1-D PLOTTING
>> x=1:20;>> y=x.*x; (square each element)>> plot(x,y)
>> pians =3.1416>> x=-pi:0.1:pi; (0.1 step size)>> y=cos(x); (element by elemt cosine)>> plot (x,y) (cosine plot)
>> z=sin(x);(cosine and sine plot)>> plot(x,y,x,z)`
>> print (prints to printer)>> print sinwaves.ps -dps (dumps postscript)