R help - Jan 2003 - factor analysis (pca): how to get the 'communal

On 4 Jan 2003 at 12:51, Wolfgang Lindner wrote:

> Please excuse me, if the following questions are *too* off-topic, but I
found it
> interesting. In inspecting your code I came across an R feature, I could
not
> find in the online manuals:
> 
> Q1. Looking at the left-handside in your function def:
> 
> "cov.cor" <- function ( covmat ) {
>                         sdev <- diag ( sqrt ( diag ( covmat ) ) ) 
>                         solve(sdev) %*% covmat %*% t(solve(sdev))  }
> ^       ^
> |       |
> ?       ?
> 
> - *Why* is the (identifier) function name cov.cor included in question
marks?
> - How is "cov.cor" then called?  "cov.cor"(..) or
cov.cor(..) or ?
The quotation marks are the result of using dump() to write the set of functions
to a
file.  As was pointed out, it is not necessary to use quotation marks when
calling any
of these  functions.

As far as documentation, I simply have not done it yet.  In the meantime, if you
have
specific questions about how to use some of the functions, I can provide some 
examples and some on the fly documentation, let me know, specifically, what you 
want to use/know.  That, we should probably take off-list however.

In generall, you can source() the .R file in.  After doing that the entire set
of functions
will be available in your workspace for you to see using ls() and examine by
calling
the function name.

Regards, Brett










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