On 08/30/2011 12:06 AM, Bert Gunter wrote:
Jim et. al:
This is the second time I've seen this advice recently. Use logical
indexing: which(), though not wrong, is superfluous:
x[ !x %in% c(0,255)] will do, rather than:
By golly, you're right, and it works even if x is a logical vector. I
But that is a good reason to always use parentheses:
x[ !(x %in% c(0,255))]
since some of the 'precendences' vary between languages.
On Tue, Aug 30, 2011 at 4:47 AM, Jim Lemon j...@bitwrit.com.au wrote:
On 08/30/2011 12:06 AM, Bert Gunter wrote:
Jim et. al:
This is the second time I've
chuan_zl wrote:
Dear All.
I am Chuan. I am beginner for R.I facing some problem in remove
element from
vector.I have a vector with size 238 element as follow(a part)
[1] 0 18 24 33 44..[238] 255
Let the vector label as x,I want remove element 0 and 255.I
Jim et. al:
This is the second time I've seen this advice recently. Use logical
indexing: which(), though not wrong, is superfluous:
x[ !x %in% c(0,255)] will do, rather than:
If you want to remove the specific values 0 and 255 from your vector, try:
x-x[-which(x %in% c(0,255))]
Jim
--
Thank you friend for suggestion.
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Thank you very much,friend.
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Thank you very much,friend.
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Thank you very much,friend.
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-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Bert Gunter
Sent: Monday, August 29, 2011 7:07 AM
To: Jim Lemon
Cc: r-help@r-project.org
Subject: Re: [R] Asking Favor For Remove element with Particular Value In
Vector
You can use 'which' and negative subscripts to remove elements from a vector.
y-x[-(which(x==0|x==255))]
chuan_zl wrote:
Dear All.
I am Chuan. I am beginner for R.I facing some problem in remove element
from vector.I have a vector with size 238 element as follow(a part)
[1] 0 18
Be careful about negating the 'which' in case there are no matches:
x - 1:10
x[-which(x == 11)]
integer(0)
Notice it deletes the whole vector.
Safer to use logical vectors:
x[!(x==3 | x == 7)]
[1] 1 2 4 5 6 8 9 10
x[!(x == 11)] # notice this works
[1] 1 2 3 4 5 6 7 8 9
Dear All.
I am Chuan. I am beginner for R.I facing some problem in remove element from
vector.I have a vector with size 238 element as follow(a part)
[1] 0 18 24 33 44..[238] 255
Let the vector label as x,I want remove element 0 and 255.I try use
such function:
Not sure whether I understand your question right but here is what I would do:
# Sample data
x - seq( 1, 100, by=6)
x
[1] 1 7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97
# remove element with value 19
x - x[ x != 19 ]
x
[1] 1 7 13 25 31 37 43 49 55 61 67 73 79 85 91 97
If you want to
On Aug 27, 2011, at 5:31 AM, chuan_zl wrote:
Dear All.
I am Chuan. I am beginner for R.I facing some problem in remove
element from
vector.I have a vector with size 238 element as follow(a part)
[1] 0 18 24 33 44..[238] 255
Let the vector label as x,I want
Here is one I wrote for the raster package. It searches a raster layer for
NA's and takes the median of the number of non NA adjacent cells determined
by neighbor count. You could turn your matrix into a raster to make it work
or change the code.
Hope you find it useful, Robert
neighbor.filter -
Hello,everybody. My name is Chuan Zun Liang. I come from Malaysia. I am just
a beginner for R. Kindly to ask favor about median filter. The problem I
facing as below:
x-matrix(sample(1:30,25),5,5)
x
[,1] [,2] [,3] [,4] [,5]
[1,]78 30 29 13
[2,]46 1259
[3,]
like a few packages available,
http://www.google.com/search?sclient=psyhl=enq=R+cran+median+filter
Date: Sun, 27 Mar 2011 07:56:11 -0700
From: chuan...@hotmail.com
To: r-help@r-project.org
Subject: [R] Asking Favor For the Script of Median
On Mar 27, 2011, at 10:56 AM, chuan_zl wrote:
Hello,everybody. My name is Chuan Zun Liang. I come from Malaysia. I
am just
a beginner for R. Kindly to ask favor about median filter. The
problem I
facing as below:
x-matrix(sample(1:30,25),5,5)
x
[,1] [,2] [,3] [,4] [,5]
[1,]7
-project.org
Subject: [R] Asking Favor For the Script of Median Filter
Hello,everybody. My name is Chuan Zun Liang. I come from Malaysia.
I am just
a beginner for R. Kindly to ask favor about median filter. The
problem I
facing as below:
x-matrix(sample(1:30,25),5,5)
x
[,1] [,2] [,3] [,4] [,5]
[1
?runmed
-- Bert
On Sun, Mar 27, 2011 at 2:44 PM, David Winsemius dwinsem...@comcast.net wrote:
On Mar 27, 2011, at 10:56 AM, chuan_zl wrote:
Hello,everybody. My name is Chuan Zun Liang. I come from Malaysia. I am
just
a beginner for R. Kindly to ask favor about median filter. The problem I
+median+filter
Did you find any that include a 2D median filter? All the ones I looked at
were for univariate data.
--
David.
Date: Sun, 27 Mar 2011 07:56:11 -0700
From: chuan...@hotmail.com
To: r-help@r-project.org
Subject: [R] Asking Favor
CC: chuan...@hotmail.com; r-help@r-project.org
From: dwinsem...@comcast.net
To: marchy...@hotmail.com
Subject: Re: [R] Asking Favor For the Script of Median Filter
Date: Sun, 27 Mar 2011 18:30:48 -0400
On Mar 27, 2011, at 1:07 PM
Hi
what exactly do you want.
You say you can read your data
x - read.jpeg(system.file(data, cat.jpg, package=rimage))
plot(x)
What do you mean by pixel image? By reading a picture you get an object
imagematrix
str(x)
imagematrix [1:420, 1:418, 1:3] 0.255 0.251 0.247 0.247 0.255 ...
-
Hi Chuan,
I'm forwarding your question to the list because I haven't used the
rimage package... It's best if you post questions to the list anyway
because you are more likely to get a fast and useful answer.
On 20 September 2010 23:03, chuan zun liang wrote:
Dear Michael:
I am so sorry,disturb
r-help@r-project.org
Sent: Wednesday, 15 September 2010 16:08:20
Subject: Re: [R] Asking Favor
Hello Chuan,
If you just want a matrix with the numbers 1 to 64 arranged by row...
m - matrix(1:64, ncol=8, byrow=TRUE)
But perhaps I don't understand your question properly ?
Michael
On 16
Dear Prof:
My name is Chuan.I from Malaysia.I am a beginner for R.I need favor for Prof.
This is my data:
Hello Chuan,
If you just want a matrix with the numbers 1 to 64 arranged by row...
m - matrix(1:64, ncol=8, byrow=TRUE)
But perhaps I don't understand your question properly ?
Michael
On 16 September 2010 12:46, chuan zun liang chuan...@yahoo.com.my wrote:
Dear Prof:
My name is Chuan.I
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