
Date: 14 January 1983 06:05-EST
From: Richard Pavelle <RP @ MIT-MC>
Subject:  GR10
To: INFO-TENSOR @ MIT-MC

Many of you on this list do not work in relativity but if
some of your colleagues have used MACSYMA for relativity
applications please forward the following to them:

Lars Hornfeldt and his colleagues at Stockholm would like
to get together a list of papers for the 10th International
Conference on General Relativity and Gravitation this July
in Padova. The papers are to be those which have used MACSYMA
for General Relativity and I am trying to collect them for
Hornfeldt. If you have published any, or if you have any in 
preprint form, send them or the references to me. 

Thanks.


Date: 20 November 1982 16:44-EST
From: Richard Pavelle <RP at MIT-MC>
Subject: RATRIEMAN
To: INFO-TENSOR at MIT-MC

At ASB's suggestion, for consistency, I have changed RATRIEMAN to RATRIEMANN 
in CTENSR. 

Date: 2 July 1982 13:58-EDT
From: Richard Pavelle <RP at MIT-MC>
To: INFO-TENSOR at MIT-MC
cc: RP at MIT-MC

I have revised the tensor manual, TM-167 (June 1980), to reflect
some changes and additions to the CTENSR and ITENSR packages. If
you wish to receive a copy let me know.

Date: 5 April 1982 01:02-EST
From: Jeffrey P. Golden <JPG at MIT-MC>
To: LAParker.Gravity at MIT-MULTICS
cc: MULTICS-MACSYMA-BUGS at MIT-MC

   Date: 4 April 1982 18:45 est
   From: LAParker.Gravity at MIT-MULTICS
   To: Multics-Macsyma-Bugs at MIT-MC
   [1] why did  loadfile(etensr,fasl,dsk,share)
   not load as macsyma manual says it should? What do I do?
The manual was written before the current Multics Macsyma even existed.
On Multics you can get the package which is now called "ctensr" by doing:
	loadfile(">udd>Mathlab>macsyma>share>ctensr.lisp");

   [2] Following macsyma reference manual, p.191-192, I typed tsetup(),
   but only got the reply	tsetup()
   rather than what the manual shows.
On Multics you have to do the loadfile listed in [1] above before typing 
tsetup();.

Date: 24 March 1982 17:55-EST
From: V. Ellen Golden <ELLEN at MIT-MC>
Subject: More ITENSR stuff
To: CWH at MIT-MC, GJC at MIT-MC, RP at MIT-MC
cc: ELLEN at MIT-MC, JPG at MIT-MC

It appears to get ITENSR working on Multics we need also to compile
TENSOR; CANTEN 6
	GENER 50
	SYMTRY 100
on Multics.  Since there are called from itensr.

>udd>Mathlab>macsyma>share>itensr.demo1

gets an error:

lisp:function allfiles rejected argument ((dsk tensor) symtry fasl)

Date: 24 March 1982 17:33-EST
From: V. Ellen Golden <ELLEN at MIT-MC>
To: RP at MIT-MC
cc: ELLEN at MIT-MC, JPG at MIT-MC

    Date: 24 March 1982 11:38-EST
    From: Richard Pavelle <RP at MIT-MC>

        Date: 24 March 1982 11:13-EST
        From: Carl W. Hoffman <CWH at MIT-MC>
        No, it is just called itensr.  
        If you do "cwd >udd>Mathlab>Macsyma>share"
        (or just "cwd >udd>mal>a>share"), then you can type "list" to list the
        contents of the directory.  (Of course this is less obvious than typing
        control-F, but what can you do with a loser like Multics.)
    I tried LOADFILE(">udd>Mathlab>macsyma>share>itensr") and this is ok. Then
    BATCH(">udd>Mathlab>macsyma>share>itensr.demo1") etc bombs out because
    each ITENSR demo has a command to LOADFILE(ITENSR,FASL). Can you edit this
    line out of each demo or tell me how to do it?
---------------------------------
I edited a copy of each demo file here on MC and retransferred them to Multics.
Now, when I attempt to demo these files, they appear to work until (for
demo1, e.g.) up to the line 

CANFORM(EXP);

at which point it gets an error:

lisp:function allfiles rejected argument ((dsk tensor) symtry fasl)

which I gather means we need to transfer (and compile) some more files.

