Deprecate nfields and replace with numfields. * NEWS: Announce deprecation of nfields and addition of new function numfields. * container.txi: Add numfields to the manual. * oct-map.cc (octave_map::cat): Change %!tests to use numfields. * ov-struct.cc (Fnumfields): Function renamed from nfields. * scripts/deprecated/nfields.m: Add m-file which warns about nfields deprecation. * scripts/deprecated/module.mk: Add nfields.m to build system. * fieldnames.m: Change seealso link to point to numfields. * __isequal__.m: Use numfields to simplify code. * imwrite.m: Replace 'isempty (fieldnames (fmt))' with 'numfields (fmt) > 0' for clarity. * imageIO.m: Replace 'isempty (fieldnames (fmt))' with 'numfields (fmt) > 0' for clarity. * importdata.m: Use numfields to simplify code. * assert.m: Use numfields to simplify code.

--- a/scripts/general/fieldnames.m
+++ b/scripts/general/fieldnames.m
@@ -33,7 +33,7 @@
 ## When the input is a Java object @var{javaobj} or Java classname
 ## @var{jclassname} the name are the public data elements of the object or
 ## class.
-## @seealso{nfields, isfield, orderfields, struct, methods}
+## @seealso{numfields, isfield, orderfields, struct, methods}
 ## @end deftypefn
 
 function names = fieldnames (obj)