[R] Extract student ID that match certain criteria
roslinazairimah zakaria
roslinaump at gmail.com
Wed Mar 15 14:49:07 CET 2017
Hi Caitlin,
I tried so many ways as suggested but unsuccessful...and I realise that I
need to filter the student ID and their CGPA, but if I change the ID into
character I lost the CGPA value. It is easy to do in excel, however a bit
time consuming and trying to do in R.
I have these data:
dput(dt_all2)
structure(list(FAC_CODE = structure(c(2L, 2L, 2L, 4L, 1L, 1L,
4L, 7L, 3L, 3L, 3L, 3L, 3L, 2L, 2L, 1L, 2L, 5L, 6L), .Label = c("FKASA",
"FKEE", "FKKSA", "FKM", "FKP", "FSKKP", "FTK"), class = "factor"),
STUDENT_ID = structure(c(9L, 6L, 7L, 17L, 2L, 3L, 18L, 19L,
13L, 12L, 14L, 15L, 16L, 10L, 8L, 1L, 5L, 11L, 4L), .Label =
c("AA14068",
"AB15103", "AB15124", "CC14107", "EA13043", "EB14059", "EB14073",
"EB14101", "EC14021", "EC15063", "FB14085", "KA13142", "KA13143",
"KA13156", "KE13034", "KE13046", "MA14071", "MA14115", "PA13048"
), class = "factor"), PROGRAM = structure(c(2L, 1L, 1L, 2L,
1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 2L, 2L, 1L
), .Label = c("DIPLOMA", "IJAZAH SARJANA MUDA"), class = "factor"),
CGPA = c(2.42, 3.27, 1.98, 2.85, 2.24, 3.01, 3.31, 2.88,
3.61, 3.69, 3.2, 3.85, 3.63, 2.67, 2.35, 2.74, 1.96, 2.89,
2.59)), .Names = c("FAC_CODE", "STUDENT_ID", "PROGRAM", "CGPA"
), class = "data.frame", row.names = c(NA, -19L))
and I want to filter my data as follows:
> dput(dt_all3)
structure(list(FAC_CODE = structure(c(2L, 2L, 4L, 4L, 5L, 1L,
6L, 3L, 3L, 3L, 3L, 3L, 2L), .Label = c("FKASA", "FKEE", "FKKSA",
"FKM", "FKP", "FTK"), class = "factor"), STUDENT_ID = structure(c(4L,
3L, 11L, 12L, 5L, 1L, 13L, 7L, 6L, 8L, 9L, 10L, 2L), .Label = c("AA14068",
"EA13043", "EC14021", "EC15063", "FB14085", "KA13142", "KA13143",
"KA13156", "KE13034", "KE13046", "MA14071", "MA14115", "PA13048"
), class = "factor"), PROGRAM = structure(c(1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = "IJAZAH SARJANA MUDA", class =
"factor"),
CGPA = c(2.67, 2.42, 2.85, 3.31, 2.89, 2.74, 2.88, 3.61,
3.69, 3.2, 3.85, 3.63, 1.96)), .Names = c("FAC_CODE", "STUDENT_ID",
"PROGRAM", "CGPA"), class = "data.frame", row.names = c(NA, -13L
))
I would like to select the student id where the third and fourth value
represent the year they register data is eg. AA15..., AE14,... and I would
also to select their cgpa value.
Thank you.
On Mon, Mar 13, 2017 at 2:26 PM, roslinazairimah zakaria <
roslinaump at gmail.com> wrote:
> Thank you so much for your help.
>
> On Mon, Mar 13, 2017 at 1:52 PM, bioprogrammer <bioprogrammer at gmail.com>
> wrote:
>
>> Hi.
>>
>> I would use the "substr" function:
>>
>> https://stat.ethz.ch/R-manual/R-devel/library/base/html/substr.html
>>
>> ...assuming you're working with character data.
>>
>> Another useful skill involves working with regular expressions.
>>
>> http://www.endmemo.com/program/R/grep.php
>>
>> http://regular-expressions.mobi/tutorial.html
>>
>> Hope these help :)
>>
>> ~Caitlin
>>
>>
>>
>>
>>
>> Sent from my T-Mobile 4G LTE Device
>>
>>
>> -------- Original message --------
>> From: roslinazairimah zakaria <roslinaump at gmail.com>
>> Date:03/12/2017 10:18 PM (GMT-07:00)
>> To: Bert Gunter <bgunter.4567 at gmail.com>
>> Cc: r-help mailing list <r-help at r-project.org>
>> Subject: Re: [R] Extract student ID that match certain criteria
>>
>> Another question,
>>
>> How do I extract ID based on the third and fourth letter:
>>
>> I have for example, AA14004, AB15035, CB14024, PA14009, PA14009 etc
>>
>> I would like to extract ID no. of AB14..., CB14..., PA14...
