Re: [ferret_users] existence of elements in array

[Akshay Hegde <akshay.k.hegde@xxxxxxxxx>]

Hi Marco!

Make use of "IS_ELEMENT_OF" function

[root@localhost tmp]# f
     NOAA/PMEL TMAP
     FERRET v6.96 
     Linux 2.6.32-573.7.1.el6.x86_64 64-bit - 12/02/15
     16-Jun-17 17:42    

yes? let aa = {1, 2, 3};
yes? list IS_ELEMENT_OF(aa, 3)
             VARIABLE : IS_ELEMENT_OF(AA, 3)
             X        : 1
          1.000
yes? list IS_ELEMENT_OF(aa, 35)
             VARIABLE : IS_ELEMENT_OF(AA, 35)
             X        : 1
          0.0000
yes? IF `IS_ELEMENT_OF(aa, 35) NE 0` THEN
 !-> IF 0 THEN
yes? say 'exists'
yes? ELSE
yes? say 'does not exists'
'does not exists'
yes? ENDIF
yes?

Regards,

Akshay Hegde,

Data and Information,

CSIR-NIO
https://about.me/akshay.k.hegde

On Fri, Jun 16, 2017 at 5:01 PM, Marco van Hulten <Marco.Hulten@xxxxxx> wrote:

Hello,

I would like to see if certain elements are in an array.  Suppose I
have and array  aa = {1, 2, 3} ,  I want to check if a number is in the
array (pseudo-ferret code):

    if `3 \in aa` then say "3 is in aa"
    if `7 \in aa` then say "7 is in aa"

How would you write out the \in in Ferret?

Or, using fewer characters, a case statement like (pseudo-bash code):

    case bb in
        3) say "3 is in aa"
        7) say "7 is in aa"

Is there any equivalent in classical Ferret?

In the end I want to do this with an array of strings.

 - Marco