Hello,
I have tried this function in order to be able to add together all the elements of a list (or vector) of variable length, including having one single element, but I don't know how to make it work.

suml(a):=if IsDefined(length(a))
sum(a)
else
a

It says "syntax is incorrect"...

Any suggestion?

If the boolean testing is "false" then is the "true" option evaluated or not? (I guess it shouldn't...)

Thanks in advance
Laurent

Hello I found a solution:

suml(a):=line(
a:=stack(a,0)
sum(a)
)

Sorry to have bothered this forum with such a basic question !

Wrote

Hello,
I have tried this function in order to be able to add together all the elements of a list (or vector) of variable length, including having one single element, but I don't know how to make it work.

suml(a):=if IsDefined(length(a))
sum(a)
else
a

It says "syntax is incorrect"...

Any suggestion?

If the boolean testing is "false" then is the "true" option evaluated or not? (I guess it shouldn't...)

Thanks in advance
Laurent

Wrote

Great !
I learned something new!
Thanks a lot.

You're welcome

Note that using the stack approach you don't need the zero

Wrote

You're welcome

Note that using the stack approach you don't need the zero

Ha! :d :d That's puzzling! You can "stack" nothing on something!

Anyway, around this remarquable Smath Studio software is a no less remarquable community!