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This is a function file that plots the slopefield for the ODE entered as ftx in init.m. Its MATLAB command is slopef(ftx,N). It uses a N $\times$ N grid of small slope lines to outline solutions to the ODE $x' \,=\, f(t,x)$ from data in init.m. The slopefield is plotted within the $tx$-rectangle specified by initax. slopef(ftx,N) is also automatically called by sol1.m and hw3plot.m. Note that slopef.m automatically erases anything currently displayed in the active graphics window.

Michael Renardy