[scilab-Users] index error not helpful

[Gary Nelson]

What is wrong with this seemingly simple test

clc()
n=[1:20]
z=exp(%i*2*%pi.*n./10)
phz=atan(imag(z),real(z))
ifq=diff(phz)
ifq=[ifq,ifq($)]
plot(n,phz,n,ifq)

The lengths of all vectors are 20 yet I get an error 21 index error

Thanks

Gary Nelson
gnelson at quantasonics.com