2.5.7 Stem sample

Function stem draw vertical bars. It is most attractive if markers are drawn too. The sample code is:

int sample(mglGraph *gr)
{
  mglData y;  mgls_prepare1d(&y); gr->SetOrigin(0,0,0);
  mglData yc(30), xc(30), z(30);  z.Modify("2*x-1");
  yc.Modify("sin(pi*(2*x-1))"); xc.Modify("cos(pi*2*x-pi)");
  gr->SubPlot(2,2,0,"");  gr->Title("Stem plot (default)");
  gr->Box();  gr->Stem(y);

  gr->SubPlot(2,2,1); gr->Title("3d variant");  gr->Rotate(50,60);
  gr->Box();  gr->Stem(xc,yc,z,"rx");

  gr->SubPlot(2,2,2,"");  gr->Title("'!' style");
  gr->Box();  gr->Stem(y,"o!rgb");
  return 0;
}

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