R help - Jun 2015 - Need some help with converting MATLAB .m script to R

Hello,
         I have few scripts that have been written in MATLAB. I need to
translate or convert them into R. They all deal with reading in a netcdf
file and doing some plots. I managed to read in the netcdf file with these
API calls

# Read input file

input_dir = "/home/aan/aa/data/r"
file = "RRR"

input_file = file.path(input_dir,file)

library(ncdf4)

Upto this everything works. Here is the MATLAB code for which I need help

% Plot continental boundaries (rotated latitude/longitude)
figure;
inp.COAST_RLON.data ( inp.COAST_RLON.data< -900 ) = NaN;
inp.COAST_RLAT.data ( inp.COAST_RLAT.data< -900 ) = NaN;
plot(inp.COAST_RLON.data,inp.COAST_RLAT.data,'k');


Regards,
Ashwin.

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