I'm still working on incorporating interactions into
the computation of the covarinace matrix.
I need to combine multiple string values into a single
string, in a one-to-one way. For example, in the following
data set, there are two variables, each with two values:
var1 var2
ae f
a ef
I don't want to just concatenate the values because
I would have aef in both cases.
I can work around this by using strtol, or something
like it. Two questions:
1. Is there some other function I should use?
2. Will this approach cause problems in the future if the union value
contains a long string?
-Jason
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