EViews.com

Posted: **Mon May 04, 2015 10:24 am**

Hi there,

Just wondering what would be the easiest way to implement something akin to a switch-case statement in EViews. Is there some sort of dictionary or map function, or are nested if-statements the best option as in the code below?

Thanks in advance,

Michael

for %ind CN RL AU
if %ind="CN" then
%naics = "23"
else
if %ind="RL" then
%naics = "53"
else
if %ind="AU" then
%naics = "71"
endif
endif
endif
...
...
next

Posted: **Mon May 04, 2015 10:27 am**

Nested ifs :(

Posted: **Mon May 04, 2015 10:31 am**

:( indeed. It could get pretty ugly.

Thanks anyway.

Posted: **Mon May 04, 2015 11:28 am**

You can fake a dictionary using something like

Code: Select all

%list1 = "cn rl au gb fc"
svector a = @wsplit(%list1)

%list2 = "23 53 71 53 94"
svector b = @wsplit(%list2)

for %z cn rl au

for !i=1 to @rows(a)
   if (%z = a(!i)) then 
       %naics = b(!i)
       %temp = %z + ":  " + %naics
       statusline %temp
       break
   endif
next

next

Here I'm using %temp to show the paired strings at the bottom of the screen.

If you need to do this a lot, I'd make a subroutine for the inner matching loop and pass in the comparison and lookup vectors. Then you'd have something like

Code: Select all

%list1 = "cn rl au gb fc"
svector a = @wsplit(%list1)

%list2 = "23 53 71 53 94"
svector b = @wsplit(%list2)

for %z cn rl au
call lookup(%naics, a, b)
next

where the subroutine lookup is defined appropriately.

Posted: **Mon May 04, 2015 12:30 pm**

Thanks for that Glenn. This should do the trick, and the subroutine makes it far cleaner.

Cheers,

Michael

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