i'm asking about band reject filter in the frequency domain

i need a demo of band reject filter in the frequency domain ,,

Answer 1

[Image Analyst]

I tried to help by referring you to my demo that does this ( http://www.mathworks.com/matlabcentral/answers/82036#answer_91756) in your prior, duplicate question but for some reason you were unable to make the simple modifications to zero out the periodic frequencies. I don't know how much more I can do without outright doing the homework for you.

[mecheal]

i'm just a new in matlab , i can't do any modification without ur help , if u can please help me ......