[BioC] replacing values using their indices

[Matthew McCall]

> mydata
     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]    1    2    3    4    1    6
[2,]    2    3    4    5    6    6
[3,]    3    5    6    2    7    0
> myindices
     [,1] [,2]
[1,]    1    2
[2,]    1    5
[3,]    3    5
> mydata[myindices] <- NA
> mydata
     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]    1   NA    3    4   NA    6
[2,]    2    3    4    5    6    6
[3,]    3    5    6    2   NA    0


On Sat, Feb 12, 2011 at 7:09 AM, Daniel M. <danielmessay at yahoo.com> wrote:
> Hello,
>
> I was trying to replace some values in a data matrix using their index as a
> reference by NA.
> Say i have the following data matrix
>
> mydata
>
> 1 2 3 4 1 6
> 2 3 4 5 6 6
> 3 5 6 2 7 0
>
> and i have also
> myindices
> 1 2
> 1 5
> 3 5
>
> that refers to the data values above, for example 1 2 means that row 1 and
> column 2, that has a value of 2 in mydata, 1 5 means the value 1 in the first
> row and 5th col.
>
> I want to replace those index values as in "myindices" from "mydata" by NA's.
>
> Is there anyone who can suggest me as to how to do this, please?
>
> Thank you
>
> Daniel
>
>
>
>
>        [[alternative HTML version deleted]]
>
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-- 
Matthew N McCall, PhD
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