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Ox 7.1: new features and fixes

New features and enhancements in version 7.1
Fixed problems in version 7.1

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New features and enhancements in version 7.1

• OS X
  • command line version of Ox Professional now is 64-bit and multi-threaded, so supporting parallel loops. Note that the Ox version called from OxMetrics and OxRun is still 32-bit, because the GUI is still 32-bit.
  • OxMetrics now disables AppNapp for OxModel, OxPack and OxRun at start-up.
• Handling of computations involving empty matrices improved to be more intuitive. (Some of these changes may impact existing code.)
  • x*y' returns <> if y is empty (to conform to x*z when z is empty), previously it gave a run-time error;
  • outer(<>,y) returns <> (rather than give a run-time error)
  • determinant(<>) returns 0
  • logdet(<>) returns -.Inf with signdet 0
  • logdet(singular matrix) returns -.Inf with signdet 0 (was 1 with signdet 0)
  • shape(x, y, r, c) and reshape(x, y, r, c) return an r x c matrix of zeros when x or y is empty or r,c is zero.
  • nullspace(<>) returns <>, nullspace(full rank m x m) returns zeros(m,0), nullspace(zeros(m,0)) returns an identity matrix.
• Linux:
  • Removed linux GLIBC dependencies on version 2.14 and 2.17 (Debian Wheezy is still on 2.13 while RHEL 6 is on 2.12).
  • Removed dependency on GLIBCXX_3.4.14.
  • OxMetrics was using the user locale, instead of the C locale. For many languages, this meant using the , as decimal separator instead of the . This in turn messed up display and saving of floating point numbers. Now using the C locale, as the console versions already did.
  • Producing some debian packages for installation now as well.
• Now can use lambda function in callback (FOxRunCallBack)
• `Warning: assignment in test expression' now not given if assignment is in parenthesis: if (a = b) gives warning if ((a = b)) and if ((a = c) >= 0) do not give warnings anymore.
• MaxSQP/MaxSQPF: hi,lo parameters can be scalar: in that case same value is used for all parameters.
• Improved decisions when to do A*B and A'B in parallel.
• rank() could create run-time error when matrix has missing values. Now a warning, returning rank 0.
• New responsive html help (using iframes instead of frames).

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Fixed problems in version 7.1:

• OSX OxEdit Add/Remove Modules/Load From: crash.
• foreach loops on arrays were accessing the items by reference rather than value. This could lead to errors when the array item is changed in the loop, such as: decl amres_hs = {1,unit(2),unit(3)}, h, i, j; foreach (h in amres_hs[i]) { amres_hs[i] = h + i * 10; h += 1; println(">>h?", h); } println(amres_hs); This is now safe.
• foreach was not allowed on variables that were const or serial. The following resulted in compilation error: 'amH' cannot take reference of constant: decl jac_alphabeta = [=](const amH) { decl mj = <>, h, i; foreach (h in amH[i]) { } };
• MaxSQP/MaxSQPF if error in argument, would just print function name rather than the full run-time error message before stopping
• j = sscan("AA:5", "%*t", ":", "%d", &i); should have j=1 (not j=2) %* means skip the assignment, and such fields should not be counted. They were, however, for %t,%v,%C.
• If a data member of an object holds a function reference, this would be called with the wrong number of arguments, leading to a runtime error.
• find when searching for a string inside an array: defaulted to reverse search and ignored mode argument. When searching for a string inside a string it was always using reverse search, regardless of the mode.
• Base class in class declaration did not handle namespace correctly. Now in class A : B { ... } B defaults to the namespace in which it resides (or ::B for the global namespace, or N::B for namespace N if in the global namespace).
• clone was not preserving the pubic flag when copying an array (making it by value). If a member was an object, clone would lose its public or static property after copying the object.
• Database::FindSelection should not give an error message when a variable is not found
• Problem with println("S\xF8ren"); and println("Søren");
  • On the Windows console: depends on the active code page (chcp).
  • in OxEdit: skips quite a bit of output after that.
  Can make the Windows console UTF-8 by using chcp 65001 and the Lucinda Console font, then correct in both. So best solution is for OxEdit/OxMetrics to treat all files with upper ASCII as UTF-8, not just files with characters > 0xFF.
• A do {...} while loop as the very first executable code in a function can go wrong because an invalid optimization makes the returning jump statement out by one position in the code. Example: #include <oxstd.h> test(a, c) { decl b;//;=0; do { b = a; ++c; } while (c < 0); println(b); } main() { test(10, -2); } prints 1 instead of 10.
  If the first statement is decl b = 0;, then there is executable code before the do statement, and the issue does not arise.
• An indexation error in a function call argument would be reported at the wrong location.
• OS X OxEdit packaging error: has RunOnce with both files.
• If the number of arguments of a function declaration does not match a previous declaration, it could crash Ox, rather than give a compilation error.
• replace("%", "", "_"); gets stuck in infinite loop
• static member variables could lead to a crash when an object was used in a parallel loop (solved by creating a new global lock).
• Refactoring of gamma function code, small change in DGammaRatio_22.
• Autometrics: Backward elimination did not consider the empty model.

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Ox version 7.10. © JA Doornik

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