My dataset has 523 rows and 93 columns and it looks like this:
data <- structure(list(`2018-06-21` = c(0.6959635416667, 0.22265625,
0.50341796875, 0.982942708333301, -0.173828125, -1.229259672619
), `2018-06-22` = c(0.6184895833333, 0.16796875, 0.4978841145833,
0.0636718750000007, 0.5338541666667, -1.3009207589286), `2018-06-23` = c(1.6165364583333,
-0.375, 0.570800781250002, 1.603515625, 0.5657552083333, -0.9677734375
), `2018-06-24` = c(1.3776041666667, -0.03125, 0.7815755208333,
1.5376302083333, 0.5188802083333, -0.552966889880999), `2018-06-25` = c(1.7903645833333,
0.03125, 0.724609375, 1.390625, 0.4928385416667, -0.723074776785701
)), row.names = c(NA, 6L), class = "data.frame")
Each row is a city, and each column is a day of the year.
After calculating the row average in this way
data$mn <- apply(data, 1, mean)
I want to create another column data$duration
that indicates the average length of a period of consecutive days where the values are > than data$mn
.
I tried with this code:
data$duration <- apply(data[-6], 1, function(x) with(rle`(x > data$mean), mean(lengths[values])))
But it does not seem to work. In particular, it appears that rle( x > data$mean)
fails to recognize the end of a row.
What are your suggestions?
Many thanks
EDIT
Reference dataframe has been changed into a [6x5]
The main challenge you're facing in your code is getting apply
(which focuses on one row at a time) to look at the right values of the mean
. We can avoid this entirely by keeping the mean out of the data frame, and doing the comparison data > mean
to the whole data frame at once. The new columns can be added at the end:
mn = rowMeans(data)
dur = apply(data > mn, 1, function(x) with(rle(x), mean(lengths[values])))
dur
# 1 2 3 4 5 6
# 3.0 1.5 2.0 3.0 4.0 2.0
data = cbind(data, mean = mn, duration = dur)
print(data, digits = 2)
# 2018-06-21 2018-06-22 2018-06-23 2018-06-24 2018-06-25 mean duration
# 1 0.70 0.618 1.62 1.378 1.790 1.2198 3.0
# 2 0.22 0.168 -0.38 -0.031 0.031 0.0031 1.5
# 3 0.50 0.498 0.57 0.782 0.725 0.6157 2.0
# 4 0.98 0.064 1.60 1.538 1.391 1.1157 3.0
# 5 -0.17 0.534 0.57 0.519 0.493 0.3875 4.0
# 6 -1.23 -1.301 -0.97 -0.553 -0.723 -0.9548 2.0
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