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Truncate a List

leto over 4 years ago

Hello All,

I have a list with a certain length.

I need to truncate it to make is a shorter list.

Is there a function that can do this most efficiently?

If not, any suggestion on the most efficient way to do this?

Thanks All.

DavidJHutchins over 4 years ago

One possible solution would be to use the undocumented 'unique' function...

testdata = list( "a" "z" "q" "w" "s" "x" "a")

("a" "z" "q" "w" "s"

"x" "a"

)

unique(testdata)

Loading skillExt.cxt

("a" "z" "q" "w" "s"

"x"

)
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leto over 4 years ago in reply to DavidJHutchins

Thank you David. What i meant was if I had a list that was 5 elements and I want to create a copy of the same list but only up to 3 elements. Could it be done with a function?
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DavidJHutchins over 4 years ago

try calling cdr() twice to remove the first 2 entries

D:\Temp>il_allegro
> testdata = list( "a" "z" "q" "w" "s")
("a" "z" "q" "w" "s")
> length(testdata)
5
> newdata=cdr(cdr(testdata))
("q" "w" "s")
> length(newdata)
3
> exit

D:\Temp>
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eDave over 4 years ago

nthcdr does this.

eg. nthcdr(2 '(1 2 3 4)) -> (3 4)

reverse(nthcdr(2 reverse('(1 2 3 4 5)))) -> (1 2 3)
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