OpenMx Developer Forums

As we begin to get comments, I think we may be surprised at how rapidly our tutorials tend to move relative to the general public of SEM'ers. We run the risk of turning people off before they even begin.

We spoke about this before, but, as Bill pointed out recently, having blocks of code that cannot be evaluated (and that appears to be ending in commas) is going to be a source of confusion for users. Unless we place those pieces of code in the context of a large function call--by showing that large function call as one unit before the other pieces (and possibly referring to line numbers, which can be turned on)--we should probably just make use of variables in R.

We also have some irregular usage of semicolons in the documentation that needs addressed.

The code below grabs the first 6 variables from myFADataRaw as manifest, but then provides the full n=9-variable covariance matrix to the mxModel

It runs, and gives no warning that half the variables are not modelled. Would be very helpful to say
"variables x-y are included in the covariance matrix, but do not appear in your model!"

or something similar?

########## reduction ##########

require(OpenMx)
data(myFADataRaw); myData = myFADataRaw;
manifests = names(myData)[1:6] # Just the first 6
#[1] "x1" "x2" "x3" "x4" "x5" "x6"
latents = c("G")

factorModel = mxModel(

Hi all,
Currently, the example on the front page doesn't work out of the box, because.

demoData = read.csv("demoOneFactor.csv", header=TRUE)
# cannot open file 'demoOneFactor.csv': No such file or directory

Just because it's so obvious on the home page, I think a lot of people will copy and paste it in, so it would be nice if it ran...

I can't see a datafile in the package called "demoOneFactor.csv"

Using the ability of R to access the web, we could do:
read.csv("http://openmx.psyc.virginia.edu/data/demoOneFactor.csv", header = TRUE)

playing with this

> mxMatrix("Stand", cov2cor(matrix(c(10,9,9,15), nrow=2)), name="Y")
Error in row(tmp) :
a matrix-like object is required as argument to 'row/col'
In addition: Warning messages:
1: In if (is.na(nrow)) { :
the condition has length > 1 and only the first element will be used
2: In if (nrow != ncol) { :
the condition has length > 1 and only the first element will be used