3.5.24 Lamerey sample

Function lamerey draw Lamerey diagram. The sample code is:

int sample(mglGraph *gr)
{
  gr->SubPlot(1,1,0,"<_");
  gr->Title("Lamerey sample");
  gr->Axis(); gr->Label('x',"\\i x");
  gr->Label('y',"\\bar{\\i x} = 2 \\i{x}");
  gr->FPlot("x","k=");  gr->FPlot("2*x","b");
  gr->Lamerey( 0.00097,"2*x","rv~");
  gr->Lamerey(-0.00097,"2*x","rv~");
}