Working with 5 subset streams from my source data frame, three of them
successfully call dcast(), but two fail:
jerritt.cast <- dcast(jerritt.melt, site + sampdate ~ param)
Aggregation function missing: defaulting to length
and
winters.cast <- dcast(winters.melt, site + sampdate ~ param)
Aggregation function missing: defaulting to length
Yet both data frames have the values in their .melt data frames:
summary(jerritt.melt)
site sampdate param variable
JCM-1 :2178 Min. :1978-03-28 pH : 292 quant:7519
JCM-20A:2149 1st Qu.:1996-05-24 As : 286
JC-E : 476 Median :2000-05-31 SO4 : 271
JC : 400 Mean :2001-02-04 TDS : 271
GD-1 : 395 3rd Qu.:2006-05-31 Cl : 253
JC-2 : 349 Max. :2009-12-30 Zn : 250
(Other):1572 (Other):5896
value
Min. : 0.000
1st Qu.: 0.005
Median : 0.650
Mean : 317.588
3rd Qu.: 27.000
Max. :20450.000
NA's : 2134.000
and
summary(winters.melt)
site sampdate param variable
WC :601 Min. :1987-07-23 As : 96 quant:1189
WC-2 :327 1st Qu.:1994-06-15 TDS : 79
WC-1 :261 Median :1995-07-27 NO3-N : 74
BC-0.5 : 0 Mean :1997-05-15 pH : 72
BC-1 : 0 3rd Qu.:1996-07-29 SO4 : 69
BC-1.5 : 0 Max. :2011-06-06 Cl : 64
(Other): 0 (Other):735
value
Min. : 0.00
1st Qu.: 0.05
Median : 7.59
Mean : 79.20
3rd Qu.: 75.00
Max. :2587.00
NA's : 252.00
What might be causing dcast() to fail with these two data frames while it
succeeds with three others processed using the same syntax? If additional
information would help, let me know and I'll provide it.
Puzzled,
Rich
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