Dear Hans, Your code works fine.

\starttext

\startMPcode numeric maxCount; maxCount := 10; setglobalmacro("MyMacro",decial maxCount); setglobalcount("MyCount",maxCount); \stopMPcode

\dorecurse{\MyMacro}{It is \recurselevel. }\par \dorecurse{\MyCount}{It is \recurselevel. }\par

\stoptext

I applied your method to my code as following. \newcount\udCount %%% add count \startMPinitializations%{UDBasic} pair A,B,C,D; pair E, F, G, H; path p,q; numeric ang,maxNum; numeric n; %AM Added u:=1in; A=(.95*TextWidth,u); B=(0,u); C=(0,0); D=(.95*TextWidth,0); p := A--B--C--D; q := (TextWidth,1.5u)--(0,1.5u)--(0,-.5u)--(TextWidth,-.5u)--cycle; z0=(.1u,0); vardef nextPt (expr M,N) = if ypart(N) = 0: H := whatever[N, N + dir(.5*angle(M-N))*u] = whatever[A,B]; else: H := whatever[N, N + dir(.5*angle(M-N))*u] = whatever[C,D]; fi; H enddef; def grayUD(expr i) = draw G -- if ypart(B)=ypart(G): B -- C else: C -- B fi --z[i]; filldraw z[i]+2*(G-z[i])*u -- z[i] -- z[i+1] -- z[i+1]+(G-z[i])*u -- cycle withcolor .75white; draw G -- z[i+1] dashed evenly; draw z[0] for k=0 upto i: --z[k] endfor dashed evenly; clip currentpicture to q; enddef; def linesUD(expr i) = draw p; draw z0 for k=0 upto i+1: --z[k] endfor dashed evenly; % AM: removed. Set in in the main code % setbounds currentpicture to boundingbox q; enddef; ang := 40; z[1] = whatever[z[0], z[0]+dir(ang)*u] = whatever[A,B]; % AM: Changed next line from G to z[-1] z[-1] = whatever[z[0], z[0]+dir(2*ang)*u] = whatever[A,B]; for k = 2 upto 20: z[k] = nextPt(z[k-2],z[k-1]); maxNum := k; exitif xpart(z[k]) > TextWidth; endfor; maxNum := maxNum-1; setglobalmacro("udMacro",decimal maxNum); %%% define udMacro and udCount setglobalcount("udCount",maxNum); \stopMPinitializations \startuseMPgraphic{foldUD}{num} numeric n; n := \MPvar{num}-1; G := z[n-1]; grayUD(n); \stopuseMPgraphic \startuseMPgraphic{dotLines}{num} numeric n; n := \MPvar{num}-1; linesUD(n); \stopuseMPgraphic \setupinteraction[state=start] \usemodule[animation] \starttext %\startanimation[menu=yes] %{ \dorecurse{\udCount} {\useMPgraphic{foldUD}{num=\recurselevel}} {\useMPgraphic{dotLines}{num=\recurselevel}} %} %\stopanimation \stoptext 1. Using “udCount” doesn’t issue error message, but it draws the path p only. 2. Using “udMacro” issue the error message. Is there anything that I miss? Best regards, Dalyoung ********** tex error > tex error on line 75 in file /Users/graph/Library/Mobile Documents/com~apple~CloudDocs/texMain/funmath/foldBandMPnew.tex: Undefined control sequence <argument> \udMacro <macro> \dorecurse #1->\ifcase #1 \relax \expandafter \gobbletwoarguments \or \expandafter \syst_helpers_recurse_y \else \expandafter \syst_helpers_recurse_x \fi {#1} \dorecurse{\udMacro} 65 numeric n; 66 n := \MPvar{num}-1; 67 linesUD(n); 68 \stopuseMPgraphic 69 70 \setupinteraction[state=start] 71 \usemodule[animation] 72 \starttext 73 %\startanimation[menu=yes] 74 %{ 75 >> \dorecurse{\udMacro} 76 {\useMPgraphic{foldUD}{num=\recurselevel}} 77 {\useMPgraphic{dotLines}{num=\recurselevel}} 78 %}

On 6/24/2021 5:39 AM, Aditya Mahajan wrote:

You need to call the setglobalmacro(...) macro. The code inside \startMPinitializations is only executed when you call any MP environment. But you are using \udCount before \useMPgraphic. A simple solution is to run dummy MP code so that MP initializations are run:

\starttext \setbox\scratchbox\hbox{\startMPcode draw unitcircle; \stopMPcode} \dorecurse{\udCount} {\useMPgraphic{foldUD}{num=\recurselevel}} {\useMPgraphic{dotLines}{num=\recurselevel}} \stoptext A run with no sideeffects in the content stream is:

\startMPcalculation .... \stopMPcalculation Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------