[R] Formatting YYYY-MM after reading text file [RESOLVED]

[Rich Shepard]

On Fri, 26 Jun 2015, Rich Shepard wrote:

> allchem$sampdate <- as.yearmon(format(%Y-%m))allchem$sampdate

   Reading the yearmon help page again led me to try
 	allchem$sampdate <- as.yearmon(allchem$sampdate)
which produces the following structure:

'data.frame':	2226 obs. of  4 variables:
  $ stream  : chr  "B" "B" "B" "B" ...
  $ sampdate:Class 'yearmon'  num [1:2226] 1992 1992 1992 1992 1992 ...
  $ param   : chr  "Cl" "SO4" "pH" "Cl" ...
  $ quant   : num  4 33 8.43 4 32 8.46 4 31 8.43 6 ...

which appears to do what's needed:

allchem
      stream sampdate param    quant
1         B Mar 1992    Cl    4.000
2         B Mar 1992   SO4   33.000
3         B Mar 1992    pH    8.430
4         B Apr 1992    Cl    4.000
5         B Apr 1992   SO4   32.000
6         B Apr 1992    pH    8.460
7         B May 1992    Cl    4.000
8         B May 1992   SO4   31.000
9         B May 1992    pH    8.430
10        B Jun 1992    Cl    6.000

   Not having before worked with dates like this I'll soon see what happens
as the analyses proceed.

Rich