matlab课后作业 北交大 钱满义(4)

10.80.60.40.20-0.2-0.4-0.6-0.8-1-50-40-30-20-1001020304050

W=0.5pi k=-50:50; >> w=0.5*pi; >> xk=sin(w.*k); >> stem(k,xk);

10.80.60.40.20-0.2-0.4-0.6-0.8-1-50-40-30-20-1001020304050

W=0.9pi k=-50:50; >> w=0.9*pi; >> xk=sin(w.*k); >> stem(k,xk);

10.80.60.40.20-0.2-0.4-0.6-0.8-1-50-40-30-20-1001020304050

W=1.1pi k=-50:50; >> w=1.1*pi; >> xk=sin(w.*k); >> stem(k,xk);

10.80.60.40.20-0.2-0.4-0.6-0.8-1-50-40-30-20-1001020304050

W=1.5pi k=-50:50; >> w=1.5*pi; >> xk=sin(w.*k); >> stem(k,xk);

10.80.60.40.20-0.2-0.4-0.6-0.8-1-50-40-30-20-1001020304050

W=1.9pi k=-50:50; >> w=1.9*pi; >> xk=sin(w.*k); >> stem(k,xk);