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Re: [calc] what happened to a i ???


From: boffi
Subject: Re: [calc] what happened to a i ???
Date: Tue, 14 Mar 2017 09:29:24 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

boffi <address@hidden> writes:

> Do I have to set some variable to get back the old behavior of calc?

I have found that calc has a *Trace* buffer mechanism...

old XEmacs, old calc

 |  1  Integrating sin(X) sin(2 X)...
 |  1  Found 2:3 sin(X)^3 => 2:3 sin(X)^3
 |  1  Integral of sin(X) sin(2 X)  is  2:3 sin(X)^3
 | 
 | 
 | Begin rewriting
 |                                  2:3 sin(X)^3
 | 
 | (Phase 1)
 | 
 | Done rewriting:
 |                                  2:3 sin(X)^3

Emacs 25, its calc

 |  1  Integrating sin(X) sin(2 X)...
 |  1  Found cancelled => cancelled
 |  1  Simplifying... no change
 |   1 Integrating by substitution, u = 2 X
 |   2 Integrating sin(X / 2) sin(X) / 2...
 |   2 Found cancelled => cancelled
 |   2 Simplifying... simplified
 |   3 Integrating sin(X) sin(X / 2) / 2...
 |   3 Found cancelled => cancelled
 |   4 Integrating sin(X) sin(X / 2)...
 |   4 Found cancelled => cancelled
 |   4 Integral of sin(X) sin(X / 2)  is  nil
 |   3 Integral of sin(X) sin(X / 2) / 2  is  nil
 |   2 Integral of sin(X / 2) sin(X) / 2  is  nil
 |   2 Integrating 1:2 sin(X / 2) sin(X)...
 |   2 Found cancelled => cancelled
 |   2 Simplifying... simplified
 |   3 Integrating sin(X) sin(X / 2) / 2...
 |   3 Found cancelled => cancelled
 |   4 Integrating sin(X) sin(X / 2)...
 |   4 Found cancelled => cancelled
 |   4 Integral of sin(X) sin(X / 2)  is  nil
 |   3 Integral of sin(X) sin(X / 2) / 2  is  nil
 |   2 Integral of 1:2 sin(X / 2) sin(X)  is  nil
 |   1 Integrating by substitution, u = sin(X)

it seems that the old calc has more canned results under its belt,
but of course I may be wrong...

yours
                                                      g




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