Matlab - Signal Noise Removal

Question

I have a vector of data, which contains integers in the range -20 20.

Bellow is a plot with the values:

Answer 1

If it's for demonstrative purposes only, and you're not actually going to be using these scaled values for anything, I sometimes like to increase contrast in the following way:

% your data is in variable 'a'
plot(a.*abs(a)/max(abs(a)))

edit: since we're posting images, here's mine (before/after):