# r - why cannot coerce type 'S4' to vector of type 'integer'?

Can anyone tell me why I am getting this error:

`Error in as.integer(tm) : cannot coerce type 'S4' to vector of type 'integer`?

I have been searching the internet but couldn't solve my problem.

`` library(Matrix)long <- file("C:\\New folder (5)\\inra.bin", "rb")A=readBin(long, integer(), size=2,n=67420*1, signed=F)ta<-t(A)lot <- file("C:\\New folder (5)\\lat.img", "rb")B=readBin(lot, integer(), size=2,n=67420*1, signed=F)tb<-t(B)wind <- file("C:\\Wind_WFD_200201.bin", "rb")C=readBin(wind, double(), size=4,n=67420*248, signed=TRUE)D<-matrix(C,nrow=248,ncol=67420)for(d in 1:31){M <- Matrix(-9999, 360, 720)tm<-t(M)for(i in 1:67420){tm[ta[i],tb[i]]= 10 * ((D[(d-1)*8+1,i] + D[(d-1)*8+2,i] +D[(d-1)*8+3,i] +D[(d- 1)*8+4,i] +D[(d-1)*8+5,i] +D[(d-1)*8+6,i] +D[(d-1)*8+7,i] +D[(d-1)*8+8,i] ) / 8)}###goooooooodto.write <- sprintf("C:\\Yar_%0d.bin", d)writeBin(as.integer(tm), size=2,to.write)``

}

Take a look at How to split and write to a file for S4 object in R . In your case, it appears that `Matrix` returns an S4 object. Try this:

``````foo <- Matrix(10,10,10)
slotnames(foo)
``````

That may give a suggestion as to what you want to extract from your `tm` object.
But why are you using `Matrix` in the first place? If you just use `base::matrix` this problem should disappear. Edit: peeking at the documentation for package `Matrix,` it's clear that `as.integer` is not supported. You probably would have to use `as(x,matrix)` first.