Hello,
I don't have MATLAB here so this is completely untested but the help
page for readMat says:
Arguments
|con|
Binary |connection
<http://127.0.0.1:11101/library/base/html/connections.html>| to which
the MAT file structure should be written to. A string is interpreted as
filename, which then will be opened (and closed afterwards).
So it should recognize a filename and open it as a binary connection. If
it doesn't, try
adj_con <- file(pathnames_adj, open = "b")
mat_adj <- readMat(adj_con)
[...etc...]
close(adj_con)
Hope this helps,
Rui Barradas
Em 14-08-2012 12:54, jer...@kosta.ch escreveu:
Dear users,
I am stucked with a programming problem: I am trying to download a squared adjacency matrix
from matlab with only 0 or 1. Doing it without a loop at first, I get an error message that
is, I think, related to the "mat_adj<-readMat(pathnames_adj)" line. Did
anybodz encouter already that problem? If so, do I need to change anything in my code in
order it not to be recurrent? If I run the code a second time, it works fine, but this does
not help me, as I try to set up a loop for 265 matlab adj matrix, each number representing a
specific week and the purpose being to have metrics from igraph being generated over the 265
weeks.
Thank you
CODE to read the file:
rm(list=ls())
library(R.matlab)
path<-setwd("V:/2012/nonweighted_GOVSOV")
pattern_adj<-sprintf("weightmatrix1.mat")
pathnames_adj<-list.files(pattern=pattern_adj,path=path,full.names=T)
cat("Reading MAT file: ", basename(pathnames_adj), "\n", sep="")
mat_adj<-readMat(pathnames_adj)
adj<-do.call(rbind,mat_adj)
library(igraph)
g<-graph.adjacency(adj, mode=c("directed"), weighted=T)
_______________________________________________________________________
R RESPONSE:
path<-setwd("V:/2012/nonweighted_GOVSOV")
pattern_adj<-sprintf("weightmatrix1.mat")
pathnames_adj<-list.files(pattern=pattern_adj,path=path,full.names=T)
cat("Reading MAT file: ", basename(pathnames_adj), "\n", sep="")
Reading MAT file:
mat_adj<-readMat(pathnames_adj)
Error in file(con, open = "rb") : invalid 'description' argument
adj<-do.call(rbind,mat_adj)
Error in do.call(rbind, mat_adj) : object 'mat_adj' not found
library(igraph)
Attaching package: ‘igraph’
The following object(s) are masked from ‘package:R.oo’:
hierarchy
g<-graph.adjacency(adj, mode=c("directed"), weighted=T)
Error in inherits(adjmatrix, "Matrix") : object 'adj' not found
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