The correct syntax is:
mean(data$pressure[2:20])
or if you mean to get the mean value of all values between 2
and 10
:
with(data, mean(pressure[pressure > 2 & pressure < 10]))
سؤال
Given is the data.frame "data" with one column containing numeric values. I now want to calculate the mean of the range from value 2 to value 10 only.
I tried to adress it like this
mean(data$pressure[2]:data$pressure[10])
but r just prints the single value of data$pressure[2], no mean in sight. The problem seems to be all about communicating to r, that the mean is supposed to cover a range, instead of a list.
As aimed-at example:
mean(1:4)
which calculates the mean of 1, 2, 3 and 4 perfectly (=2.5).
I would prefere to do this without using packages, just with the default functions of r.
Edit: By trying it with more numbers as input for the mean I noticed that the output is limited to six decimal places. Is there a way to increase the number of digits?
المحلول
The correct syntax is:
mean(data$pressure[2:20])
or if you mean to get the mean value of all values between 2
and 10
:
with(data, mean(pressure[pressure > 2 & pressure < 10]))