moving difference function in matlab

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Hi all, I recorded the skin conductance signal which is n X 2 vector (amplitude, time). In part of signal analysis i have to apply moving-difference function with a difference interval of 50ms.
The signal sampling interval is 100Hz. Hence the interval for difference function includes 5 points.
What i understood is the moving difference function converts every point in my raw signal into the difference between the value of the point and the value of the point located in a given interval before it (50ms).
I am wondering how I can implement this in MATLAB.

Accepted Answer

Image Analyst
Image Analyst on 30 Jan 2013
You can use conv(). Like
kernel = [0 0 0 0 0 1 0 0 0 0 -1];
diffSignal = conv(signal, kernel, 'valid');
  1 Comment
tafteh on 30 Jan 2013
Edited: tafteh on 30 Jan 2013
Thanks, my kernel indeed became like this:
kernel = [0 0 0 0 1 0 0 0 0 -1];

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