Re: [MIT-Scheme-users] ref error

[David Gray]

This could have been the case as I was messing around in the repl. However when 
I tried to find the simplest case to replicate
the error I restarted scheme, did a load, then got the error. Then I restarted 
again, pasted the code from the file to *scheme*
where everything was OK. Another thing that was strange was that I could do 
(ref ‘(1 2 3 4 5) 2) in *scheme* after the error, as it
was only the loaded function that gave the error.   

> On 2 Nov 2017, at 00:11, Matt Birkholz  wrote:
> 
> On Wed, 2017-11-01 at 23:59 +0200, David Gray wrote:
>> This is the scmutils generic ref. When I replace the generic ref with
>> vector-ref it works ok, I just thought this error was strange, the
>> only difference being loading the file or just using it from the
>> repl.
> 
> There is this "gotcha" with the *scheme* buffer:
> 
>After examining an error, whether or not you choose to enter the
>debugger, you should type "C-c C-c" to get back to the top level.
>This is important because if you don't the evaluations you
>subsequently perform may refer to the error state rather than to the
>state you intended.  [scmutils/manual/beginner.txt]
> 
> It sounds like the wrong environment was used somewhere.


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Re: [MIT-Scheme-users] ref error

[Matt Birkholz]

On Wed, 2017-11-01 at 23:59 +0200, David Gray wrote:
> This is the scmutils generic ref. When I replace the generic ref with
> vector-ref it works ok, I just thought this error was strange, the
> only difference being loading the file or just using it from the
> repl.

There is this "gotcha" with the *scheme* buffer:

After examining an error, whether or not you choose to enter the
debugger, you should type "C-c C-c" to get back to the top level.
This is important because if you don't the evaluations you
subsequently perform may refer to the error state rather than to the
state you intended.  [scmutils/manual/beginner.txt]

It sounds like the wrong environment was used somewhere.


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Re: [MIT-Scheme-users] ref error

[Chris Hanson]

What's ref? Do you mean vector-ref?

On Nov 1, 2017 6:48 AM, "David Gray"  wrote:

> I’m using ScmUtils 2016 compiled to a band using version 9.2 on OSX, and
> I’m running into a strange error.
> The simplest case I can boil it down to is:
> Using *scheme* I can do
> (define (g2d x y v)
>   (* (ref v 0) (exp (- (+ (/ (square (- x (ref v 1))) (* 2 (square (ref v
> 3)) )) (/ (square (- y (ref v 2))) (* 2 (square (ref v 4)
> And then:
>  (g2d 1 2 ‘(1 2 3 4 5))
> #| .9500411305585278 |#
>
> However if I save this as a file eg ref-error.scm and then load the file
> from *scheme* I get:
> ;Unbound variable: ref
>
>  Any ideas?
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