EViews.com

Whether the Eviews is case-sensitive in strings?
i.e. here:
Cases 1) works, but case 2) doesn't.

1) %name_root = @left(%name_var, @instr(%name_var, "_mm"))
or
2) %name_root = @left(%name_var, @instr(%name_var, "_MM"))

Yes, it is.

aha. ok.
But then, sometimes it is vice versa. Case 2) works, but Case 1) doesn't. I have few subroutines with "_MM" uppercases. I wonder how it might be?! when all the elements in workfile have lowercases... What it depends on?

1) %name_root = @left(%name_var, @instr(%name_var, "_mm"))
2) %name_root = @left(%name_var, @instr(%name_var, "_MM"))

Regards
Andrei

I don't understand your question. The @instr function is case-sensitive.

Ok. let put it in an example. My confusion is the following. In the code below, I generate series ser1_mm and ser2_mm, having in mind they are lowercases. Then to subtract suffix "_mm" (lowercase) I exploit @instr with uppercase "_MM". Why "_MM" in uppercases? Note, "_mm" (lowercase) doesn't work for me later to obtain ser1_yy and ser2_yy. What forces Eviews to understand "_MM", but not "_mm"?
Regards
Andrei

Objects in a workfile are case insensitive. There is no difference between the series "AAA" and the series "aaa". They are the same series. You can create a series called "AAA" and it will be shown as "aaa" in the workfile. You can refer to that series as "aaa" or "AAA" and EViews will know what you mean.

Functions that work with strings are, in general, case-sensitive.

Functions that return information about objects as a string are, in general, returned in upper-case.

ok. thanks. Now I understood what the problem is. I have another example below, where I treated series name as string without refering to object, that's why in this case "_mm" (lowercases) was the solution, but not "_MM". This raised my confusion.
In turn, in previous example I treated series names as strings refering to group objects.
But then do we have any function that extracts string referring to series name? something similar to what we have for group elements:

(from the code before)
group _gr_ser ser1_mm ser2_mm
%name_endog = _gr_ser.@seriesname(!C)

potentially might be something like this to extract series name as string:
%name_endog = ser1_mm.@seriesname

All objects have a .@name data member.

Thanks.

Andrei