[R] Error in rowSums

[Amit Patel]

Hi 

I am trying to calculate the row sums of a matrix i have created
The matrix ( FeaturePresenceMatrix) has been created by

1) Read csv
2) Removing unnecesarry data using [-1:4,] command
3) replacing all the NA values with as.numeric(0) and all others with as.numeric 
(1)

When I carry out the command

TotalFeature <- rowrowSums(FeaturePresenceMatrix, na.rm = TRUE)

I get the following error. 

Error in rowSums(FeaturePresenceMatrix, na.rm = TRUE) : 
  'x' must be numeric

Any tips onhow I can get round this?

Thanks in Advance
Amit