I have a matrix of 2134 by 2134 of correlation values and I would like to count the total number of values that are above 0.8 and below -0.8. I have tried
length(TFcoTF[TFcoTF>.8])
but this does not seem to be correct as I am getting about 50 percent of values above .8 which does not correspond to the histogram I have for the data. Also when I do
length(TFcoTF[TFcoTF<-.8])
I got 0 as the output. Any help is appreciated.
>Solution :
It’s difficult to answer without having your dataset, please provide a minimal reproducible example later.
For the first line of code, this looks correct.
For the second, the error comes from a syntax error. In R you can assign value with = and <-. So x<-1 assign the value whereas x < -1 return a boolean.
You can then combine logical values and run the code below :
set.seed(42)
m <- matrix(runif(25, min = -1, max = 1), nrow = 5, ncol = 5)
m
length(m[ m > .8]) + length(m[ m < -.8]) # long version from what you did.
length(m[ m < -.8 | m > .8]) # | mean or. TRUE | FALSE will return TRUE.
sum(m > .8 | m < -.8)
# The sum of logical is the length, since sum(c(TRUE, FALSE)) is sum(c(0, 1))
sum(abs(m) > .8) # is the shortest version