[S] Using apply with Global variables

["Kirthi Kalyanam" <kkalyanam@scu.edu>]

A question:

Here is a simplification of some code that I am working on:

x_0
myfunction_function(y,x) {
x=x+y
return(y-x)^2
}

z_apply(y,1,funct,x)

The problem is that the value of x needs to be updated  each time 'myfunction' 
is applied.  But in the above code x will always be zero.  It seems that one 
approach is to somehow declare x to be a global variable so that it can be 
changed within 'myfunction'.

How does one declare global variables in S?

Appreciate any other solutions.

Kirthi Kalyanam

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