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Can't make function periodic for t<0

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  Can't make function periodic for t<0 yitzhakbg <yitzhakbg@gmail.com> - 2011-05-30 10:35 +0000

#2811 — Can't make function periodic for t<0

This is the function to make periodic:
x[t_] := Piecewise[{{-1, -1/2 <= t < 0}, {1, 0 <= t < 1/2}}]

I saw DH's lovely post from 1/14/09:
"if we want some function f to have period L we may define an operator:
makeper[f_,L_]= f[Mod[#,L]]&
Here is an example. We want a sine with period 1:
sin1= makeper[Sin,1]"
I can't get it to work for t<0 because Mod always returns positive values.
Can anyone kindly help?
Yitzhak

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