Changes in OpenMx

Release 0.2.4-1038

  • definition variables can now be used inside algebra expressions
  • definition variables inside of MxMatrices will populate to the 1st row before conformability checking. In plain english: you do not need to specify the starting values for definition variables.
  • the square-bracket operator when used in MxMatrix labels is no longer restricted to constants for the row and column. The row and column arguments will accept any term that evaluates to a scalar value or a (1 x 1) matrix.
  • summary() on a model returns a S3 object. Behaves like summary() in stats package.
  • eliminated UnusualLabels.R test case. Too many problems with windows versus OS X versus linux.
  • implemented vech() and vechs() functions: half-vectorization and strict half-vectorization
  • fixed bug in ordinal FIML when # of data columns > # of thresholds
  • added ‘frontendTime’ and ‘backendTime’ values to summary() output. They store the elapsed time of a model in the R front-end and C back-end, respectively.
  • created a name space for the OpenMx library. Only mx**() and omx**() functions should be exported to the user, plus several miscellaneous matrix functions and S4 generic functions.
  • corrected ‘observedStatistics’ output of summary() to exclude definition variables
  • corrected ‘observedStatistics’ output of summary() count the number of equality constraints

Release 0.2.3-1006

  • added ‘vector’ argument to mxFIMLObjective() function. Specifies whether to return the likelihood vector (if TRUE) or the sum of log likelihoods (if FALSE). Default value is FALSE.
  • renamed omxCheckEquals() to omxCheckIdentical(). omxCheckIdentical() call “identical” so that NAs can be compared.
  • added checking of column names of F and M matrices in RAM objective functions.
  • added ‘dimnames’ argument to mxRAMObjective() function. Populates the column names of F and M matrices.
  • added square bracket operator to MxAlgebra expressions. A[x,y] or A[,y] or A[x,] or A[,] are valid.
  • square bracket operator supports row and column string arguments.
  • mxModel(remove=TRUE) accepts both character names or S4 named entities.
  • added support for x86_64 on OS X 10.6 (snow leopard)
  • fixed support for x86_64 on Ubuntu 9.10 (gcc 4.4)
  • throw error message when inserting a named entity into a model with an identical name
  • added Anthony William Fairbank Edwards “Likelihood” (1972; 1984) A, B, O blood group example to online documentation

Release 0.2.2-951

  • omxGraphviz() either prints to stdout or to a filename
  • updated omxGraphviz() to draw an arrow if (value != 0 || free == TRUE || !
  • omxGraphviz() returns a character string invisibly
  • error checking for bogus definition variables
  • summary() uses matrix dimnames by default, use options(‘mxShowDimnames’=FALSE) to disable
  • added support for gcc 4.4 (Ubuntu 9.10) on x86 and x86_64 architectures
  • created R documention for omxGraphviz() function
  • generalized dependency specification for objective functions (omxObjDependencies)
  • fixed cross-reference links in User Guide

Release 0.2.1-922

  • checked observed data for dimnames on ML objective functions
  • using dimnames= argument to mxMLObjective() and mxFIMLObjective() propagates to MxMatrix objects on output.
  • bug fix for error message where model name is incorrect
  • updated user guide in response to feedback from beta testers
  • incremented version number to 0.2.1-922 to sync demos and user guide

Release 0.2.0-905

  • several of the twin model demo examples have been recoded.
  • fixed bug with non-floating point matrices.
  • more error checking for mxPath().
  • tools/ will convert Mx 1.0 algebra expressions (Python PLY library is required).
  • renamed “parameter estimate” column to “Estimate” and “error estimate” to “Std.Error” in summary().
  • added ‘dimnames’ argument to mxFIMLObjective() and mxMLObjective().
  • error checking for RAM models with non-RAM objective functions.

