Hi Dalyoung,
I tested your code: it works fine with both definitions of the variable tt in
your code. I am using the current LMTX version 2020.04.08 14:38.
Best regards: Otared
> On 11 Apr 2020, at 14:32, Jeong Dal <hak...@me.com> wrote:
>
> Dear all,
>
> I draw Pascal’s triangle with the label of each point created by using lua
> functions.
> As you see in the code below, I defined fact(n) and combi(n,r) using lua.
> For the calculation tt, I used two different methods.
> Both are working well when I run the given code.
>
> But I got an error, when I added this code to a ConTeXt file composed product
> and components,
> and using the second method, i.e. combi(n,r). The first method is still
> working well.
> The error message is as following:
>
> metapost log > loading metafun, including plain.mp version 1.004 for
> metafun iv and xl
> metapost log >
> luatex warning > mplib: run script: [string "return mp.print(combi(0,0
> ))"]:1: attempt to call a nil value (global 'combi')
>
> metapost log > >> tt
> metapost log > >> vacuous
> metapost log > ! Equation cannot be performed (numeric=vacuous).
> metapost log > <to be read again>
> metapost log > ;
> metapost log > <for(0)> ...&decimal(0)&","&decimal(EXPR0)&" ))");
> metapost log >
> now:=start+(EXPR0)*right*d...
> metapost log > <for(0)> ....now--(now+A);draw.now--(now+B);endfor
> metapost log > ; ENDFOR
> metapost log > <*> ...now+A); draw now -- (now+B); endfor; endfor
> metapost log > ;;
>
> I don’t know why the same code treated differently.
> I think that I have to do something more in luacode which I don’t know.
> Comments are wellcome!
>
> Best regards,
>
> Dalyoung
>
> %%%%%%%
>
> \startluacode
> function fact (n)
> if n <= 0 then
> return 1
> else
> return n * fact(n-1)
> end
> end
> function combi(n,r)
> return fact(n)/(fact(r)*fact(n-r))
> end
> \stopluacode
> \startbuffer[fig121]
> numeric n,r,s,u,dx,dy,tt; u := 1.8cm;
> path p, q;
> pair A,B,start,now;
> A := dir(210)*u;
> B := dir(-30)*u;
> dy := sind(30)*u;
> dx := 2*cosd(30)*u;
> for n=0 upto 4:
> start := n*dir(210)*u;
> for r=0 upto n:
> s := n-r;
> % tt := lua("mp.print(fact(" & decimal n & ")/(fact(" & decimal r &
> ")*fact(" & decimal s &" )))");
> tt := lua("mp.print(combi(" & decimal n & "," & decimal r & " ))");
>
> now := start+r*right*dx;
> dotlabel.top(textext("$\displaystyle {" & decimal n & "\choose" &
> decimal r & "} = "& decimal tt & "$"),now);
> draw now -- (now+A);
> draw now -- (now+B);
> endfor;
> endfor;
> \stopbuffer
> \starttext
> \switchtobodyfont[11pt]
> \processMPbuffer[fig121]
> \switchtobodyfont[12pt]
> \stoptext
>
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