Lisp: Extract highest/lowest v

ajs · 发表于 2022-7-6 15:08:27

O.K, If I have a list, is there a function that will allow me to extract the highest value and/or lowest value?

I don't care about duplicates.

In thinking about this, I could probably accomplish this task by using nth values and performing comparisons but that seems tedious. I was hoping I could do it in a single shot with a function.

Sample:

(setq MyList ((2.00000 26.0000 26.0000 25.6250 25.6250 3.00000 3.00000 2.00000))

This is what I'm after:

(setq LowVal (MyList))

(setq HighVal(MyList))

Thanks again for any help

---AJS

CarlB · 发表于 2022-7-6 15:15:32

ajs,

From your questions, you really need to get a reference with all the lisp functions to scan through, even search.

See 'max & 'min functions....

ajs · 发表于 2022-7-6 15:21:41

Thanks for the reply. I think you're right about the search function. I do have a function list but sometimes after reading it over and over, I find that I will (through carelessness) skip over something.

An example would be my earlier question on length, for some reason, I thought that the length function applied to strings and thus I didn't examine it properly.

I'm going to go online and see if I can find a searchable lisp function list.

I do appreciate the help of course. Thank you

---AJS

CarlB · 发表于 2022-7-6 15:24:47

You're welcome.

A summary of fiuctions, alphabetical & by category is at http://ronleigh.info/autolisp/acatalog.htm

The reference "alispref.pdf" is quite handy, I'd upload it except it's much larger than allowed at this site, maybe you can find it elsewhere...

ASMI · 发表于 2022-7-6 15:28:11

copy

Command: (apply 'min '(4 6 1 8 0.5 12))0.5Command: (apply 'max '(4 6 1 8 0.5 12))12.0

Andreneves · 发表于 2022-7-6 15:31:46

The function MAX doesn´t seem to work with a already defined list of reals, eg:

Command: !(Setq A '(1.0 1.2 2.1 3.4))
(1.0 1.2 2.1 3.4))

Command: !(Max A)
; error: bad argument type: numberp: (1.0 1.2 2.1 3.4)

Command: !(Apply 'Max A)
; error: bad argument type: numberp: (1.0 1.2 2.1 3.4)

Any sugestion??

lpseifert · 发表于 2022-7-6 15:37:08

Worked for me

jammie · 发表于 2022-7-6 15:43:43

Hey ajs

There is no need to use the ! if you are defining a function on the command line

Just use as lpseifert has shown

uddfl · 发表于 2022-7-6 15:47:46

I don't mean to hijack this thread, but (somewhat related) how would I obtain values that are repeated in a list?

e.g. (setq list1 (a b b c)) - how do you extract the value of b?

Andreneves · 发表于 2022-7-6 15:52:46

Thanks, for help.

The function work fine. I had a problem, because my list has a 'nil' element.

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