CODEWITHSUNDEEP
rstatistics
small_world
small_world

Reputation: 139

How to ignore negative values while calculating statistics in R?

Is it possible to ignore negative values when calculating mean, min, max and standard deviation from an R integer array? I have a 22*22 array with many negative values of -128. I want to only consider the positive values and the count of positive values when calculating the above statistics.

Upvotes: 0

Views: 7355

Answers (1)

MrFlick
MrFlick

Reputation: 206606

You can filter the values

#sample data
x<-c(4,1,10,-128,54,14,16,-128)

#filter helper function
isPositive <- function(x) x>=0

#calculate value(s)
mean(x)
#[1] -19.625

mean(Filter(isPositive, x))
# [1] 16.5

But if you have multiple -128 it sounds like that value might actually represent missing data. It may be easier to set those as NA

x[x==-128] <- NA

then you could just do

mean(x, na.rm=T)
# [1] 16.5

Upvotes: 2

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