# [R] hi

PIKAL Petr petr.pikal at precheza.cz
Fri Nov 14 13:59:34 CET 2014

```It seems rather complicated. AFAIK cor gives you correlation matrix, you can check items in this matrix but I do not understand your rules.
¨
Cheers
Petr

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Cox Lwaka
> Sent: Friday, November 14, 2014 10:20 AM
> To: r-help at r-project.org
> Subject: Re: [R] hi
>
> Thanks,Following your explanation i have through bi conductor but still
> unable to figure out how to group. for the data, my data takes values
> 0,1,2  hence simulating from a multinomial distribution such as
> (rmultinom(10, size = 3, prob = c(0.1,0.2,0.8))) gives 10 variables
> from three individuals assume this variables are ordered.I am to
> develop an r algorithm that will develop groups as follows;
> i) Calculate the correlation between successive variables and
> correlation matrix for all the variables
> ii) if r(i) is the maximum correlation coefficient in the successive
> variable correlation then my first group has variables [x(i-k ),
> ...x(i),... x(i+k )]. this gives me group one of size 2k+1. note that
> variables are picked on that line and order is maintained.iii) the max
> r is removed from the list of successive correlation between variables,
> but we don't recalculate the correlation since this will destroy the
> array.
> iv)check for remaining correlation btn successive variables relative to
> the bigger correlation matrix and select  other groups. these groups
> don't need to be of same size and they must not overlap.
> e.g,if for instance  x1, x2,......x10   are my 10 variables. i
> calculate correlation btn successive variable. Say the max correlation
> is  Cor(x4,x5) i take group one to have values (x2,x3,x4,x5),   my data
> remains,   x1,-,-,-,-,x6,x7,x8,x9,x10. Clearly x1 will form a group and
> the algorithm has to check for other groups form x6,x7,x8,x9,x10 based
> on max r and also the correlation matrix.
>
> Note that i have large number of variables. i don't need the groups to
> overlap i will have divided in to disjoint groups but maintaining the
> order.
> kindly assist me see how i can get this done, thanks
>
>      On Thursday, November 13, 2014 1:50 PM, Cox Lwaka
> <clwaka at yahoo.com> wrote:
>
>
>  I have a bit of trouble here to program in r. I am anew user but i
> really enjoy working with it.I have a large number of variables in a
> matrix that are arranged sequentially on a line (chromosome). This
> order has to be maintained whatsoever. I am to develop an r algorithm
> that will develop groups as follows;i) Calculate the correlation
> between successive variables and correlation matrix for all the
> variables
> ii) if r(i) is the maximum correlation coefficient in the successive
> variable correlation then my first group has variables [x(i-k ),
> ...x(i),... x(i+k )]. this gives me group one of size 2k+1. note that
> variables are picked on that line and order is maintained.iii) we check
> for remaining correlation btn successive variables relative to the
> bigger correlation matrix and select  other groups. these groups don't
> need to be of same size and they must not overlap.i will have divided
> in to disjoint groups but maintaining the order.kindly assist me see
> how i can get this done, thanks
>
>
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

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