i%%PLOTS ERROR USING ISOMETRY FOR Chi_(pi/4) ON [-PI,PI] %%and so gives answer to problem A5. N = 20; error = zeros(1,N); error(1) = 3*pi/8; for j=1:(N-1) error(j+1) = error(j) - (4/pi)* (1/j)^2 * (sin(j*pi/4))^2; end pererror = 100*error/(pi/2); plot(1:N, pererror, '.')