Set how zero cells are printed in the output of umxACE

[tbates]

In #15, @mcneale requested the ability to set how zero cells are printed in the output of umxACE etc.

Turns out previous me solved this request back in 2012 :-)
The default is "." for clarity, but you can set zero.print="whatever you want")

e.g.:

require(umx)
data(twinData) # ?twinData set from Australian twins.
# Pick the variables
selDVs = c("bmi1", "bmi2")
mzData <- twinData[twinData$zygosity %in%  "MZFF", ]
dzData <- twinData[twinData$zygosity %in% "DZFF", ]
m1 = umxACE(selDVs = selDVs, dzData = dzData, mzData = mzData)

-2 × log(Likelihood)
'log Lik.' 9659.215 (df=4)

Standardized solution

	a1	c1	e1
bmi1	0.86	.	0.51

umxSummaryACE(m1, std= FALSE, zero.print="mike")

Raw solution

	a1	c1	e1
bmi1	0.84	mike	0.49