How to save for loop results in data frame using cbind - r

Question

I have a data frame dfSub with a number of parameters inside. This is hourly based data for energy use. I need to sort data by each hour, e.g. for each hour get all values of energy from data frame. As a result I expect to have data frame with 24 columns for each hour, rows are filled with energy values.
The hour is specified as 1:24 and in data frame is linked as dfSub$hr.
The heat is dfSub$heat
I constructed a for-loop and tried to save with cbind, but it does not work, error message is about different size of rows and columns.
I print results and see them on screen, but cant save as d(dataframe)
here is the code:
d = NULL
for (i in 1:24) {
subh= subset(dfSub$heat, dfSub$hr == i)
print(subh)
d = cbind(d, as.data.frame(subh))
}
append function is not applicable, since I dont know the expected length of heat value for each hour.
Any help is appreciated.
Part of dfSub
hr wk month dyid wend t heat
1 2 1 1 0 -9.00 81
2 2 1 1 0 -8.30 61
3 2 1 1 0 -7.80 53
4 2 1 1 0 -7.00 51
5 2 1 1 0 -7.00 30
6 2 1 1 0 -6.90 31
7 2 1 1 0 -7.10 51
8 2 1 1 0 -6.50 90
9 2 1 1 0 -8.90 114
10 2 1 1 0 -9.90 110
11 2 1 1 0 -11.70 126
12 2 1 1 0 -9.70 113
13 2 1 1 0 -11.60 104
14 2 1 1 0 -10.00 107
15 2 1 1 0 -10.20 117
16 2 1 1 0 -9.00 90
17 2 1 1 0 -8.00 114
18 2 1 1 0 -7.80 83
19 2 1 1 0 -8.10 82
20 2 1 1 0 -8.20 61
21 2 1 1 0 -8.80 34
22 2 1 1 0 -9.10 52
23 2 1 1 0 -10.10 41
24 2 1 1 0 -8.80 52
1 2 1 2 0 -8.70 44
2 2 1 2 0 -8.40 50
3 2 1 2 0 -8.10 33
4 2 1 2 0 -7.70 41
5 2 1 2 0 -7.80 33
6 2 1 2 0 -7.50 43
7 2 1 2 0 -7.30 40
8 2 1 2 0 -7.10 8
The output expected as:
hr1 hr2 hr3 hr4..... hr24
81 61 53 51 ..... 52
44 50 33 41

Answer 1

One can avoid use of for-loop in this case. An option is to use tidyr::spread to convert your hourly data in wide format.
library(tidyverse)
df %>% select(-t, -wend) %>%
mutate(hr = sprintf("hr%02d",hr)) %>%
spread(hr, heat)
Result:
# wk month dyid hr01 hr02 hr03 hr04 hr05 hr06 hr07 hr08 hr09 hr10 hr11 hr12 hr13 hr14 hr15 hr16 hr17 hr18 hr19 hr20 hr21 hr22 hr23 hr24
# 1 2 1 1 81 61 53 51 30 31 51 90 114 110 126 113 104 107 117 90 114 83 82 61 34 52 41 52
# 2 2 1 2 44 50 33 41 33 43 40 8 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
Data:
df <- read.table(text =
"hr wk month dyid wend t heat
1 2 1 1 0 -9.00 81
2 2 1 1 0 -8.30 61
3 2 1 1 0 -7.80 53
4 2 1 1 0 -7.00 51
5 2 1 1 0 -7.00 30
6 2 1 1 0 -6.90 31
7 2 1 1 0 -7.10 51
8 2 1 1 0 -6.50 90
9 2 1 1 0 -8.90 114
10 2 1 1 0 -9.90 110
11 2 1 1 0 -11.70 126
12 2 1 1 0 -9.70 113
13 2 1 1 0 -11.60 104
14 2 1 1 0 -10.00 107
15 2 1 1 0 -10.20 117
16 2 1 1 0 -9.00 90
17 2 1 1 0 -8.00 114
18 2 1 1 0 -7.80 83
19 2 1 1 0 -8.10 82
20 2 1 1 0 -8.20 61
21 2 1 1 0 -8.80 34
22 2 1 1 0 -9.10 52
23 2 1 1 0 -10.10 41
24 2 1 1 0 -8.80 52
1 2 1 2 0 -8.70 44
2 2 1 2 0 -8.40 50
3 2 1 2 0 -8.10 33
4 2 1 2 0 -7.70 41
5 2 1 2 0 -7.80 33
6 2 1 2 0 -7.50 43
7 2 1 2 0 -7.30 40
8 2 1 2 0 -7.10 8",
header = TRUE, stringsAsFactors = FALSE)

Answer 2

With tidyr:
> df<-read.fwf(textConnection(
+ "hr,wk,month,dyid,wend,t,heat
+ 1 2 1 1 0 -9.00 81
+ 2 2 1 1 0 -8.30 61
+ 3 2 1 1 0 -7.80 53
+ 4 2 1 1 0 -7.00 51
+ 5 2 1 1 0 -7.00 30
+ 6 2 1 1 0 -6.90 31
+ 7 2 1 1 0 -7.10 51
+ 8 2 1 1 0 -6.50 90
+ 9 2 1 1 0 -8.90 114
+ 10 2 1 1 0 -9.90 110
+ 11 2 1 1 0 -11.70 126
+ 12 2 1 1 0 -9.70 113
+ 13 2 1 1 0 -11.60 104
+ 14 2 1 1 0 -10.00 107
+ 15 2 1 1 0 -10.20 117
+ 16 2 1 1 0 -9.00 90
+ 17 2 1 1 0 -8.00 114
+ 18 2 1 1 0 -7.80 83
+ 19 2 1 1 0 -8.10 82
+ 20 2 1 1 0 -8.20 61
+ 21 2 1 1 0 -8.80 34
+ 22 2 1 1 0 -9.10 52
+ 23 2 1 1 0 -10.10 41
+ 24 2 1 1 0 -8.80 52
+ 1 2 1 2 0 -8.70 44
+ 2 2 1 2 0 -8.40 50
+ 3 2 1 2 0 -8.10 33
+ 4 2 1 2 0 -7.70 41
+ 5 2 1 2 0 -7.80 33
+ 6 2 1 2 0 -7.50 43
+ 7 2 1 2 0 -7.30 40
+ 8 2 1 2 0 -7.10 8"
+ ),header=TRUE,sep=",",widths=c(5,3,6,5,5,7,5))
>
> library(tidyr)
> df1 <- select(df,dyid,hr,heat)
> df2 <- spread(df1,hr,heat)
> colnames(df2)[2:ncol(df2)] <- paste0("hr",colnames(df2)[2:ncol(df2)])
> df2
dyid hr1 hr2 hr3 hr4 hr5 hr6 hr7 hr8 hr9 hr10 hr11 hr12 hr13 hr14 hr15 hr16 hr17 hr18 hr19 hr20 hr21 hr22 hr23 hr24
1 1 81 61 53 51 30 31 51 90 114 110 126 113 104 107 117 90 114 83 82 61 34 52 41 52
2 2 44 50 33 41 33 43 40 8 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
>

Answer 3

I found solution that helped me to solve my task here: Append data frames together in a for loop
by using empty list and combining later on in data frame
datalist = list()
for (i in 1:24) {
subh= subset(dfSub$heat, dfSub$hr == i)
datalist[[i]] = subh
}
big_data = do.call(rbind, datalist)
both cbind and rbind work.
Thanks everyone for help :)