Date: 24 March 1982 11:38-EST
From: Richard Pavelle <RP at MIT-MC>
To: ELLEN at MIT-MC
cc: RP at MIT-MC, JPG at MIT-MC

    Date: 24 March 1982 11:13-EST
    From: Carl W. Hoffman <CWH at MIT-MC>
        Date: 23 March 1982 23:47-EST
        From: V. Ellen Golden <ELLEN>
        To:   CWH
        cc:   RP, JPG, ELLEN, GJC
        RE ITENSR... what is the proper file spec for the compiled version of
        ITENSR?  My guess would be ">udd>Mathlab>macsyma>share>itensr.fasl"
        but Multics is not always that obvious... is this correct?
    No, it is just called itensr.  If you do "cwd >udd>Mathlab>Macsyma>share"
    (or just "cwd >udd>mal>a>share"), then you can type "list" to list the
    contents of the directory.  (Of course this is less obvious than typing
    control-F, but what can you do with a loser like Multics.)
I tried LOADFILE(">udd>Mathlab>macsyma>share>itensr") and this is ok. Then
BATCH(">udd>Mathlab>macsyma>share>itensr.demo1") etc bombs out because
each ITENSR demo has a command to LOADFILE(ITENSR,FASL). Can you edit this
line out of each demo or tell me how to do it?

Date: 23 March 1982 20:40-EST
From: Richard Pavelle <RP at MIT-MC>
To: JPG at MIT-MC
cc: RP at MIT-MC, ELLEN at MIT-MC, CWH at MIT-MC

       Date: 23 March 1982 03:39-EST
       From: Jeffrey P. Golden <JPG at MIT-MC>
       CWH tells me that ITENSR has been compiled on Multics.  Load it up and 
       see if it works.
   Date: 10 March 1982 10:56-EST
   From: V. Ellen Golden <ELLEN at MIT-MC>
   To: GJC at MIT-MC
   cc: BUG-MULMAX at MIT-MC
   I moved TENSOR;ITENSR > over to Multics as
   >udd>Mathlab>macsyma>share>itensr.lisp and when I attempt to loadfile
   it it gets
   "Call to an undefined function '?macsyma\-module' at Lisp level."
   Any ideas what that is about?
This bug is still there so I cannot test ITENSR.

Date: 24 March 1982 11:13-EST
From: Carl W. Hoffman <CWH at MIT-MC>
To: ELLEN at MIT-MC
cc: GJC at MIT-MC, JPG at MIT-MC, RP at MIT-MC

    Date: 23 March 1982 23:47-EST
    From: V. Ellen Golden <ELLEN>
    To:   CWH
    cc:   RP, JPG, ELLEN, GJC

    RE ITENSR... what is the proper file spec for the compiled version of
    ITENSR?  My guess would be ">udd>Mathlab>macsyma>share>itensr.fasl"
    but Multics is not always that obvious... is this correct?

No, it is just called itensr.  If you do "cwd >udd>Mathlab>Macsyma>share"
(or just "cwd >udd>mal>a>share"), then you can type "list" to list the
contents of the directory.  (Of course this is less obvious than typing
control-F, but what can you do with a loser like Multics.)

Date: 24 March 1982 00:26-EST
From: V. Ellen Golden <ELLEN at MIT-MC>
To: CWH at MIT-MC
cc: ELLEN at MIT-MC, RP at MIT-MC, JPG at MIT-MC, GJC at MIT-MC

    Date: 23 March 1982 23:47-EST
    From: V. Ellen Golden <ELLEN at MIT-MC>

    RE ITENSR... what is the proper file spec for the compiled version of
    ITENSR?  My guess would be ">udd>Mathlab>macsyma>share>itensr.fasl"
    but Multics is not always that obvious... is this correct?
-------------------------------
I just tried it and it is not correct.  NU?

Date: 23 March 1982 23:47-EST
From: V. Ellen Golden <ELLEN at MIT-MC>
To: CWH at MIT-MC
cc: RP at MIT-MC, JPG at MIT-MC, ELLEN at MIT-MC, GJC at MIT-MC

RE ITENSR... what is the proper file spec for the compiled version of
ITENSR?  My guess would be ">udd>Mathlab>macsyma>share>itensr.fasl"
but Multics is not always that obvious... is this correct?

Date: 23 March 1982 21:15-EST
From: Carl W. Hoffman <CWH at MIT-MC>
To: RP at MIT-MC, JPG at MIT-MC, ELLEN at MIT-MC, GJC at MIT-MC

    Date: 23 March 1982 20:40-EST
    From: Richard Pavelle <RP at MIT-MC>

       Date: 10 March 1982 10:56-EST
       From: V. Ellen Golden <ELLEN at MIT-MC>

       I moved TENSOR;ITENSR > over to Multics as
       >udd>Mathlab>macsyma>share>itensr.lisp and when I attempt to loadfile
       it it gets
       "Call to an undefined function '?macsyma\-module' at Lisp level."
       Any ideas what that is about?

