Example of mark.
MGL code:
call 'prepare1d' subplot 1 1 0 '':title 'Mark plot (default)':box:mark y y1 's'
C++ code:
void smgl_mark(mglGraph *gr) { mglData y,y1; mgls_prepare1d(&y,&y1); if(big!=3) { gr->SubPlot(1,1,0,""); gr->Title("Mark plot (default)"); } gr->Box(); gr->Mark(y,y1,"s"); }