Release 0.1.5-851

  • improved error messages on unknown identifier in a model (beta tester issue)
  • fixed bug in mxMatrix() when values argument is matrix and byrow=TRUE
  • implemented square-bracket substitution for MxMatrix labels
  • fixed a bug in computation of omxFIMLObjective within an algebra when definition variables are used
  • significant alterations to back-end debugging flags
  • tweaked memory handling in back-end matrix copying
  • added support for x86_64 linux with gcc 4.2 and 4.3

Release 0.1.4-827

  • added checking and type coercion to arguments of mxPath() function (a beta tester alerted us to this)
  • moved matrices into submodels in UnivariateTwinAnalysis_MatrixRaw demo
  • added Beginners Guide to online documentation
  • mxRun() issues an error when the back-end reports a negative status code
  • named entities and free or fixed parameter names cannot be numeric values
  • constant literals are allowed inside mxAlgebra() statements, e.g. mxAlgebra(1 + 2 + 3)
  • constant literals can be of the form 1.234E+56 or 1.234e+56.
  • type checking added to mxMatrix arguments (prompted by a forum post)
  • mxPath() issues an error if any of the arguments are longer than the number of paths to be generated
  • data frames are now accepted at the back-end
  • FIML ordinal objective function is now working. Still a bit slow and inelegant, but working
  • FIML ordinal now accepts algebras and matrices. dimnames of columns must match data elements
  • implemented free parameter and fixed parameter substitution in mxAlgebra statements
  • implemented global variable substitution in mxAlgebra statements
  • turned off matrix and algebra substitution until a new proposal is decided
  • snow and snowfall are no longer required packages
  • added cycle detection to algebra expressions
  • mxEval() with compute = TRUE will assign dimnames to algebras
  • added dimnames checking of algebras in the front-end before optimization is called
  • added ‘make rproftest’ target to makefile

Release 0.1.3-776

  • mxEvaluate() was renamed to mxEval() after input from beta testers on the forums.
  • new function mxVersion that prints out the current version number (beta tester request).
  • When printing OpenMx objects, the @ sign is used where it is needed if you would want to print part of the object (beta tester request).
  • now supports PPC macs.
  • implemented AIC, BIC and RMSEA calculations.
  • mxMatrix documentation now talks about lower triangular matrices (beta tester request).
  • fixed bugs in a number of demo scripts.
  • added chi-square and p-value patch from beta tester Michael Scharkow.
  • added comments to demo scripts.
  • fixed a bug in the quadratic operator (a beta tester alerted us to this).
  • means vectors are now always 1xn matrices (beta tester request).
  • added an option “compute” to mxEval() to precompute matrix expressions without going to the optimizer.
  • Matrix algebra conformability is now tested in R at the beginning of each mxRun().
  • named entities (i.e. mxMatrices, mxAlgebras, etc.) can no longer have the same name as the label of a free parameter. (This seems obscure, but you will like what we do with it in the next version!)
  • can use options(mxByrow=TRUE) in the R global options if you always read your matrices in with the byrow=TRUE argument. Saves some typing. (beta tester request)
  • fixed the standard error estimates summary.
  • added mxVersion() function to return the version number (as a string).

Release 0.1.2-708

  • Added R help documentation for omxCheckCloseEnough(), omxCheckWithinPercentError(),

    omxCheckTrue(), omxCheckEquals(), and omxCheckSetEquals()

  • (mxMatrix) Fixed a bug in construction of symmetric matrixes.
    • now supports lower, standardized, and subdiagonal matrices.

Release 0.1 (August 3, 2009)

  • (mxEvaluate) mxEvaluate translates MxMatrix references, MxAlgebra references, MxObjectiveFunction references, and label references.

  • (mxOptions) added ‘reset’ argument to mxOptions()

  • (mxPath) renamed ‘start’ argument of mxPath() to ‘values’
    • renamed ‘name’ argument of mxPath() to ‘labels’
    • renamed ‘boundMin’ argument of mxPath() to ‘lbound’
    • renamed ‘boundMax’ argument of mxPath() to ‘ubound’
    • eliminated ‘ciLower’ argument of mxPath()
    • eliminated ‘ciUpper’ argument of mxPath()
    • eliminated ‘description’ argument of mxPath()
  • (dimnames) implemented dimnames(x) for MxMatrix objects
    • implemented dimnames(x) <- value for MxMatrix objects
    • implemented dimnames(x) for MxAlgebra objects
    • implemented dimnames(x) <- value for MxAlgebra objects
  • (mxMatrix) added ‘dimnames’ argument to mxMatrix()

  • (mxData) renamed ‘vector’ argument of mxData() to ‘means’