R help - Jul 2013 - nth root of matrix

Hi all,

I want to do the following:

a=matrix(c(-1,-2,-3))
a^(1/3) #get 3rd root of numbers[,1]

[1,]  NaN
[2,]  NaN
[3,]  NaN


All I get is NaNs, what is the proper way of doing this? Would like to
retain the fact that it is a matrix if possible (not a requirement
though).


Thanks,

Sachin

	[[alternative HTML version deleted]]

?sign(a)*abs(a)^(1/3)
#????????? [,1]
#[1,] -1.000000
#[2,] -1.259921
#[3,] -1.442250
A.K. 




----- Original Message -----
From: Sachinthaka Abeywardana <sachin.abeywardana at gmail.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Tuesday, July 2, 2013 11:11 PM
Subject: [R] nth root of matrix

Hi all,

I want to do the following:

a=matrix(c(-1,-2,-3))
a^(1/3) #get 3rd root of numbers[,1]

[1,]? NaN
[2,]? NaN
[3,]? NaN


All I get is NaNs, what is the proper way of doing this? Would like to
retain the fact that it is a matrix if possible (not a requirement
though).


Thanks,

Sachin

??? [[alternative HTML version deleted]]

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On Jul 2, 2013, at 8:11 PM, Sachinthaka Abeywardana wrote:
> Hi all,
> 
> I want to do the following:
> 
> a=matrix(c(-1,-2,-3))
> a^(1/3) #get 3rd root of numbers[,1]
> 
> [1,]  NaN
> [2,]  NaN
> [3,]  NaN
> 
> 
> All I get is NaNs, what is the proper way of doing this? Would like to
> retain the fact that it is a matrix if possible (not a requirement
> though).
?complex

 a=matrix(c(-1+0i,-2+0i,-3+0i))


David Winsemius
Alameda, CA, USA