Let me repeat an important topic from the the posting guide: it would be
helpful for us to see a toy example, i.e. code to generate data for x.
Best wishes,
Uwe Ligges
Josh B wrote:
Hello R list subscribers,
I am trying to use the "by" command to create line-specific variance covariance matrices
(where "x" is the original data matrix):
by(x, x$line, function(d) {
d.clean <- d[,-1]})
write.table(d.clean$line[1,1], sep = ",", file = "covariances.csv", col.names =
FALSE, row.names = FALSE, append = TRUE)
write.table("", sep = ",", file = "covariances.csv", col.names = FALSE,
row.names = FALSE, append = TRUE)
x.cov <- cov(d.clean, y= NULL, use= "complete.obs", method= c("pearson"))
})
When I run this code, I get an error:
by(x, x$line, function(d) {
+ d.clean <- d[,-1]})
Error in names(IND) <- deparse(substitute(INDICES))[1] :
'names' attribute [1] must be the same length as the vector [0]
Any suggestions on how to improve my code? Thanks in advance.
Sincerely, Josh
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
