Version 6.12   02/07/10

• Restore interpretation of 2D Curl(scalar) to be consistent with earlier versions (lost in 6.10).
• Eliminate a busy wait in Pause dialog.
• Corrects occasional failure of initial value smoothing pass (SMOOTHINIT).
• Modify parser "Illegal Symbol" report to list all legal symbols.
• Corrects "Bad Matrix Reference" error when using coupled value boundary conditions on inactive variables.
• Corrects implementation of CONST ARRAYs reference in domain definitions.
• Random number generator is initialized only on file opening, not on each parse.
• Corrects indexing errors when using both CONTACT and INACTIVE controls.

 Version 6.11   12/15/09

• Corrects a memory leak associated primarily with vector plots.
• Corrects an assertion error when lose dongle (or network) and retry.
• Rotating a 3D mesh plot erroneously rotated all elevation plot locators.
• Implements 1/complex and CLOG(complex).
• Corrects errors in finding proper evaluation cells across thin domain gaps.
• Corrects an error in computing the block-inverse preconditioner in systems with symmetric coupling matrices.

 Version 6.10   11/10/09

• Corrects an error in evaluation of integrals involving parameterized definitions.
• Corrects an error in the export of time dependent Techplot files.
• Corrects the expansion of expressions containing the product of complex parameters and complex variables.
• Add facility to bypass automatic update checks.
• Additional plot error diagnostics.
• Diagnoses and rejects TABLEs with duplicated coordinate points.
• Improved error diagnostics in expression evaluation.
• Corrects an error in the processing of cascaded definitions (i.e. A=B=expression).
• Corrects an occasional error in ELEVATION plots on boundary curves in 3D.
• Corrects an error in handling of ARRAYs and MATRIXs loaded by element definitions, e.g. A=ARRAY[n], A[1]=1.

 Version 6.09   09/10/09

• Restores consistency with version 5 in the sign of ELEVATION plots of NORMAL on interior boundaries.
• Assures that boundary conditions on boundary paths will take precedence over boundary conditions on surfaces in 3D.
• Diagnoses bad region references in building 3D domains.
• Corrects errors in applying boundary conditions to INACTIVE variables.
• Support for display of version 3 plot files.
• Diagnoses mesh generation catastrophes due to near miss coordinates.
• Corrects the implementation of "STAGED (a BY b TO c)"
• Allow white space separators in STAGED lists (comma is now optional).
• Corrects errors in the implementation of CONTACT boundaries in 1D problems.
• Corrects an error (introduced in v6.04) that disabled the staging of ERRLIM.

 Version 6.08   07/01/09

• Added capability to communicate through a proxy server for update checks and internet key licensing. See the "Help | Web Proxy Settings" menu.
• Corrects and error in "Pause" control under Linux.
• Corrects diagnosis of 0/0 in evaluator.
• Corrects an indexing error in natural boundary conditions with sequenced equations.
• Update status panel at fixed time intervals (reduces panel flashing on fast problems.)
• Corrects application of boundary conditions to paths on specified surfaces in 3D.

 Version 6.07   05/25/09

• Corrects errors in memory usage report when scripts are re-run.
• Reports license features of network dongles, even when connected as local dongle.
• CONST ARRAY and CONST MATRIX store numbers rather than formulas. Allows generation of RANDOM arrays and matrices.
• Corrects an error in EXPORT of ELEVATION (array) with no VS qualifier.
• Implements "SELECT RANDOM_SEED=integer" to control random number generator.
• Sorts CRITICAL time list.
• Improved diagnostic for arithmetic errors in TIME_INTEGRALs.
• Defers printer connection to point of need, to avoid slow startup in systems with faulty printer specifications.
• Implements "SELECT DEBUG(GRID)" to aid in diagnosing mesh generation difficulties.
• Corrects an error that bypassed mesh density induction in closely spaced extrusion surfaces.
• Corrects an error in gridding 3D boundaries with sharp hidden breaks in surface slope.

