Hi everyone,
suppose I have a 2D matrix, is there a command to snip out a specific
row/column and then remerge the remaining columns/rows back into a
contiguous matrix? I will need to repeat this operation quite a
bit(reverse selection).
Thanks for any insights you can offer.
Yifei
From: metal_lical...@live.com
To: r-help@r-project.org
Subject: About Matrix
Date: Tue, 28 Apr 2009 11:28:43 +0300
Hi, Dear R users,
I have a question:
I have A matrix which is 11519X14
and B matrix which is 1764X14,
How do I get C matrix which is The remaining matrix after removing
Hello everyone,
I have a couple of fairly simple questions (I hope) the answers to which I
cannot find through the documentation at the moment.
1. I would like to delete the a row from a matrix if a certain elimination
criterion is met. I am familiar with x <- x[-7,] (to remove row 7, for
e
use the '-' feature.
>mat <- matrix(rnorm(100), nrow = 10)
#snip the second row
>mat[-2,]
#snip the third column
>mat[,-3]
#snip rows 5 and 7
>mat[-c(5,7),]
cheers
tc
On 10/23/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hi everyone,
>
> suppose I have a 2D matrix, is there a command to
Matrices are not made of paper! :) If you index a matrix with negative
numbers, you'll get back that matrix minus that column or row.
A quick example:
>a<-matrix(c(1:9),ncol=3) # Create a sample matrix
>a# Display it
[,1] [,2] [,3]
[1,]147
[2,]2
Dear fellow R-users,
Say we have a matrix x, defined as follows
set.seed(50)
x <- matrix(rbinom(100*5,1, p=0.75),nrow=100, ncol=5)
Now the interpretation of x is that each for of x is actually a sequence of
length 5, and i would like to transform x in such a way that I can describe the
frequen
Try this:
For the first and the second question:
transform(subset(d, row.names(d) != 2), row.names=NULL)
On Thu, Jun 11, 2009 at 3:53 PM, Payam Minoofar wrote:
> Hello everyone,
>
> I have a couple of fairly simple questions (I hope) the answers to which I
> cannot find through the documentati
On Jun 11, 2009, at 2:53 PM, Payam Minoofar wrote:
Hello everyone,
I have a couple of fairly simple questions (I hope) the answers to
which I cannot find through the documentation at the moment.
1. I would like to delete the a row from a matrix if a certain
elimination criterion is met
> -Original Message-
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of David Winsemius
> Sent: Thursday, June 11, 2009 1:49 PM
> To: Payam Minoofar
> Cc: r-help@r-project.org
> Subject: Re: [R] Matrix manipulation
>
>
&g
On 6/11/09 2:13 PM, "William Dunlap" wrote:
> -Original Message-
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of David Winsemius
> Sent: Thursday, June 11, 2009 1:49 PM
> To: Payam Minoofar
> Cc: r-help@r-project.org
Or perhaps:
M10[rowSums(M10 == 63) == 0, ]
On Thu, Jun 11, 2009 at 4:49 PM, David Winsemius wrote:
>
> On Jun 11, 2009, at 2:53 PM, Payam Minoofar wrote:
>
>> Hello everyone,
>>
>> I have a couple of fairly simple questions (I hope) the answers to which I
>> cannot find through the documentation
On Tue, 1 Sep 2009, Gregory Gentlemen wrote:
Dear fellow R-users,
Say we have a matrix x, defined as follows
set.seed(50)
x <- matrix(rbinom(100*5,1, p=0.75),nrow=100, ncol=5)
Now the interpretation of x is that each for of x is actually a sequence
of length 5, and i would like to transform
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