I am trying to build a function in a context where the environment
concept would appear to be useful. But I'm a bit foggy about this
concept and would appreciate some pointers and advice.
Basically the function I'm building, say foo(x,t), is a function of
two variables). Depending on the value of t, foo will return one of
the values f1(x), f2(x), ..., fk(x), where each of f1, ..., fk is a
piecewise linear function (built using approxfun()).
Now I want other functions to be able to get at these pwl functions,
making use of a syntax of the form
bar(y,foo)
so that in the code of bar() I could have assignments like
clyde <- get("f1",envir=environment(foo))
So rather than assigning f1, ..., fk in the body of foo, I would like
to assign them in the environment of foo.
I want to do something like
environment(foo) <- melvin
where melvin contains f1, ..., fk. But how do I create ``melvin''
so that it is acceptable to the foregoing assignment?
One way I ***could*** go about it would be to create melvin
as a list:
melvin <- list(f1=f1,f2=f2,etc.)
Then I could do
attach(melvin)
environment(foo) <- as.environment(2)
This seems to work ... but it also seems unnecessarily convoluted.
I could also do
assign("f1",f1,envir=environment(foo))
assign("f2",f2,envir=environment(foo))
etc.
after creating foo(), but this is tejous. I think I must be missing
a point or three. As I said, I don't really grok environments.
Given that what I want to do makes any kind of sense at all, can
someone start me off in the right direction?
cheers,
Rolf Turner
[EMAIL PROTECTED]
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