[R] For loop and using its index

[Hassan Eini Zinab]

Dear All,

I have a data set with variables x1, x2, x3, ..., x20 and I want to
create z1, z2, z3, ..., z20 with the following formula:


z1 = 200 - x1
z2 = 200 - x2
z3 = 200 - x3
.
.
.
z20 = 200 - x20.


I tried using a for loop and its index as:

for (i in 1:20) {
z(i) = 200 - x(i)
}

But R gives the following error message: "Error: could not find function "x"".

Is there any other way for a simple coding of my 20 lines of code?

Alohas,
Hassan Eini-Zinab