"Error in <function(x)> : object'<x>' not found"

I have defined a simple function:

function1<-function(x){if (X<0) {-x} else {x}}

When attempting to call it with an argument, i.e.:


R yields:

"Error in function1(1) : object 'x' not found"

What is wrong? How it can be corrected?

P.S. Before calling the function I have been also trying to assign in a seperate line of the code a value to the x, nevertheless the result has been the same, although the x is listed in the "Global Environment" panel in the R Studio.

R is case sensitive, and you are using X and x in your code as if they were the same.

It works now. Thank you.

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