    This bug is still there so I cannot test ITENSR.

No, that's a different bug.  The installed Macsyma doesn't know about
macsyma-module, so running interpreted system code won't work.  Try loading
the compiled file.

Date: 28 March 1982 13:36-EST
From: Jeffrey P. Golden <JPG at MIT-MC>
To: RP at MIT-MC, Unruh.QuantGR at MIT-MULTICS
cc: BUG-MULMAX at MIT-MC

    Date: 12 March 1982 10:15-EST
    From: Richard Pavelle <RP at MIT-MC>
        Date:  11 March 1982 18:55 est
        From:  Unruh.QuantGR at MIT-MULTICS
        In the CTENSR package on MULTICS MACSYMA , one cannot seem to
        enter a new metric . If I try tsetup() I get a message saying
        I must do a KILL(ALL). I KEEP GETTING THIS EVEN AFTER I DO A KILL(ALL)
    For the moment you will have to start up a fresh MACSYMA to enter a new
    metric.
has been fixed so starting up a new macsyma is no longer necessary.
(You have to do a KILL(ALL); and a TENSORKILL:TRUE$ as RP's comments 
dictate.)

Date: 28 March 1982 13:26-EST
From: Jeffrey P. Golden <JPG at MIT-MC>
To: RP at MIT-MC, Unruh.QuantGR at MIT-MULTICS
cc: BUG-MULMAX at MIT-MC, CWH at MIT-MC

   RP@MIT-MC 03/25/82 19:25:27 Re: Bug in ctensr on Multics
   To: JPG at MIT-MC
   CC: RP at MIT-MC, CWH at MIT-MC
       Date:  25 March 1982 17:21 est
       From:  Unruh.QuantGR at MIT-MULTICS
       coordinates [u,v,x,y], symmetric metric, with 1,2=a , 3,3=b , 4,4=b
       and depends(a,[x,y],b,[x,y]). I had the metric listed. After the metric
       was displayed,I got the message
        "Call to an undefined function 'true' at Lisp level."
                     Unruh under QuantGR on Multics.
   I ran this on MC without difficulty but it does bomb out on MULTICS:
   See RP;AA BUG.  Any suggestions? 
has been fixed.

Date: 27 March 1982 13:27-EST
From: V. Ellen Golden <ELLEN at MIT-MC>
Subject: Using MC
To: Unruh.QuantGR at MIT-MULTICS
cc: JPG at MIT-MC, ELLEN at MIT-MC, RP at MIT-MC

One possibility is to request ARPAnet access (or Chaos net access...
that is our local MIT net and I believe Multics is now connected to
it) to MC to go along with your Multics account and use MC from a
"supdup" connection from Multics.  The connection (being through
Telenet to Multics then through ARPA or Chaos net to MC) will probably
be somewhat "slow" and perhaps frustrating from the "user
input/output" point of view, but of course the Tensor package would
then work for you, and you could probably do any preparation of batch
files or whatever on Multics and only make use of an interactive port
to MC to do the actual calculation.  You would have to contact the
Information Processing Services to arrange this.  If they have any
questions about it, you can refer them to me.

Date: 27 March 1982 09:39-EST
From: Jeffrey P. Golden <JPG at MIT-MC>
To: ELLEN at MIT-MC, RP at MIT-MC

You people have any ideas for UNRUH:
   Date:  26 March 1982 17:08 est
   From:  Unruh.QuantGR at MIT-MULTICS
   To:  JPG at MIT-MC
   Yes, I am the William G Unruh who used to use MIT-MC, and I would love to
   use MC to do my calculations. My problem is that here I do not have access
   to ARPA NET and have been unable to find out how to get on to it from
   British Columbia. We are now on Datapac and I can therefore get onto
   Multics via TELENET. Its too expensive to phone MC (about $100/hr). If you
   have any sugestion as to how I could use MC I would love to hear it.

Date: 25 March 1982 19:42-EST
From: Richard Pavelle <RP at MIT-MC>
Subject: Bug in ctensr on Multics
To: Unruh.QuantGR at MIT-MULTICS
cc: RP at MIT-MC

    Date:  25 March 1982 17:21 est
    From:  Unruh.QuantGR at MIT-MULTICS

    I've run into another bug in CTENSR on Multics.I ran tsetup(), dimension 4,
    coordinates [u,v,x,y], symmetric metric, with 1,2=a , 3,3=b , 4,4=b
    and depends(a,[x,y],b,[x,y]). I had the metric listed. After the metric
    was displayed,I got the message
     "Call to an undefined function 'true' at Lisp level."
                  Unruh under QuantGR on Multics.
It seems to happen with any metric. MC is working fine if that helps.
We will try to do something but there is little support for MULTICS macsyma
as you may know.

