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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

```