How to flip sign in the X values, from time t=0 ?

t             X
-10      17
-9      76
-8      76
-7      76
-6      76
-5      78
-4      76
-3      70
-2      76
-1      76
0      74
1      76
2      76
3      76
4      76
5      76
6      76
7      76
8      76
9      76
10      76

Answer 1

[Pawel Jastrzebski]

Flip sign as in changing from positive to negative?

x(t>0) = -x(t>0)

[Lal]

Thank you for your quick response. It worked.

Answer 2

[Birdman]

If you want to plot from t=0, then

plot(t(t>=0),X(t>=0))