Added special-case logical-indexing function * logical-index.h (New file) : Logical-indexing function. May be called on octave_value types via call_bool_index * nz-iterators.h : Add base-class nz_iterator for iterator types. Array has template bool for whether to internally store row-col or compute on the fly Add skip_ahead method which skips forward to the next nonzero after its argument Add flat_index for computing octave_idx_type index of current position (with assertion failure in the case of overflow) Move is_zero to separate file * ov-base-diag.cc, ov-base-mat.cc, ov-base-sparse.cc, ov-perm.cc (do_index_op): Add call to call_bool_index in logical-index.h * Array.h : Move forward-declaration for array_iterator to separate header file * dim-vector.cc (dim_max): Refers to idx-bounds.h (max_idx) * array-iter-decl.h (New file): Header file for forward declaration of array-iterator * direction.h : Add constants fdirc and bdirc to avoid having to reconstruct them * dv-utils.h, dv-utils.cc (New files) : Utility functions for querying and constructing dim-vectors * idx-bounds.h (New file) : Utility constants and functions for determining whether things will overflow the maximum allowed bounds * interp-idx.h (New function : to_flat_idx) : Converts row-col pair to linear index of octave_idx_type * is-zero.h (New file) : Function for determining whether an element is zero * logical-index.tst : Add tests for correct return-value dimensions and large sparse matrix behavior

--- a/libinterp/octave-value/ov-base-mat.cc	Mon Jul 14 13:07:59 2014 -0600
+++ b/libinterp/octave-value/ov-base-mat.cc	Fri Jul 25 13:39:31 2014 -0600
@@ -34,6 +34,7 @@
 #include "ov-base-mat.h"
 #include "ov-base-scalar.h"
 #include "pr-output.h"
+#include "logical-index.h"
 
 template <class MT>
 octave_value
@@ -146,15 +147,20 @@
 
     case 1:
       {
-        idx_vector i = idx (0).index_vector ();
-
-        if (! error_state)
+        if (idx(0).is_bool_type ())
+          retval = call_bool_index (matrix, idx(0));
+        else
           {
-            // optimize single scalar index.
-            if (! resize_ok && i.is_scalar ())
-              retval = cmatrix.checkelem (i(0));
-            else
-              retval = MT (matrix.index (i, resize_ok));
+            idx_vector i = idx (0).index_vector ();
+
+            if (! error_state)
+              {
+                // optimize single scalar index.
+                if (! resize_ok && i.is_scalar ())
+                  retval = cmatrix.checkelem (i(0));
+                else
+                  retval = MT (matrix.index (i, resize_ok));
+              }
           }
       }
       break;