On 29/10/2009 6:06 AM, Fran100681 wrote:
Hello,
just a simple question
How can I do to invert the sign of a number? (for example: -4 to 4, 2 to -2
and so on..)
I was looking for a specific function in R but I didn't found it...
thank you
You want the unary - operator. For example,
-x
has opposite signs to x.
Even
--4
will work to give 4, but it will scare C programmers, so it's probably
best to use parentheses:
-(-4)
Duncan Murdoch
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