[R] how to make read-only data frames?

[Don MacQueen]

I don't know of one.

But you could use save() to save the dataframe to a different file, 
then remove the dataframe from .GlobalEnv, then attach the different 
file. While not strictly speaking read-only, that should provide good 
protection against accidental changes to the dataframe in the normal 
course of things.

-Don


At 6:13 AM -0800 1/11/08, Dan Kelley wrote:
>QUESTION: is there a way to make objects (e.g. data frames) read-only?
>
>BACKGROUND: I am writing some functions that use a data frame (frequencies
>of tidal constituents) that I want to be read-only.  I can see how to
>accomplish this within a single function (just define the data in the
>function), but I'm not sure how to share read-only values between
>(un-nested) functions.  Is there a more elegant method than duplicating the
>creation of the data frame in each function?
>
>
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062