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Writing a function

3 messages · vincent.stoliaroff@socgen.com, Brian Ripley, Uwe Ligges

vincent.stoliaroff@socgen.com
# 
Hi r lovers,

I have written the following  function
function(Matrix){
for (i in 1:3)
                        {
                        for (j in 1:2)
                                {if (is.na(Matrix[i,j]))
NA->(Matrix[i,j+1])}
                        }
Matrix
}

it looks correct but when I try to implement it on the MatCor Matrix I get
this error message
Error: couldn't find function "(<-"

I don't understand where does it come from since I have no string like (<-
in my code


Thanks for any help that could be provided.





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Brian Ripley
#
On Mon, 28 Apr 2003 vincent.stoliaroff at socgen.com wrote:

            

      
      
      
    

        
You do, in the line

NA->(Matrix[i,j+1])

That's an unusual way of writing

(Matrix[i,j+1]) <- NA

and you have a set of parentheses there on the LHS of the assignment.
R is looking for a function "(<-" to implement this as

Matrix[i,j+1] <- "(<-"(NA)

You don't need (or want) the parentheses.

You might want to look up how functions on the LHS of assignments are 
supposed to work in R.

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Uwe Ligges
    

    

      
      #
    

  


  

      
vincent.stoliaroff at socgen.com wrote:

            

      
      
      
    

        
Hint:

   NA->(Matrix[i,j+1])

is syntactically almost the same as

   (Matrix[i,j+1]) <- NA

but the latter (without the brackets) is less confusing.

Uwe Ligges