[R] Finding the Mean of a Specific Set of Columns
Frederick Thielen
th|e|en @end|ng |rom e@hpm@eur@n|
Thu Feb 14 17:36:43 CET 2019
Hi,
try
library("dplyr")
plot <- c(104, 104 ,104 ,104 ,104 ,105 ,105 ,105 ,105 ,105,106,
106,106, 106, 106,108, 108,108,108,108)
lai <- c(82, 167, 248, 343, 377, 64, 139, 211, 296, 348,
94, 167,243,281,332,83, 382,320,146,129)
leaf <- c(1,2, 3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5)
df <- cbind(plot, lai, leaf) %>% data.frame()
df %>% dplyr::group_by(plot) %>%
dplyr::summarise(mean = mean(lai, na.rm = T))
Best,
Frederick
-----Original Message-----
From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Isaac Barnhart
Sent: donderdag 14 februari 2019 15:32
To: r-help using r-project.org
Subject: [R] Finding the Mean of a Specific Set of Columns
I am having trouble finding the mean of a specific part of my dataset. Here is a sample of it:
plot lai leaf
1 104 82 1
2 104 167 2
3 104 248 3
4 104 343 4
5 104 377 5
6 105 64 1
7 105 139 2
8 105 211 3
9 105 296 4
10 105 348 5
11 106 94 1
12 106 167 2
13 106 243 3
14 106 281 4
15 106 332 5
16 108 83 1
17 108 382 2
18 108 320 3
19 108 146 4
20 108 129 5
I have many different plot numbers, none of which follow any kind of specific numeric sequence (even though I have sorted them from smallest to largest). I need to take the average (mean) of the LAI for each plot, and was wondering if there was a way to specify the code to do this. For example: I need the average of all the LAI measurements for each leaf of plot 104, 105, etc. Any help would be appreciated. Thanks!
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