I am using ggplot for ploting. I came up with a problem, the code is:
require(ggplot2)
require(reshape2)
df <- data.frame(HMn25_30$avg,for30$cgsbi_1,dt_hmn$dt)
names(df)[1]='WSN 25'
names(df)[2]='MetoSwiss Forecast'
df.m <- melt(df, names(df)[3], names(df)[1:2])
df.m$dt_hmn.dt <- strptime(as.character(df.m$dt_hmn.dt), format = "%m/%d/%Y %H:%M:%S")
p <- ggplot(df.m, aes(x = dt_hmn.dt, y = value, group = variable, color = variable))
size=14),axis.text.y = element_text(angle=00, vjust=0.5, size=30))
p
Data:
> head(df.m)
dt_hmn.dt variable value
1 9/29/2007 23:00 WSN 25 0.280
2 9/30/2007 0:00 WSN 25 0.208
3 9/30/2007 1:00 WSN 25 -0.264
4 9/30/2007 2:00 WSN 25 -0.480
5 9/30/2007 3:00 WSN 25 -0.708
6 9/30/2007 4:00 WSN 25 -0.714
str(df.m)
'data.frame': 50 obs. of 3 variables:
$ dt_hmn.dt: Factor w/ 25 levels "9/29/2007 23:00",..: 1 2 3 14 19 20 21 22 23 24 ...
$ variable : Factor w/ 2 levels "WSN 25","MetoSwiss Forecast": 1 1 1 1 1 1 1 1 1 1 ...
$ value : num 0.28 0.208 -0.264 -0.48 -0.708 -0.714 -0.498 -0.216 0.126 0.574 ...
when I want to use strptime
all the time_date column is changing to the "NA".
Plz guide me in this matter.
You can not use :%S
because you don't have it in your data. Try this:
strptime(dt$dt_hmn.dt, "%m/%d/%Y %H:%M")
# [1] "2007-09-29 23:00:00" "2007-09-30 00:00:00" "2007-09-30 01:00:00"
# "2007-09-30 02:00:00" "2007-09-30 03:00:00" "2007-09-30 04:00:00"
You don't seem to have seconds in your timestamps. So maybe you should use :
df.m$dt_hmn.dt <- strptime(as.character(df.m$dt_hmn.dt), format = "%m/%d/%Y %H:%M")
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