> Am 18.04.2015 um 18:55 schrieb Otared Kavian <ota...@gmail.com>: > > Hi everyone, > > In the example below I define a macro which chooses at random a name from a > list of names. But I wonder whether this can be done in a more clever way > without using a numerical macro created with math.random in Lua. The > shortcoming of the macro below is that before hand I must know the nomber of > elements in the list of names (for instance 5 in the example below), while it > may happen that I need to create as many as random names that there are > elements in the list, but sometimes I don’t know what is this number. > > Thanks for any insight and help. > Best regards: OK > %%%% begin random-names.tex > \setuprandomize[2015] % set a seed > > \starttext > > \startluacode > Name = {'F', 'G', 'u', 'v', 'W'} > \stopluacode > > \define[3]\RandomName{% > \setevalue{Named#1}{\ctxlua{tex.print(math.random(#2,#3))}}} > \define\RandomFunctionName{\ctxlua{tex.print(Name[\NamedFunctionNumber])}} > > \dorecurse{10}{\RandomName{FunctionNumber}{1}{5}% > Give an example of a function $\RandomFunctionName : {\Bbb R} \longrightarrow > {\Bbb R}$ which has a derivative only at the origin, and such that > $\RandomFunctionName(0) = 1$.\par \hairline\par} > > \stoptext > %%%% begin random-names.tex
You can access the size of your Name table with #Name but have to replace # with \letterhash when you use it in a TeX command because # is already taken for the TeX arguments. \starttext \startluacode Name = {'F', 'G', 'u', 'v', 'W'} \stopluacode \define\RandomFunctionName {\startlua local listsize = \letterhash Name ; local randomvalue = math.random(1,listsize) ; context(Name[randomvalue]) \stoplua} \dorecurse{10}{Give an example of a function $\RandomFunctionName : {\Bbb R} \longrightarrow {\Bbb R}$ which has a derivative only at the origin, and such that $\RandomFunctionName(0) = 1$.\par \hairline\par} \stoptext Wolfgang ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________