Hello,
1) The best I could find on lower case/upper case is [1];
The Wikipedia page you link to is about a code page and the collating
sequence is the same as ASCII so no, that's not it.
2) In the cp1252 table "A" < "a", it follows the numeric order 0x31 <
0x41. But what R is using is the locale LC_COLLATE setting, not the "C"
one.
How to validate the end results? The best way is to check the current
setting, with Sys.getlocale.
[1]
https://books.google.pt/books?id=GkajBQAAQBAJ&pg=PA259&lpg=PA259&dq=collating+sequence+portuguese&source=bl&ots=fVnUYHz0ev&sig=ACfU3U3xjpJfPNcWEfvwb_2nScYb89CeOw&hl=pt-PT&sa=X&ved=2ahUKEwiAoNTW-JP3AhVI1xoKHXT-C4oQ6AF6BAgUEAM#v=onepage&q=collating%20sequence%20portuguese&f=false
Hope this helps,
Rui Barradas
Às 16:33 de 14/04/2022, Kristjan Kure escreveu:
Hi Rui
Thank you for the code snippet.
1) How do you find your "Portuguese_Portugal.1252" symbols table now?
Is it this https://en.wikipedia.org/wiki/Windows-1252
<https://en.wikipedia.org/wiki/Windows-1252>?
2) What attributes and values do you check to validate the end result?
I see there is a section "Codepage layout" and I can find "A" and "a"
symbols.
What values on that table tell you "A" is bigger than "a"?
"A" < "a" # returns FALSE
"A" > "a" # returns TRUE
PS! My locale is Estonian_Estonia.1257
Regards,
Kristjan
On Thu, Apr 14, 2022 at 5:05 PM Rui Barradas <ruipbarra...@sapo.pt
<mailto:ruipbarra...@sapo.pt>> wrote:
Hello,
This is a locale issue, you are counting on the ASCII table codes but
that's only valid for the "C" locale.
old_loc <- Sys.getlocale("LC_COLLATE")
"A" < "a"
#> [1] FALSE
"A" > "a"
#> [1] TRUE
Sys.setlocale("LC_COLLATE", locale = "C")
#> [1] "C"
"A" < "a"
#> [1] TRUE
"A" > "a"
#> [1] FALSE
Sys.setlocale("LC_COLLATE", old_loc)
#> [1] "Portuguese_Portugal.1252"
Hope this helps,
Rui Barradas
Às 15:06 de 13/04/2022, Kristjan Kure escreveu:
> Hi!
>
> Sorry, I am a beginner in R.
>
> I was not able to find answers to my questions (tried Google, Stack
> Overflow, etc). Please correct me if anything is wrong here.
>
> When comparing symbols/strings in R - raw numeric values are compared
> symbol by symbol starting from left? If raw numeric values are
not used is
> there an ASCII / Unicode table where symbols have
values/ranking/order and
> R compares those values?
>
> *2) Comparing symbols*
> Letter "a" raw value is 61, letter "b" raw value is 62? Is this
correct?
>
> # Raw value for "a" = 61
> a_raw <- charToRaw("a")
> a_raw
>
> # Raw value for "b" = 62
> b_raw <- charToRaw("b")
> b_raw
>
> # equals TRUE
> "a" < "b"
>
> Ok, so 61 is less than 62 so it's TRUE. Is this correct?
>
> *3) Comparing strings #1*
> "1040" <= "12000"
>
> raw_1040 <- charToRaw("1040")
> raw_1040
> #31 *30* (comparison happens with the second symbol) 34 30
>
> raw_12000 <- charToRaw("12000")
> raw_12000
> #31 *32* (comparison happens with the second symbol) 30 30 30
>
> The symbol in the second position is 30 and it's less than 32.
Equals to
> true. Is this correct?
>
> *4) Comparing strings #2*
> "1040" <= "10000"
>
> raw_1040 <- charToRaw("1040")
> raw_1040
> #31 30 *34* (comparison happens with third symbol) 30
>
> raw_10000 <- charToRaw("10000")
> raw_10000
> #31 30 *30* (comparison happens with third symbol) 30 30
>
> The symbol in the third position is 34 is greater than 30. Equals
to false.
> Is this correct?
>
> *5) Problem - Why does this equal FALSE?*
> *"A" < "a"*
>
> 41 < 61 # FALSE?
>
> # Raw value for "A" = 41
> A_raw <- charToRaw("A")
> A_raw
>
> # Raw value for "a" = 61
> a_raw <- charToRaw("a")
> a_raw
>
> Why is capitalized "A" not less than lowercase "a"? Based on raw
values it
> should be. What am I missing here?
>
> Thanks
> Kristjan
>
> [[alternative HTML version deleted]]
>
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