RP@MIT-MC 03/25/82 19:39:35 Re: Bug in ctensr on Multics
To: JPG at MIT-MC
CC: RP at MIT-MC, CWH at MIT-MC
I ran some more tests and the CTENSR demos run on MULTICS though
this example of Unruh's bombs. The problem occurs when ANY metric 
is direct input (as opposed to the demos where the user does not
type them). I have no idea where the problem lies.

RP@MIT-MC 03/25/82 19:25:27 Re: Bug in ctensr on Multics
To: JPG at MIT-MC
CC: RP at MIT-MC, CWH at MIT-MC
    Date:  25 March 1982 17:21 est
    From:  Unruh.QuantGR at MIT-MULTICS

    coordinates [u,v,x,y], symmetric metric, with 1,2=a , 3,3=b , 4,4=b
    and depends(a,[x,y],b,[x,y]). I had the metric listed. After the metric
    was displayed,I got the message
     "Call to an undefined function 'true' at Lisp level."
                  Unruh under QuantGR on Multics.
I ran this on MC without difficulty but it does bomb out on MULTICS-
see RP;AA BUG.
Any suggestions? 

Date:  25 March 1982 17:21 est
From:  Unruh.QuantGR at MIT-MULTICS
Subject:  Bug in ctensr on Multics
To:  RP at MIT-MC

I've run into another bug in CTENSR on Multics.I ran tsetup(), dimension 4,
coordinates [u,v,x,y], symmetric metric, with 1,2=a , 3,3=b , 4,4=b
and depends(a,[x,y],b,[x,y]). I had the metric listed. After the metric
was displayed,I got the message
 "Call to an undefined function 'true' at Lisp level."
              Unruh under QuantGR on Multics.

Date: 10 March 1982 10:56-EST
From: V. Ellen Golden <ELLEN at MIT-MC>
To: GJC at MIT-MC
cc: BUG-MULMAX at MIT-MC

I moved TENSOR;ITENSR > over to Multics as
>udd>Mathlab>macsyma>share>itensr.lisp and when I attempt to loadfile
it it gets

"Call to an undefined function '?macsyma\-module' at Lisp level."

Any ideas what that is about?

ELLEN@MIT-MC 03/10/82 02:42:59 Re: TRANSFORM in CTENSR
I have changed TRANSFORM in TENSOR;MANUAL > to be TTRANSFORM, and
made the proper change in DESCRIBE.

Date: 11 March 1982 16:37-EST
From: Richard Pavelle <RP at MIT-MC>
Subject: change to ITENSR
To: INFO-TENSOR at MIT-MC

The RIEMANN function in ITENSR, which represents the standard Riemann 
4 index curvature tensor, has been renamed to CURVATURE to stop the 
conflict with the RIEMANN function in CTENSR. 

Date: 11 March 1982 08:25-EST
From: Richard Pavelle <RP at MIT-MC>
Subject: conflicting functions in ITENSR and CTENSR
To: JPG at MIT-MC
cc: RP at MIT-MC, ELLEN at MIT-MC

    Date: 22 September 1981 04:10-EDT
    From: Jeffrey P. Golden <JPG at MIT-MC>

       ELLEN@MIT-MC 09/22/81 03:57:36 Re: BUG - ITENSR
       I tried the ITENSO DEMO1 and it got a "too many arguments supplied
       to RIEMANN(DIS) at the first line.  You better check this, since POURNE
       may want to use these demos (and the error could be indicative of more
       serious trouble in MACSYMA).

    It appears that RIEMANN is two different functions, the one in CTENSR takes
    one arg and the one in ITENSR takes two args!  So you get into trouble 
    if you try CTENSR and ITENSR in the same MACSYMA.  What lossage!  This 
    should be fixed.
I have changed the RIEMANN function in ITENSR to CURVATURE. If this name
causes no conflicts please recompile TENSOR;ITENSR > and I will send a 
note out.

