How to replace NaN value with zero in a huge data

问题:

I tried to replace NaN values with zeros using the following script:

rapply( data123, f=function(x) ifelse(is.nan(x),0,x), how="replace" )
# [31]   0.00000000  -0.67994832   0.50287454   0.63979527   1.48410571  -2.90402836

The NaN value was showing to be zero but when I typed in the name of the data frame and tried to review it, the value was still remaining NaN.

data123$contri_us
# [31]          NaN  -0.67994832   0.50287454   0.63979527   1.48410571  -2.90402836

I am not sure whether the rapply command was actually applying the adjustment in the data frame, or just replaced the value as per shown.

Any idea how to actually change the NaN value to zero?

回答1:

It would seem that is.nan doesn't actually have a method for data frames, unlike is.na. So, let's fix that!

is.nan.data.frame <- function(x)
do.call(cbind, lapply(x, is.nan))

data123[is.nan(data123)] <- 0

回答2:

In fact, in R, this operation is very easy:

If the matrix 'a' contains some NaN, you just need to use the following code to replace it by 0:

a <- matrix(c(1, NaN, 2, NaN), ncol=2, nrow=2)
a[is.nan(a)] <- 0
a

If the data frame 'b' contains some NaN, you just need to use the following code to replace it by 0:

#for a data.frame: 
b <- data.frame(c1=c(1, NaN, 2), c2=c(NaN, 2, 7))
b[is.na(b)] <- 0
b

Note the difference is.nan when it's a matrix vs. is.na when it's a data frame.

Doing

#...
b[is.nan(b)] <- 0
#...

yields: Error in is.nan(b) : default method not implemented for type 'list' because b is a data frame.

Note: Edited for small but confusing typos

回答3:

The following should do what you want:

x <- data.frame(X1=sample(c(1:3,NaN), 200, replace=TRUE), X2=sample(c(4:6,NaN), 200, replace=TRUE))
head(x)
x <- replace(x, is.na(x), 0)
head(x)