> This might be a little late: but how about this (slightly clumsy) function:
>
> putValues <- function(Insert, Destination, Location) {
> Location = as.matrix(Location)
> Location = array(Location,dim(Destination))
> Destination[Location] <- Insert
> return(Destination)
> }
>
> It currently assumes that the location array lines up in dimension order,
> but other than that seems to work pretty well. If you want, it shouldn't be
> hard to change it to take in a set of dimensions to arrange Location along.
> If you like any of the other suggested behaviors, you could put in a
> is.null(Insert) option that returns the desired subset of values. I haven't
> tested it completely, but for a few sample inputs, it seems be do as
> desired.
>
> Michael
>
>
> On Wed, Aug 3, 2011 at 5:00 PM, Jannis <bt_jan...@yahoo.de> wrote:
>
>> Thanks for all the replies!Unfortunately the solutions only work for
>> extracting subsets of the data (which was exactly what I was asking for) and
>> not to replace subsets with other values. I used them, however, to program a
>> rather akward function to do that. Seems I found one of the few aspects
>> where Matlab actually is slightly easier to use than R.
>>
>>
>> Thanks for your help!
>> Jannis
>>
>> On 08/01/2011 05:50 PM, Gene Leynes wrote:
>>
>>> What do you think about this?
>>>
>>> apply(data, 3, '[', indices)
>>>
>>>
>>> On Mon, Aug 1, 2011 at 4:38 AM, Jannis<bt_jan...@yahoo.de> wrote:
>>>
>>> Dear R community,
>>>>
>>>>
>>>> I have a general question regarding indexing in multidiemensional
>>>> arrays.
>>>>
>>>> Imagine I have a three dimensional array and I only want to extract on
>>>> vector along a single dimension from it:
>>>>
>>>>
>>>> data<- array(rnorm(64),dim=c(4,4,4))
>>>>
>>>> result<- data[1,1,]
>>>>
>>>> If I want to extract more than one of these vectors, it would now really
>>>> help me to supply a logical matrix of the size of the first two
>>>> dimensions:
>>>>
>>>>
>>>> indices<- matrix(FALSE,ncol=4,nrow=4)
>>>> indices[1,3]<- TRUE
>>>> indices[4,1]<- TRUE
>>>>
>>>> result<- data[indices,]
>>>>
>>>> This, however would give me an error. I am used to this kind of indexing
>>>> from Matlab and was wonderingt whether there exists an easy way to do
>>>> this
>>>> in R without supplying complicated index matrices of all three
>>>> dimensions or
>>>> logical vectors of the size of the whole matrix?
>>>>
>>>> The only way I could imagine would be to:
>>>>
>>>> result<- data[rep(as.vector(indices),****times=4)]
>>>>
>>>> but this seems rather complicated and also depends on the order of the
>>>> dimensions I want to extract.
>>>>
>>>>
>>>> I do not want R to copy Matlabs behaviour, I am just wondering whether I
>>>> missed one concept of indexing in R?
>>>>
>>>>
>>>>
>>>> Thanks a lot
>>>> Jannis
>>>>
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>>>> >
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>>>> >
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>>>>
>>>>
>> ______________________________**________________
>> R-help@r-project.org mailing list
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>>
>
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