Date: 12 March 1982 09:46-EST
From: Richard Pavelle <RP at MIT-MC>
Subject: TENSOR;MANUAL >
To: ELLEN at MIT-MC
cc: RP at MIT-MC

    ELLEN@MIT-MC 03/11/82 18:19:42 Re: TENSOR;MANUAL >
    I have put CURVATURE alphabetically, which places it between COVDIFF
    and DIFF.  I myself wonder if (since there is an index) you might want
    to consider reordering the functions more by "use", if there is any
    sort of progression there... it is a very minor point, so if you don't
    care we will leave things as they are, but to me for instance it would
    seem natural to have DIFF and COVDIFF together, and have CURVATURE
    (even if it were named RIEMANN and thus came later in the alphabet) just
    before GEODESIC, since they appear (to my casual glance) to be related.
    Anyone needing the page of a precise function probably isn't going to
    be making use of the fact they are alphabetical, but rather using the
    index.
I do not think this would be useful here. Clearly, for a users manual it
is a winning idea.

ELLEN@MIT-MC 03/15/82 16:31:30
    Date: 14 March 1982 17:11-EST
    From: Richard Pavelle <RP at MIT-MC>

    I made a few more changes to the TENSOR manual. I assume you will be using
    this as the source for the new manual, right? Also, I want to remind you
    about checking that acknowledgements to not occur in the new manual.
-----------------------------------
I have removed the acknowledgement from TENSOR;MANUAL > and placed it in
DRAFT > so that if the TENSOR manual is run off again as a TM, it will appear
in that copy, but the text itself as gets slurped into the "real manual"
will not contain it.

ELLEN@MIT-MC 03/14/82 17:11:55
Yes, the PUB for the manual pulls TENSOR;MANUAL > in as source file.
I will check on the acknowledgements, thanks for reminding me.

Date: 14 March 1982 17:11-EST
From: Richard Pavelle <RP at MIT-MC>
To: ELLEN at MIT-MC
cc: RP at MIT-MC

I made a few more changes to the TENSOR manual. I assume you will be using
this as the source for the new manual, right? Also, I want to remind you
about checking that acknowledgements to not occur in the new manual.

Date: 9 March 1982 15:25-EST
From: Richard Pavelle <TENSOR at MIT-MC>
To: Kim.fateman at UCB-C70
cc: RP at MIT-MC

    Date: 4 Mar 1982 12:37:41-PST
    From: Kim.fateman at Berkeley

    I mentioned to you that "transform" as a name of a command was
    used elsewhere (than in ctensor).  It is used in "ode".  We noticed
    it on the vax because we have installed auto-load properties on
    entries into ode in our default system.
Thanks. It has been changed to TTRANSFORM in CTENSR.

Date: 9 March 1982 14:38-EST
From: Richard Pavelle <TENSOR at MIT-MC>
Subject: TRANSFORM in CTENSR
To: INFO-TENSOR at MIT-MC
cc: JPG at MIT-MC, ELLEN at MIT-MC, RJF at MIT-MC, RP at MIT-MC,
    ELL at MIT-MC

The TRANSFORM function in CTENSR has been renamed to TTRANSFORM.

RP@MIT-MC 10/04/80 16:49:41
To: JPG at MIT-MC, GJC at MIT-MC, JM at MIT-MC, RZ at MIT-MC
To: LSH at MIT-MC, TENSOR at MIT-MC
I ran some tests on GJC'c newly translated and compiled version of CTENSR 
comparing it to the FASLOAD which has been the standard. Both are about 
the same size. GJC's looks very good for the 4 tests below. LHS's version
bombed out for the 4th demo but was equivalent to GJC's wrt time
and size for the other three. In view of these results I think
this version should replace the FASSAVE. I will wait a few days
and run some more tests. Any comments?

CTENSR DEMO1 	TOTALTIME	GCTIME		FREECORE AT FINISH
FASLOAD		12402 msec.     4151 msec.      40 BLOCKS
GJC		10209 msec.	3770 msec.	41 BLOCKS

CTENSR DEMO2	TOTALTIME	GCTIME		FREECORE AT FINISH
FASLOAD		79252 msec.     23022 msec. 	32 BLOCKS
GJC		26251 msec.	9326 msec.	37 BLOCKS

CTENSR DEMO3	TOTALTIME	GCTIME		FREECORE AT FINISH
FASLOAD		54072 msec.     15815 msec.	34 BLOCKS
GJC		24662 msec.	9378 msec.	37 BLOCKS

CTENSR DEMO4	TOTALTIME	GCTIME		FREECORE AT FINISH
FASLOAD		54010 msec.     19832 msec. 	6 BLOCKS
GJC		38671 msec.	15216 msec.	9 BLOCKS