 Version 6.06   04/16/09

• Added capability for XCOMP, YCOMP and ZCOMP to work with POINTs.
• EXPORT of MATRIX plot now uses matrix dimensions for table size.
• Corrects use of global MESH_SPACING and MESH_DENSITY controls.
• Corrects various errors in COMPLEX expression evaluation.
• Corrects errors in "View File" progress bar and hot keys.
• Corrects error in BATCH rerun.
• Corrects error in "Save As" of non-pde files.
• Corrects occasional crash on program close.

 Version 6.05   03/26/09

• Test for "disk full" errors while writing a PG6 output file.
• Added capability to stop the reading of a PG6 "view" file.
• Correct font sizes on some Linux platforms.
• Added capability for a CRITICAL time list.
• Added MODE_SUMMARY plot selector for compatibility with version 5 in eigenvalue problems.
• Corrects occasional errors in identifying duplicate plot domain specifications.
• Corrects occasional errors in locating positions in curved cells in 3D.
• Corrects occasional "Can't match prior cells" error.
• Corrects implementation of NATURAL boundary conditions in 1D Cylindrical and 1D Spherical models (area weighting factor had been omitted).

 Version 6.04   02/20/09

• Corrects an error in treatment of default error limit when ERRLIM is referenced but not defined.
• Corrects an occasional error in treatment of explicitly defined vectors in 2D problems.
• Corrects treatment of "New File" creation - new file is now displayed correctly.
• SUMMARY report for eigenvalue problems now sorts global and modal values.
• VIEW of graphic files now allows selection of plot time from a drop-down list.
• Corrects occasional crash in reporting errors on Linux platforms.

 Version 6.03   02/05/09

• Corrects an occasional error in SAVE operations with multiple threads.
• Adds capability for plotting CONTOURS and SURFACES on a deformed mesh.
• Adds labels for the second plot function in dual-contour plots.
• Abandons attempts to apply timestep controls to steady-state equations in time-dependent problems.   (Use SELECT SS_TIMECHECK to restore behavior of earlier versions.)

 Version 6.02   01/23/09

• Corrects an error in the -T command line switch for selecting default thread count.
• Modifies the logic of controlling matrix re-computation in nonlinear time-dependent problems, replaces the NRMATRIX switch with REMATRIX and restores version 5 switches PREFER_SPEED and PREFER_STABILITY.
• Corrects a threading error in SAVE and EVAL functions that caused data corruption with multiple threads.
• Corrects student-mode operation of the demonstration version.
• Corrects a memory protection fault when a plot mesh was empty.
• Corrects the import of version 5 transfer files.
• Corrects an error in the Jacobian matrix for variable dependence on integrals on imbedded features.
• Corrects occasional errors reading configuration and license files.
• Corrects an error that reset log file timestamps to zero after 24 hours of run time.

 Version 6.01   01/09/09

• Corrects and error in automatic update checking.
• Corrects an intermittent error in rewriting license file.
• Corrects an intermittent error in startup of time dependent problems with initial timestep much too large.

 Version 6.00   01/02/09

FlexPDE Version 6 is a major rewrite of the FlexPDE application.

Among the new features of FlexPDE version 6 in the initial release are:

• Multithreading - Support for dual and quad core processors. Run multiple problems simultaneously or use up to 4 threads for parallel execution within a single problem.
• Complex, Vector and Array Variables and Equations - Direct support of these data types simplifies equation construction.
• Regionally Inactive Variables - Variables can be declared inactive in some regions and active in others.
• Multiple Equation Sets - Splitting of equations into sets that are solved sequentially and alternately.
• Additional Status Graphs - Updated graphical interface to include plots of cell/node number, error, convergence and timestep.
• Internal Tabulation Facility - Build on-the-fly tables of computationaly intensive parameters for more economical execution.
• Arrays and Matrices - Extended support allows array and matrix operations for use in equations, graphics and domain construction.
• Planes, Cylinders, Spheres - Simplified Construction of Planes, Cylinders and Spheres in 3D.
• Stop and Restart Facility - Simplified facility for restarting a script after stopping.
• Web-based Licensing - Move license from machine to machine with web actions. No dongle to loose!