how to smoothing a curve

I have a 1000 points data...how do we do the smoothing? something like moving average in mathematica???

I tried interpolation library i.e interpl(x,y,xi) but was getting the following error

###Error using ==> interpl at 43

###X data contains repeated values!

please help me remove this error and also guide me throught the method of smoothing the curve

Answer 1

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/80508-create-a-moving-average