'path.std' (path standardized) converts a vector of strings that specify one or more directory paths into a vector of strings that specifies the same path with '/' as the path separator, e.g., 'e:\\data\\data.rda' is converted to 'e:/data/data.rda'.  This function is useful when checking whether two path specifications are identical other than possible differences in path separator, '\\' or '/'.

Note change made on 12/30/2013: path.std(x)[i] returns a string that ends in "/" iff x[i] ends in "/" or "\\".  In particular, path.std( "e:/aa/bb/" ) returns "e:/aa/bb/" but path.std( "e:/aa/bb") returns "e:/aa/bb".  Previously, path.std never returned a string that ended in "/".

Give the command, 'pchlist()', to see a display of the different plotting symbols and their codes.

phone.num converts phone numbers expressed as letters to phone numbers expressed as digits.

ARGUMENTS

z = string of digits

inverse:  If FALSE, then phone.num converts any mixture of digits and letters to digits.  If TRUE, then phone.num displays the letters that correspond to each digit in sequence of digits.

'pick.one' takes a vector as input and returns the single, non-missing, unique value in the vector.  If there is more than one non-missing value in the vector, 'pick.one' returns NA.  If there are only missing values in the vector, 'pick.one' returns NA.

'plot.autocorr' plots autocorrelations for a single parameter.  Future versions of this function will generalize it to multiple parameters.  

ARGUMENTS:

'param' = name of parameter

'chain.source' = the source of the chain(s) of sample, either a bugs object or an mcmc.list object or the output of a call to extract.chains.

'lag.c = 2^(0:6)' (default).  The lags at which the autocorrelations will be graphed.

'xlim = NA', 'ylim = NA':  x and y limits on graph.

'pch = 16' specifies the plotting character; defaults to a solid colored disk. 

'cex.pt = 1' specifies the size of the plotting character.

'title = "default"' specifies the plot title ("default" selects the default title.