++, +=, -=, etc. do not operate on indexed variables, e.g.
++x(1);  x(2:3) += 4;  are not allowed.  They should be.
Also,  y = x(2:3) = [ 1 2];  produces y = x, not y=[1 2].
Indexing should also be allowed on expressions and strings.


CTRL/C interrupt should set a flag.  The flag should be tested at safe
points to abort.  But how about within a large mat multiply?  Maybe
a flag should be set, to disable ctrl/c, by routines doing critical
linked-list pointer manipulation.

Add functions:

for reading a vector from a file, x = read("file.dat")  ???

Finish:

history editing

Note in M.DOC those functions available only when YYDEBUG
and/or DEBUG compile flags used.

***

5/12/94

BUG--- when the parser fails in compiling a function, the function
is still left in the symbol table.  List the function -> core dump