how to impletement this

I have the following equation,please tell how to implement it

http://imgur.com/EmlFH

Answer 1

[Lalit Patil]

 Use for loop for limit of sigma...
 Use SUM command for sigma..
 use SQRT command for square root.

Its simple but only effort is required from from you..

[Walter Roberson]

And read the documentation for norm()