2.5.16 Mark sample

Function mark draw markers at points. It is mostly the same as Plot but marker size can be variable. The sample code is:

int sample(mglGraph *gr)
{
 mglData y,y1; mgls_prepare1d(&y,&y1);
 gr->SubPlot(1,1,0,""); gr->Title("Mark plot (default)");
 gr->Box(); gr->Mark(y,y1,"s");
 return 0;
}

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