z %% 2 == 1
has 12 logical values. What do you expect R to do with it worth respect to 4
rows?
--
Sent from my phone. Please excuse my brevity.
On May 30, 2016 11:38:46 AM PDT, Carl Sutton via R-help
wrote:
>Hi Guru's
>In my quest to understand R I have what I thought was a simple exercise
Hi Guru's
In my quest to understand R I have what I thought was a simple exercise that
now has me baffled. Why the error message after running this code? I am
totally baffled by the error message. I was expecting rows 1 and 3 of the x
matrix to be returned, and have not a clue as to why this
This is not an igraph issue, I believe. You need to go over your
indices and update the matrix, i.e.
for (i in seq_along(t.list)) { temp[t.list[i], c.list[i]] <-
temp[t.list[i], c.list[i]] + 1 }
Best,
Gabor
On Tue, Aug 2, 2011 at 4:50 PM, Robinson, David G wrote:
> I realize that matrix indexin
I realize that matrix indexing has been addressed in various flavors, but I'm
stumped and didn't find anything in the archives. It's not clear if it is an
igraph issue or a more general problem. Thanks in advance for your patience.
I am using igraph to read a gml file
(http://www-personal.umic
Thank you all once again .. Yeah, its working now.
--
Regards,
Mahalakshmi
Graduate Student
#20, Department of Geography
Michigan State University
East Lansing, MI 48824 Quoting Liviu Andronic :
> On Wed, Dec 22, 2010 at 6:39 PM, wrote:
>> Thank you both for your suggestions. I have anothe
Have you consulted R's extensive documentation? -- in particular, "An
Introduction to R," which would seem like an obvious place for R
newbies to start. If you had done so, you would have found your
question answered there in section 6.1 on lists.
-- Bert Gunter
On Wed, Dec 22, 2010 at 9:39 AM,
On Wed, Dec 22, 2010 at 6:39 PM, wrote:
> Thank you both for your suggestions. I have another question - is there a
> specific way to access the individual elements of a 'list' variable? i.e.
>
> dmi = matrix(rnorm(20),4,5)
> soi = matrix(rnorm(20),4,5)
> pe = matrix(rnorm(20),4,5)
> y <- list(dm
Thank you both for your suggestions. I have another question - is there a
specific way to access the individual elements of a 'list' variable? i.e.Â
dmi = matrix(rnorm(20),4,5)
soi = matrix(rnorm(20),4,5)
pe = matrix(rnorm(20),4,5)
y <- list(dmi, soi, pe)
y[[1]]Â Â gives
[,1]Â Â Â Â Â Â [,2
On Wed, Dec 22, 2010 at 2:57 AM, Phil Spector wrote:
> To make your loop work, you need to learn about the get function.
> I'm not going to give you the details because there are better
> approaches available.
> First, let's make some data that will give values which can be verified.
> (All the c
To make your loop work, you need to learn about the get function.
I'm not going to give you the details because there are better
approaches available.
First, let's make some data that will give values which can
be verified. (All the correlations of the data you created
are exactly equal to 1.)
Hi,
I am having trouble with matrices. I have 2 matrices as given below, and I am
interested in using these matrices inside "for" loops used to calculate
correlations. I am creating a list with the names of the matrices assuming this
list could be indexed inside the 'for' loop to retrieve the
Dear Murali,
Here is one way:
set.seed(123)
a <- matrix(abs(rnorm(100)), 10)
b <- rnorm(10)
apply(a,2,function(x) ifelse(b>quantile(b,probs=0.75),-x,x))
HTH,
Jorge
On Wed, Nov 5, 2008 at 11:30 AM, <[EMAIL PROTECTED]> wrote:
> Folks,
>
> I have a matrix:
>
> set.seed(123)
> a <- matrix(rn
you almost have it, e.g., check the following:
set.seed(123)
a <- matrix(rnorm(100), 10)
b <- rnorm(10)
ind <- b > quantile(b, 0.75)
a[ind, ] <- -a[ind, ]
a
I hope it helps.
Best,
Dimitris
[EMAIL PROTECTED] wrote:
Folks,
I have a matrix:
set.seed(123)
a <- matrix(rnorm(100), 10)
And a v
Folks,
I have a matrix:
set.seed(123)
a <- matrix(rnorm(100), 10)
And a vector:
b <- rnorm(10)
Now, I want to switch the signs of those rows of a corresponding to
indices in b whose values exceed the 75 %-ile of b
which(b > quantile(b)[4])
[1] 2 6 10
so I want, in effect:
a[2, ] <- -a[2,
Rory Winston wrote:
> Hi
>
> Does anyone know how I might pick out diagonal elements of a matrix using a
> vector?
>
> If I create a matrix a:
>
> a <- matrix(c(1:16), 4, byrow=TRUE)
>
> and I want to pick out the elements (1,1),(2,2),(3,3), or another arbitrary
> diagonal (upper or lower), is ther
On Sat, 2008-04-12 at 10:56 +0100, Rory Winston wrote:
> Hi
>
> Does anyone know how I might pick out diagonal elements of a matrix using a
> vector?
>
> If I create a matrix a:
>
> a <- matrix(c(1:16), 4, byrow=TRUE)
Not sure if this does all that you describe below, but:
diag(a)
and you can
On 4/12/2008 5:56 AM, Rory Winston wrote:
> Hi
>
> Does anyone know how I might pick out diagonal elements of a matrix using a
> vector?
>
> If I create a matrix a:
>
> a <- matrix(c(1:16), 4, byrow=TRUE)
>
> and I want to pick out the elements (1,1),(2,2),(3,3), or another arbitrary
> diagonal
Hi
Does anyone know how I might pick out diagonal elements of a matrix using a
vector?
If I create a matrix a:
a <- matrix(c(1:16), 4, byrow=TRUE)
and I want to pick out the elements (1,1),(2,2),(3,3), or another arbitrary
diagonal (upper or lower), is there any way I can use a vector to do thi
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