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Subject: |
calc defmath let* behaviour surprising, inconsistent, or wrong |
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Date: |
Wed, 24 Feb 2021 13:40:50 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 |
Dear maintainers
I can't seem to understand the calc documentation, or I may have found a
bug. You decide :-)
My system
"GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
of 2019-09-23, modified by Debian"
I'm trying to define a calc function f() for use in org mode. Here is a
minimal example of what I've tried. It's not the same function, but it
exhibits the same behaviour. Put this text in a buffer with org mode:
#+BEGIN_SRC emacs-lisp
(defmath f(x)
(let* ((m x)
(n (+ m 1)))
n))
#+END_SRC
#+RESULTS:
: calcFunc-f
| x | y |
|-----+--------|
| 1.0 | f(1.) |
| 1.5 | f(1.5) |
| 2.0 | f(2.) |
| 2.5 | f(2.5) |
| 3.0 | f(3.) |
| 3.5 | f(3.5) |
| 4.0 | f(4.) |
| 4.5 | f(4.5) |
| 5.0 | f(5.) |
#+TBLFM: $2=f($1)
Evaluating the source block (C-c C-c on END_SRC) defines f()
successfully. Then hitting C-c C-c on the TBLFM line shoud result in the
y column of the table to be filled with the x column, plus 1, which it
doesn't.
If I directly evaluate x + 1, it works:
#+BEGIN_SRC emacs-lisp
(defmath f(x)
(+ x 1))
#+END_SRC
#+RESULTS:
: calcFunc-f
| x | y |
|-----+-----|
| 1.0 | 2. |
| 1.5 | 2.5 |
| 2.0 | 3. |
| 2.5 | 3.5 |
| 3.0 | 4. |
| 3.5 | 4.5 |
| 4.0 | 5. |
| 4.5 | 5.5 |
| 5.0 | 6. |
#+TBLFM: $2=f($1)
It seems to me that the problem is with the let* special form, which
simply doesn't seem to work. let works:
#+BEGIN_SRC emacs-lisp
(defmath f(x)
(let ((n (+ x 2)))
n))
#+END_SRC
#+RESULTS:
: calcFunc-f
| x | y |
|-----+-----|
| 1.0 | 3. |
| 1.5 | 3.5 |
| 2.0 | 4. |
| 2.5 | 4.5 |
| 3.0 | 5. |
| 3.5 | 5.5 |
| 4.0 | 6. |
| 4.5 | 6.5 |
| 5.0 | 7. |
#+TBLFM: $2=f($1)
I couldn't find anything in the documentation that would forbid me from
using let* in the body of a defmath. I also couldn't find anything that
would explain this behaviour. Now I'm not an expert on Lisp, so it's
entirely possible that I've done something stupid, or missed something
in the documentation, but I can't find out what it might be.
Thank you very much for Emacs. After several years of using other
editors, I'm coming back to Emacs and I don't think I'll leave it again.
Well, except maybe for ed(1). Ed is the standard editor.
Cheers
Stephan
PS: I'm following the instructions in the calc manual for filing a bug.
There is no mention of a mailing list or a bug tracker for me to sign up
to, so I'd be grateful if you could answer this email, otherwise I might
miss requests for more information or the announcement of a resolution.
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--- Begin Message ---
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Subject: |
Re: bug#46750: calc defmath let* behaviour surprising, inconsistent, or wrong |
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Date: |
Fri, 5 Mar 2021 11:58:15 +0100 |
5 mars 2021 kl. 11.49 skrev Stephan Neuhaus <stephan.neuhaus@zhaw.ch>:
> I can confirm that the calc that's in the current master branch (development
> version for 28.1) fixes my problem. You hinted that there were further
> problems too, but I have only checked that let* now seems to work as
> intended. Also, to be fair, I have checked that only for my own use case.
Thanks for checking! Marking the bug as closed then.
> Now I'll have to decide whether to build emacs for Debian myself or whether
> to wait for Debian to adopt emacs >= 28.1.
Well, Emacs release cycles are not known for their brisk pacing; you would have
to wait for quite a while. (And obviously, we don't mind more people testing
the development versions!)
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