Learning Guide Learning Guide

266 • Chapter 6: Examples from Calculus> PDEplot( pde, u(x,y), ini, s=-2..2, basechar=only );5u(x,y)1–2–2y22xThe basechar=true option tells PDEplot to draw both the characteristiccurves and the surface, as well as the initial-condition curve which isalways present.> PDEplot( pde, u(x,y), ini, s=-2..2, basechar=true );u(x,y)71–2–2y22xMany plot3d options are also available. Refer to ?plot3d,options.The initcolor option sets the color of the initial value curve.> PDEplot( pde, u(x,y), ini, s=-2..2,> basechar=true, initcolor=white,> style=patchcontour, contours=20,> orientation=[-43,45] );