> On 11 Oct 2015, at 14:12, Maram SAlem <marammagdysa...@gmail.com> wrote:
>
> Thanks a lot for your help and patience Duncan.
> It seems that my questions is really a trivial one but I never realized
> that 1:4 means 0 1 2 3 4 , never knew it starts from 0.
>
It doesn’t mean what you mention.
1:4 is the sequence 1 2 3 4
1:4-1 is (1 2 3 4) -1 ==> 0 1 2 3
The 1 is subtracted from all elements of the sequence.
Berend
>
>
> On 11 October 2015 at 14:07, Duncan Murdoch <murdoch.dun...@gmail.com>
> wrote:
>
>> On 11/10/2015 7:52 AM, Maram SAlem wrote:
>>> Dear All,
>>> I have a question concerning the seq() function arguments when used in a
>>> for() loop.
>>> I'll simplify this question to make it more clear. Suppose I have a
>>> (5*3)matrix s (for ex.) and I need to write a function with for() loop,
>> in
>>> each step of the loop I need to generate a sequence whose upper limit is
>>> the ith element of the first row of s, then put the resulting sequences
>> in
>>> a list. I used the following simple code (I've only included the first
>> part
>>> of the function)
>>>
>>>
>>>> s<-matrix(c(1,0,1,0,1,1,0,0,1,0,0,0,0,0,1),nrow=5,byrow=TRUE)
>>>> simpfun<- function (x,n,m,p,alpha,beta)
>>> + {
>>> + LD<-list()
>>> + for (i in 1:m-1)
>>> + {
>>> + LD[[i]]<-seq(0,x[i],1)
>>> + }
>>> + print(LD)
>>> + }
>>>> mk<-simpfun(s[1,],n=6,m=4,p=0.3)
>>> Error in seq.default(0, x[i], 1) : 'to' must be of length 1
>>>
>>> Although x is supposed to be the vector
>>> 1 0 1
>>> and thus x[1]=1, x[2]=0,x[3]=1.
>>> So I don't get why the error "Error in seq.default(0, x[i], 1) : 'to'
>> must
>>> be of length 1" occurs in the first place.
>>
>> The range of your loop is 1:m-1, where m is 4. That is
>>
>>> m <- 4
>>> 1:m-1
>> [1] 0 1 2 3
>>
>> and x[0] is length 0.
>>
>> I think you wanted 1:(m-1) (or even better, seq_len(m-1)) for your loop
>> values.
>>
>> Duncan Murdoch
>>
>>>
>>> Thanks for helping.
>>>
>>> Maram
>>>
>>> [[alternative HTML version deleted]]
>>>
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>>>
>>
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
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