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.
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