Displaying 4 results from an estimated 4 matches for "creatematrix".
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create_matrix
2012 Dec 05
1
RInside, rcpp compilation problem
...ide.h header file references the rcpp.h header file, which is not included with RInclude download. This is the sample code provided in one of the RInside manuals:
#include <iostream>
#include <RInside.h> // for the embedded R via RInside
rcpp::NumericMatrix createMatrix(const int n) {
Rcpp::NumericMatrix M(n,n);
for (int i=0; i<n; i++) {
for (int j=0; j<n; j++) {
M(i,j) = i*10 + j;
}
}
return(M);
}
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2007 Nov 16
2
expand.grid overflows?
>cbn<-as.matrix(expand.grid( rep( list(0:1), 50)))
Error in rep.int(rep.int(seq_len(nx), rep.int(rep.fac, nx)), orep) :
invalid 'times' value
In addition: Warning message:
In rep.int(rep.int(seq_len(nx), rep.int(rep.fac, nx)), orep) :
NAs introduced by coercion
But I'm only interested in cbn matrix rows where:
cbn<- cbn[rowSums(cbn)==5,]
Is there a way to evaluate it
2007 Feb 22
4
Sorting rows of a binary matrix
Hallo,
The command:
x <- 3
mat <- as.matrix(expand.grid(rep(list(0:1), x)))
generates a matrix with 2^x columns containing the binary representations
of the decimals from 0 to (2^x-1), here from 0 to 7. But the rows are not
sorted in this order.
How can sort the rows the ascending order of the decimals they represent,
preferably without a function which converts binaries to decimals
2007 Jul 27
4
Looping through all possible combinations of cases
Hello!
I have a regular data frame (DATA) with 10 people and 1 column
('variable'). Its cases are people with names ('a', 'b', 'c', 'd',
'e', 'f', etc.). I would like to write a function that would sum up
the values on 'variable' of all possible combinations of people, i.e.
1. I would like to write a loop - in such a way that it