Right function for Discrete Convolution

[NZG]

I need to convolve a 2 vector of discrete samples with a vector representing a 
unit sample response system.
Looking at "conv" I see that it returns a vector of size greater than the 
original dimensions of the sample.
This doesn't seem to make sense, am I missing something?
I know this is a Matlab cloned function, but Matlab doesn't describe it well 
either. 
How can I convolve two sequences and get a resulting vector that I can plot 
against the original time vector?

thx,
NZG. 



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