[R] numeric(0)

[dax42]

Hi,

it's true, simply adding the parenthesis does the trick.
Anyways, I am trying to do it without the loop now.

Thanks for helping out!
Cheers, Dax

Am 29.12.2004 um 14:45 schrieb (Ted Harding):

> On 29-Dec-04 dax42 wrote:
>> I am now trying to sum up all the scores with the following code:
>>
>> score<-0;
>>
>> for(j in 1:length(sequence)-1){
>>       score<-score+mscore[sequence[j],sequence[j+1]];
>> }
>>
>> where sequence is the string sequence.
>> Unfortunately, it does not work and I get the following error message:
>>
>> Error in "[<-"(`*tmp*`, 1, i, value = numeric(0)) :
>>       nothing to replace with
>
> You've fallen into a classic trap: 1:length(sequence)-1 does not
> mean what one might naturally expect.
>
>> sequence<-(1:10)
>> length(sequence)
> [1] 10
>> 1:length(sequence)-1
>  [1] 0 1 2 3 4 5 6 7 8 9
>> 1:(length(sequence)-1)
> [1] 1 2 3 4 5 6 7 8 9
>
> In other words, "1:length(sequence)" is constructed first, then
> 1 is subtracted from every element. As a result, you tried to
> read from sequence[0], which isn't there.
>
> However, you can make it evaluate "length(sequence)-1" before
> constructing 1:(length(sequence)-1), by using the parantheses
> to force precedence.
>
> Cheers,
> Ted.
>
>
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> Date: 29-Dec-04                                       Time: 13:45:25
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