I have a very large file with many rows and columns.  I want to create a plot with lowess.  
 
If I try the following it works fine:

data(PrecipGL)

plot(PrecipGL)

lines(lowess(time(PrecipGL),PrecipGL),lwd=3, col=2)

 

In my file, 2 columns are "nox" and "sdate", and are both typeof() = double.  If I issue command 

Plot(nox~sdate) 

I can get a nice plot.

 

However if I try

lines(lowess(time(nox~sdate),nox~sdate),lwd=3, col=2)

it returns an error that it is not a matrix

 

if I try to extract these 2 columns into a matrix

mdat <- matrix(date,nox, byrow=TRUE)

doesn't work, and search for help did not work, so am posting.  

 

Obviously I am a newbee here.  Thanks for any help!!

 
Gregory A. Graves
Lead Scientist
REstoration COoordination and VERification (RECOVER) Division
Everglades Restoration Resource Area
South Florida Water Management District
Phones:  DESK: 561 / 681 - 2563 x3730
             CELL:  561 / 719 - 8157
             

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