Rodrigo Díaz wrote
> Hi. I have a matrix like this:
> cycle=c(rep(1,3),rep(2,3),rep(3,3),rep(4,3))col=c(rep("blue",2),rep("green",2),rep("blue",2),rep("green",2),rep("blue",2),rep("green",2))values=c(1:12)data.frame(cycle,col,values)
> # cycle col values#1 1 blue 1#2 1 blue 2#3 1
> green 3#4 2 green 4#5 2 blue 5#6 2 blue
> 6#7 3 green 7#8 3 green 8#9 3 blue 9#10
> 4 blue 10#11 4 green 11#12 4 green 12
> I want to select or extract values matching 2 conditions. For example:
> values from col "blue" and cycle "1". If I use : values[col==blue] I get
> all blue values. I tried using values[c(col==blue,cycle==1)] but is not
> working. Please help. I have a very big data matrix and I do not wanna go
> to excel and start cutting the data. Thanks.
>
>
> [[alternative HTML version deleted]]
>
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How about
# Your Code
cycle=c(rep(1,3),rep(2,3),rep(3,3),rep(4,3))
col=c(rep("blue",2),rep("green",2),rep("blue",2),rep("green",2),rep("blue",2),rep("green",2))
values=c(1:12)
df <- data.frame(cycle,col,values)
# Subset data frame df
df[cycle==1 & col=="blue",]
HTH
Pete
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
