converting negative number to positive without affecting positive number

[Sanaullah Farooq]

Hello
I have a variable "Number" containing both positive and negative numbers. I want to convert all the negative numbers to positive number without disturbing the sign of positive numbers.How can i do that

[Joseph Coveney]

help abs()

[Emad Shehata]

gen z=abs(x)

Or
replace x=abs(x)

[Emad Shehata]

Or
replace x=abs(x) if x < 0

[Milad Ahmad]

if you have negative values in more than one variables

foreach i of varlist var* {
replace `i'=abs(`i')
}