number invert

[rivet]

I have two possible parameters +1 and -1.

After I use them in the first part of my script, I would like to invert them for the second part of my script.

so +1 becomes -1

and -1 becomes +1

what is the math function to perform this inversion. I would like to avoid an if statement.

[comment]

parameter * -1

[rivet]

nice... thanks