Displaying 20 results from an estimated 10000 matches similar to: "sig for R and C++"
2010 Jun 18
2
nchar( NA )
Hello,
Is this expected ?
> nchar( c( "", NA ) )
[1] 0 2
Should not the second one be NA ?
Romain
--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
|- http://bit.ly/98Uf7u : Rcpp 0.8.1
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2010 Jun 09
1
Highlighting Text in Console
Anyone know how I can highlight specific words/letters (e.g., bold, or
different colour) when displaying text to the console using cat or
equivalent?
I can change e.g., the colour for everything by loading in a new
Rconsole file, but what I really want to do is write "hello world" to
the screen but with the word "world" highlighted in some way.
I've searched the
2010 Jun 09
1
minor tick marks
Hi !
I need a plot for data extending over several orders of magnitude on the y axis.
The following command generates a nice looking semi-log plot for my data:
plot(x,y,log="y",type="l",lty=3, ylim=c(0.01,2),yaxp=c(0.01,1,1),las=1)
I would appreciate having also minor tick marks in-between the 3 major ticks obtained with the above command. The "minor.tick" function
2010 Jun 15
1
Error when callin g C-Code
Hi
when I call the function below in R, i get the error: Object 'pairlist'
can't be converted to 'double'.
#include <R.h>
#include <Rdefines.h>
#include <Rmath.h>
SEXP CSimPoisson(SEXP lambda, SEXP tgrid, SEXP T2M, SEXP Ni, SEXP NT)
{
double sign, EVar;
double *xlambda, *xtgrid, *xT2M, *xNi, *xNT, *xtau;
SEXP tau;
int ltgrid =0;
int i = 0;
int j = 0;
2010 Jun 19
2
Call by reference or suggest workaround
I have written code to compute multi-indices in R [1] and due to the
recursive nature of the computation I need to pass around the *same*
matrix object (where each row corresponds to one multi-index). As pass
by reference wasn't the default behavior I declared a global matrix
(mat) and used the <<- operator to write to the global matrix. So the
usage would be to call genMultiIndices(3,2)
2010 Jul 05
2
nested for loops
Dear Admin,
I will appreciate if you advise me an effective way to write the following R
code including nested for loops. I cannot do it by using expand.grid
function because it results with memory allocation problems.
Thanks for your time and consideration.
for(d1 in 0:n){
for(d2 in 0:n){
for(d3 in 0:n){
for(d4 in 0:n){
for(d5 in 0:n){
for(d6 in 0:n){
for(d7 in 0:n){
for(d8 in 0:n){
for(d9 in
2010 Jul 26
1
O/T good c/c++ code for LU decomposition
Dear R People:
Could someone recommend a good c/c++ code (or Fortran) for LU
decomposition, please?
Sorry to bother about this. I'm trying to do some "non-R" work that
requires a matrix inversion.
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
2010 Jun 18
3
C interface
Greetings,
I am trying to call simple C-code from R.
I am on Windows XP with RTools installed.
The C-function is
#include <R.h>
#include <Rinternals.h>
#include <Rmath.h>
#include <Rdefines.h>
// prevent name mangling
extern "C" {
SEXP __cdecl test(SEXP s){
SEXP result;
PROTECT(result = NEW_NUMERIC(1));
double* ptr=NUMERIC_POINTER(result);
double t =
2010 Jul 09
2
Defining a method that behaves like '$'?
Hi,
is there a way to define a method say '$$' that would behave like '$'
and allow calls like 'a$$name'?
Thanks.
Renaud
--
Renaud Gaujoux
Computational Biology - University of Cape Town
South Africa
###
UNIVERSITY OF CAPE TOWN
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2012 Mar 15
4
replicating C example from the Extensions Manual problem
Dear R People:
Here is something that I am sure is very simple. I'm just trying to
re-create the C convolution example in the Extensions manual. Here is
the subroutine:
void convolve(double *a, int *na, double *b, int *nb, double *ab)
{
R_len_t i, j, nab = *na + *nb - 1;
for(i = 0; i < nab; i++)
ab[i] = 0.0;
for(i = 0; i < *na; i++)
for(j = 0; j < *nb; j++)
ab[i + j] += a[i] *
2012 Mar 16
1
a question about writing C extensions to functions
Dear R People:
I'm not sure if I should ask this here or in Rcpp, but I thought I'd
start here first.
If I'm writing a C program, when do I know to use SEXP vs. int or float, please?
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
2013 Jan 09
1
R2html and Blackboard LMS : solved
Everything is ok on Firefox, IE, and iPad.
Thanks,
Erin
On Tue, Jan 8, 2013 at 7:58 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:
> Dear R People:
>
> Has anyone used R2HTML in web files that were on the Blackboard LMS, please?
>
> I'm starting to do these but wanted to know if there were any
> potential pitfalls.
>
> Thanks,
> Erin
>
>
> --
2017 Aug 17
1
really dumb question with building/creating a new package.
Thank you!
On Thu, Aug 17, 2017 at 4:55 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:
> r-package-devel is probably a better place to post this, especially if
> you do not get a satisfactory reply here. This list is about R
> programming, as you presumably know; your query is not.
>
> Cheers,
> Bert
>
>
> Bert Gunter
>
> "The trouble with having
2010 Aug 06
1
r sig for tcl/tk?
Dear R People:
Is there an R sig for Tcl/Tk, please?
I looked at the User Groups list on the main page and didn't see one.
However, I thought I'd double check.
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
2019 Mar 04
1
Problem with compiling OpenBLAS to work with R
>>>>> Erin Hodgess
>>>>> on Fri, 1 Mar 2019 12:30:35 -0700 writes:
> Yay! I re-installed everything and got through "Make
> distribution"! I have one more question, please: I am
> running the make check-all. I have an error at reg-1d.
> It stops the process. However, the mean difference (as
> per the file) is
2010 Dec 17
4
using ls() to find a function
Dear R People:
Is there a way to find which objects are functions via ls(), please?
I'm sure that there is, but I'm not sure how.
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
2017 Dec 21
3
Building R from source with the PGI compiler
Hello
I would like to build R from source and use the PGI compiler, rather than
the GCC compiler.
I saw the instructions for the Intel compiler in the R Installation Manual,
but I didn't see the PGI. I tried a few times without instructions, but
without success.
Any suggestions would be most welcome. Also, I hope this is the right
group for the question.
Sincerely,
Erin
--
Erin
2010 Nov 13
2
R on an iPad
Dear R People:
Is it possible to run R on an iPad, please?
For some reason, I'm thinking that you can't have Fortran, C, etc., so
you can't do it.
But I thought I would check anyway.
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
2011 Oct 19
3
converting string fractions to numerics
Dear R People:
Suppose I have the following:
"pi/2"
and I would like it to be 1.57.....
Using as.numeric, here is my result:
> as.numeric("pi/2")
[1] NA
Warning message:
NAs introduced by coercion
>
Is there a way to produce the numeric result, please?
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of
2010 Jun 21
3
tables
Dear R People:
I have generated the following table:
> table(zza$DEATH,zza$GENDER)
F M
2009-04-21 0 1
2009-04-22 4 2
2009-04-24 6 0
2009-04-25 1 3
2009-04-26 2 0
2009-04-28 3 0
2009-04-29 2 2
However, instead of total counts in the F and M columns, I would like percents.
How would I do this, please?
thanks,
Erin
--
Erin