[NTG-context] A macro which gives a random name
Otared Kavian
otared at gmail.com
Sat Apr 18 21:16:47 CEST 2015
Hi Wolfgang,
Thanks for your attention, but the problem with your solution is that each instance of \RandomFunctionName changes the name chosen, but I need something wihich remains the same name within a given situation (say each problem) but changes from problem to problem.
For instance when using your solution with the source code
Give an example of a function $\RandomFunctionName : {\Bbb R} \longrightarrow {\Bbb R}$ which has a
derivative only at the origin, and such that $\RandomFunctionName(0) = 1$.
gives:
Give an example of a function 𝐺 : R ⟶ R which has a derivative only at the origin, and such that 𝑊(0) = 1.
while what I need is
Give an example of a function 𝐺 : R ⟶ R which has a derivative only at the origin, and such that G(0) = 1.
(The macro I sent earlier does this, but unfortunately it cannot use the solution you sent).
Is there a solution ?
Best regards: OK
> On 18 Apr 2015, at 19:23, Wolfgang Schuster <schuster.wolfgang at gmail.com> wrote:
>
>
>> Am 18.04.2015 um 18:55 schrieb Otared Kavian <otared at 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
>
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