Tweak version checks around broadcasting for Octave

Chebfun only supports Octave >= 11 so there is no need for a specific
version check on Octave.

Author: cbm755

@chebfun/dimCheck.m

@@ -1,10 +1,11 @@
 function out = dimCheck(f, g, ~)
 %DIMCHECK   Check dimension compatibility of two CHEBFUN objects.
-%   In MATLAB 2016a and below DIMCHECK(F, G) returns:
+%   The behaviour depends on whether "broadcasting" is suppported.
+%   Without broacasting (e.g., MATLAB <= 2016a) DIMCHECK(F, G) returns:
 %       1    if numColumns(F) == numColumns(G)
 %     error  otherwise.
 %
-%   In MATLAB 2016b and above DIMCHECK(F, G) returns:
+%   With brodcasting (e.g., MATLAB >= 2016b) DIMCHECK(F, G) returns:
 %       1    if numColumns(F) == numColumns(G)
 %      -1    if numColumns(F) == 1 or numColumns(G) == 1
 %     error  otherwise.
@@ -29,8 +30,8 @@
 end
 
 % Adjust for MATLAB version if out = -1:
-if ( (out == -1 ) && verLessThan('matlab', '9.1') )
-   out = 0; 
+if ( (out == -1 ) && ~is_octave() && verLessThan('matlab', '9.1') )
+   out = 0;
 end
 
 if ( out == 0 && nargin == 2 )

tests/chebtech/test_minus.m

@@ -72,20 +72,20 @@
     g = testclass.make(g_op, [], pref);
     pass(n, 16:17) = test_sub_function_and_function(f, f_op, g, g_op, x);
 
-    % This should fail with a dimension mismatch error.
-    % (Actually, we can do this in R2016a anda above!)
+    % This used to fail with a dimension mismatch error.
+    % (But we can do this in R2016a and later b/c of broadcasting)
     g_op = @(x) sin(x);
     g = testclass.make(g_op, [], pref);
-    try 
+    try
         h = f - g; %#ok<NASGU>
         pass(n, 18) = false;
-        if ( verLessThan('matlab', '9.1') )
+        if ( ~is_octave() && verLessThan('matlab', '9.1') )
             pass(n, 18) = false;
         else
             pass(n, 18) = true;
         end
     catch ME
-        if ( verLessThan('matlab', '9.1') )
+        if ( ~is_octave() && verLessThan('matlab', '9.1') )
             pass(n, 18) = strcmp(ME.identifier, 'MATLAB:dimagree');
         else
             pass(n, 18) = false;

tests/chebtech/test_plus.m

@@ -73,19 +73,19 @@
     g = testclass.make(g_op, [], pref);
     pass(n, 16:17) = test_add_function_to_function(f, f_op, g, g_op, x);
 
-    % This should fail with a dimension mismatch error.
+    % Used to fail with a dimension mismatch error before broadcasting was added
     g_op = @(x) sin(x);
     g = testclass.make(g_op, [], pref);
-    try 
+    try
         h = f + g; %#ok<NASGU>
         pass(n, 18) = false;
-        if ( verLessThan('matlab', '9.1') )
+        if ( ~is_octave() && verLessThan('matlab', '9.1') )
             pass(n, 18) = false;
         else
             pass(n, 18) = true;
         end
     catch ME
-        if ( verLessThan('matlab', '9.1') )
+        if ( ~is_octave() && verLessThan('matlab', '9.1') )
             pass(n, 18) = strcmp(ME.identifier, 'MATLAB:dimagree');
         else
             pass(n, 18) = false;