🚀 go-pugleaf

     I would like to report a bug which occurs as a result of certain
interactions between Emacs and Mathematica.  I think the bug is probably
in Emacs, but am unsure, so I am sending copies to people involved with
both programs.

     I am in the habit of running mathematica under Emacs, as the 
editing features and parenthesis checking make it much nicer than
it would be to run mathematica directly.  

     Here is how I trigger the bug.

     Start up Emacs, then do ESC-x shell<cr> to start a command shell.
Wait for the shell to come up, then type math<cr> to start
mathematica.  I have done this much thousands of times, with no
problem.  Next, I want to put a matrix into my mathematica program --
the first matrix from the file readin, which is appended below.  So I
change to that file, kill the first three lines of the file (with
CNTRL-K), yank them back, go to the shell, type "m642=", yank the
three lines out again, type ";", and hit RETURN.  At this point Emacs
beeps and the message "not found" appears in the minibuffer, which is
strange as I did not ask it to search for anything, but is also not a
problem.  Then I go back into the file readin, kill the three lines
which constitute the second matrix, yank them back, type "m743=", yank
the three lines out again, type ";", and press RETURN.  This is when
Emacs freaks out.  It goes into some kind of a loop where it is
continually beeping and saying "not found" in the minibuffer.  I can't
stop it except by getting out of the program.

     Thank you for your time.

				William Jockusch

Below is what the shell looks like when Emacs goes into the loop:
******
mesg: cannot change mode
stag:jockusch% math
Mathematica 2.2 for SPARC
Copyright 1988-93 Wolfram Research, Inc.
 -- Terminal graphics initialized --

In[1]:= m642 = {{32 + 56*x + 32*x^2 + 9*x^3 + x^4,
    32 - 50*x^2 - 20*x^3 - 2*x^4},
   {-24 - 34*x - 11*x^2 - x^3, -24 - 10*x + 23*x^2 + 10*x^3 + x^4}};

In[2]:= m743 = {{96 + 148*x + 64*x^2 + 13*x^3 + x^4,
    120 + 92*x - 42*x^2 - 15*x^3 - x^4},
   {-48 - 62*x - 15*x^2 - x^3, -96 - 76*x + 32*x^2 + 13*x^3 + x^4}};
*******
Incidentally, I have no idea what the mesg: cannot change mode
is referring to.
Below is the file readin:
*******
{{32 + 56*x + 32*x^2 + 9*x^3 + x^4, 
    32 - 50*x^2 - 20*x^3 - 2*x^4}, 
   {-24 - 34*x - 11*x^2 - x^3, -24 - 10*x + 23*x^2 + 10*x^3 + x^4}}

{{96 + 148*x + 64*x^2 + 13*x^3 + x^4, 
    120 + 92*x - 42*x^2 - 15*x^3 - x^4}, 
   {-48 - 62*x - 15*x^2 - x^3, -96 - 76*x + 32*x^2 + 13*x^3 + x^4}}