Compare value with list

[carlos_m_gil_p]

Hello boys how are you.

I wanted to ask you, how can I compare a numerical value with a list and know if they are the same or not.

I have two variables.

(setq val 0.0)

(setq lst '(-0.23297 -0.23297 1.0 0.05 4))

val contains the value to compare. This value can be any.

lst contains a list of values, this list can have one or more values.

I need it to return T if all the values of the variable lst are equal to the value of the variable val.

Beforehand thank you very much.

[ВeekeeCZ · Accepted solution]

Try 

(apply '= (cons val lst))

[carlos_m_gil_p]

Hello brother, thanks for your help, it worked very well.

Greetings.

[john.uhden · Accepted solution]

I wrote this earlier today, but something snapped... gone.

Real numbers are not as exact as one might think.

If you are looking for matches that are close enough then

(setq fuzz 0.00001) ;; or whatever you like, then

(vl-every '(lambda (x)(equal val x fuzz)) lst)

[carlos_m_gil_p]

Hello Brother how are you.
I tried your option and it works very well for me.
I think the more exact the better.
I don't know which is better.

[ronjonp]

IMO, use your acceptable tolerance when comparing real numbers.

[carlos_m_gil_p]

Hello guys, thanks for all the opinions and help, I will take them into account.
Greetings.