How to print this function?

[lib1]

Hi, 

This is a beginner question, but can't seem to figure this out.

Please consider:

 t = [-1:0.1:1;]

f = ( 1 + t ) / ( 1 - t);

plot (t, f);


I'd like to see the behavior of f function regarding t values, but all I get
is some point.
How should I do this?

Luis

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