Displaying 13 results from an estimated 13 matches for "columnames".
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2009 Jul 15
4
Extract pairs (rowname, columname) from a matrix where value is 0
Dear sir,
I have a matrix like
a<-matrix(c(0,2,0,4,0,6,5,8,0),nrow=3)
colnames(a)<-c("F1","F2","F3")
rownames(a)<-c("A1","A2","A3")
a
F1 F2 F3
A1 0 4 5
A2 2 0 8
A3 0 6 0
I want to extract all pairs (rownames, columnames) from which the value in
the matrix is 0
The result should be something like this
A1, F1
A2, F2
A3, F1
A3, F3
how it is possible?
thanks for your help....
Best Regards
Alberto
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2012 May 25
1
columnames changes behaviour of formula
Hello. precompiled R-2.15.0, svn58871, macosx 10.7.4.
I have discovered that defining column names of a dataframe can alter the
behaviour of lm():
d <- c(4,7,6,4)
x <- data.frame(cbind(0:3,5:2))
coef(lm(d~ -1 + (.)^2,data=x))
X1 X2 X1:X2
-1.77 0.83 1.25
R>
R>
OK, so far so good. But change the column names of 'x' and the behaviour
changes:
colnames(x) <-
2009 Jun 25
2
variable driven summary of one column
Hello,
how can I get a variable driven summary of one column of my data.frame?
Usually I would do
> summary(data$columnname) to get a summary of column named
"columnname" of my data.frame named "data".
In my case the columnname is not static but can be set dynamically.
So I save the chosen columname in something like
variable <- "columnname"
but how can I
2006 Jun 20
0
inplace assignment: solution
...> data.frame[some.condition & another.condition, big.list.of.columns] * 2 + 55
>
> or anything else. Equally, there could be any method of subsetting, or
> any expression that can be an assignment target, on the left hand
> side:
>
> data.frame[[some.complex.expression.for.columnames]]
> <-data.frame[[some.complex.expression.for.columnames]] * 333 + foo *
> 56
>
> rownames(matrix)[45:53] <- paste(rownames(matrix)[45:53], "blah")
>
>
> David
>
> On 16/06/06, Adaikalavan Ramasamy <ramasamy at cancer.org.uk> wrote:
> > I do no...
2011 Sep 23
1
Newbie question: Converting Table
Hi,
I'm new to R, and I have searched helpfiles and this forum on my 2
questions. Hope you guys can help me out! :-)
Many thanks in advance!
Cheers,
Lars
Q1: I imported a csv file with columnames subject and class. There are about
1000 different classes...
It looks like this:
subject1, class1
subject1, class2
subject2, class1
subject2, class3
...
subject999, class1
subject999, class2
Now I want to transform this in R into a table (with columnnames
subject,class1,class2,...) like:
subject1...
2006 Mar 22
2
has_many, belongs_to
I have one table(profiles) where each row has many rows in another
table(carriers).
If I write profile.carriers I get a collection containing all carriers
that belong to the current profile.
My question is: how do I sort the collection profile.carriers? I would
like to sort it on one of the columns (found in the table carriers). Can
I override some method in the carrier model or somewhere
2003 Nov 12
4
column extraction by name ?
I have a data frame (df) with colums x, y and z.
e.g. df <- data.frame(x = sample(4), y = sample(4), z = sample(4))
I can extract column z by: df$z or df[3]
I can also extract columns x,y by: df[1:2] or by df[-3].
Is it possible to extract x,y columns in a "symbolic" fashion i.e.
by equivalent of df[-z] (which is illegal) ???
Or alternativeley, is there an equivalent of
2006 Jan 03
0
newbie question about .titlecase of .titleize
i just started to work with ROR, and made a form with scaffolding.
I achieved to add some extra inputvalidation but i also want to add some
code that changes some specific textfields with the .titlecase /
.titleize and then stores it to the database.
I had to add the validation code to the model file, is this also the
place to add the titlecase ?
the columname of the regarding textfield is
2003 Feb 17
1
R environment advice?
Hello,
My questions are meant to be not necessarily specific...I am looking for
advice and best practices for setting up an R environment. Here's my
situation:
I am one of perhaps three or four individuals who will be analyzing the
same data through the use of R. I would like to set up a "base"
environment for our project, basically some scripts that connect to a
database, load
2013 Apr 08
1
qgraph: correlation matrix variable names
We aim to visualize a 17*17 correlation matrix with the package *qgraph*,
consisting of 16 variables.
Without variable names in the input file, that works perfectly
R> qgraph(data)
but we'd like variable names instead of numbers for variables.
In a correlation matrix, the first row and the first column usually have
variable names. We've been unsuccessful so far to read such a file
2007 Oct 14
5
Ruby/Informix 0.6.1 released
This is a maintenance release to fix a bug triggered while working
with Ruby on Rails and Informix.
Web site: http://ruby-informix.rubyforge.org
Changelog:
0.6.1 13/10/2007
------------------
Bugs fixed:
* Database#columns was returning an empty array from within
the
Informix ActiveRecord adapter
(ActiveRecord::ConnectionAdapters::InformixAdapter#columns)
if
2008 May 15
2
Adding columns to dataframe
Hi,
I have a dataframe SDF1 that looks like this:
Char1 Char2 Char 3 W.2007.02 W.2007.09 W.2007.16 W.2008.13
A C1 F1 F2 F3
A C2
F4
B C3 F5
F6
I have another dataframe SDF2 with 163 cols that has the following column
names
Char1 Char2 Char 3 W.2007.02 W.2007.03 W.2007.04
2009 Jun 29
5
Help
HiĀ group,
I found a module for adaptive kernel density estimation for Stata users, but unfortunetly I don't have access to Stata, can I find a similar approach using R?
Thank u so much 4 ur time.
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