferred.
  
  Nevertheless such commands are very useful also for drawing graphics;
  the |xmultiput| already makes use of such L3~functions.
-- 
cgit v1.2.3

