(Trival and beginner Question) Tutorial (setf (select x 4) 11) not working

[KWC Coin]

Spending 1 whole hour on one minor issue with the tutorial and gave up on that part.

(def x (list 3 7 5 9 12 3 14 2)) ; same as (defparameter x (list 3 7 5 9 12 3 14 2)) I assume

(select x 1)                                 ; do return 7

(setf (select x 1) 11) ; Got error as below:

```

LS-USER> (setf (select x 1) 11) 

There is no applicable method for the generic function

  #<STANDARD-GENERIC-FUNCTION (COMMON-LISP:SETF SELECT:SELECT) (2)>

when called with arguments

  (11 (3 7 5 9 12 3 14 2) 1).

   [Condition of type SB-PCL::NO-APPLICABLE-METHOD-ERROR]

; Evaluation aborted on NIL

LS-USER> ; Quit to level 1

LS-USER> ; Evaluation aborted on #<SB-PCL::NO-APPLICABLE-METHOD-ERROR {10046A6203}>

```

I tried not use my slimv and do it on command line but same error message

--- compare with

(def y #(3 7 5 9 12 3 14 2))

(setf (aref y 1) 11)

y ; #(3 11 5 9 12 3 14 2)

or

(setf (nth 2 x) 11)

---

Both work.  Very rusty my lisp.  Familar more with aref in vector or car/nth in lisp for one element etc.  Select for a range or here one element I am not sure.  Somehow it cannot update in place.

As Bruce Lee would say, walk on

[Steve Nunez]

Select returns a vector, array or data-frame. It is not a setf-able place. See generalized variables and setf. This is a not-uncommon Lisp error when beginning.

 

One thing to keep in mind is that Lisp-Stat is not the same as XLISP-Stat. You won’t be able to work through that book using Lisp-Stat. Common Lisp and XLisp differ. The best tutorials are on the website https://lisp-stat.dev/. If you encounter any problems working through those tutorials, we’d like to hear about them because they all work (we think). You could work possibly work through the XLISP-Stat book using the XLS-Compat system; no one has done that though.

 

In 2022, I think your best option is to learn Common Lisp. It’s close enough to XLISP that much will be familiar, and there are many tutorials and learn resources available.  For example see:

 

• the Resources section of the website
• Learn Lisp on Reddit
• Stackoverflow, using the xlispstat tag is also monitored (I’d suggest also tagging questions with the common-lisp tag as well)
• Common Lisp on Reddit (but not too basic or people will refer you over to Learn Lisp)

 

 

 

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