The routine nsys.m will use the Euler method to solve a 2 by 2 system. To set up the calculation, you need to edit initnsys.m. For instance, if your system of equations is
eulerfcn1='x+h*(t+x+y)'; eulerfcn2='y+h*x^2'; h=0.1; t0=0; tf=0.5; x0=2; y0=3;After you edit initnsys.m, save it, then run initnsys, followed by nsys. The graphics window will show a plot of and versus , while the command window shows the computed numerical values.