Re: read-only variable

[Igor Schein <igor@txc.com>]

On Wed, Aug 25, 2004 at 01:13:20PM -0700, Ilya Zakharevich wrote:
> On Tue, Aug 24, 2004 at 05:50:18PM -0400, Igor Schein wrote:
> > Hi,
> > 
> > I propose a function protect(var), which would make variable var
> > write-protected for the duration of the session to guard against
> > accidental over-writing.  Is it easy to implement?
> 
> Is not it "the same" as a function without parameters?

True.  However, you have the same problem in this case.  Let's say you
type 

a()=1

in the beginning of the session.  Then, several days and several
thousand input lines later, you forget what you did in the beginning
and type

a()=2

I'd be curious to find out if any other mathematical package offers
variable protection feature.  I really feel it's very useful for
interactive sessions.  

Igor