>>
>> On Mon, Mar 13, 2017 at 12:37 PM, roslinazairimah zakaria <
>> roslinaump at gmail.com> wrote:
>>
>> > Hi Bert,
>> >
>> > Thank you so much for your help. However I don't really sure what is
>> the
>> > use of y values. Can we do without it?
>> >
>> > x <- as.character(FKASA$STUDENT_ID)
>> > y <- c(1,786)
>> > My.Data <- data.frame (x,y)
>> >
>> > My.Data[grep("^AA14", My.Data$x), ]
>> >
>> > I got the following data:
>> >
>> > x y
>> > 1 AA14068 1
>> > 7 AA14090 1
>> > 11 AA14099 1
>> > 14 AA14012 786
>> > 15 AA14039 1
>> > 22 AA14251 786
>> >
>> > On Mon, Mar 13, 2017 at 11:51 AM, Bert Gunter <bgunter.4567 at gmail.com>
>> > wrote:
>> >
>> >> 1. Your code is incorrect. All entries are character strings and must
>> be
>> >> quoted.
>> >>
>> >> 2. See ?grep and note in particular (in the "Value" section):
>> >>
>> >> "grep(value = TRUE) returns a character vector containing the selected
>> >> elements of x (after coercion, preserving names but no other
>> >> attributes)."
>> >>
>> >>
>> >> 3. While the fixed = TRUE option will work here, you may wish to learn
>> >> about "regular expressions", which can come in very handy for
>> >> character string manipulation tasks. ?regex in R has a terse, but I
>> >> have found comprehensible, discussion. There are many good gentler
>> >> tutorials on the web, also.
>> >>
>> >>
>> >> Cheers,
>> >> Bert
>> >>
>> >> Bert Gunter
>> >>
>> >> "The trouble with having an open mind is that people keep coming along
>> >> and sticking things into it."
>> >> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>> >>
>> >>
>> >> On Sun, Mar 12, 2017 at 8:32 PM, roslinazairimah zakaria
>> >> <roslinaump at gmail.com> wrote:
>> >> > Dear r-users,
>> >> >
>> >> > I have this list of student ID,
>> >> >
>> >> > dt <- c(AA14068, AA13194, AE11054, AA12251, AA13228, AA13286,
>> AA14090,
>> >> > AA13256, AA13260, AA13291, AA14099, AA15071, AA13143, AA14012,
>> AA14039,
>> >> > AA15018, AA13234, AA13149, AA13282, AA13218)
>> >> >
>> >> > and I would like to extract all student of ID AA14... only.
>> >> >
>> >> > I search and tried substrt, subset and select but it fail.
>> >> >
>> >> > substr(FKASA$STUDENT_ID, 2, nchar(string1))
>> >> > Error in nchar(string1) : 'nchar()' requires a character vector
>> >> >> subset(FKASA, STUDENT_ID=="AA14" )
>> >> > [1] FAC_CODE FACULTY STUDENT_ID NAME PROGRAM
>> KURSUS
>> >> > CGPA ACT_SS ACT_VAL ACT_CS ACT_LED ACT_PS
>> >> > ACT_IM
>> >> > [14] ACT_ENT ACT_CRE ACT_UNI ACT_VOL...
>> >> >
>> >> > Thank you so much for your help.
>> >> >
>> >> > How do I do it?
>> >> > --
>> >> > *Roslinazairimah Zakaria*
>> >> > *Tel: +609-5492370 <+60%209-549%202370>; Fax. No.+609-5492766
>> <+60%209-549%202766>*
>> >> >
>> >> > *Email: roslinazairimah at ump.edu.my <roslinazairimah at ump.edu.my>;
>> >> > roslinaump at gmail.com <roslinaump at gmail.com>*
>> >> > Faculty of Industrial Sciences & Technology
>> >> > University Malaysia Pahang
>> >> > Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia
>> >> >
>> >> > [[alternative HTML version deleted]]
>> >> >
>> >> > ______________________________________________
>> >> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> >> > https://stat.ethz.ch/mailman/listinfo/r-help
>> >> > PLEASE do read the posting guide http://www.R-project.org/posti
>> >> ng-guide.html
>> >> > and provide commented, minimal, self-contained, reproducible code.
>> >>
>> >
>> >
>> >
>> > --
>> > *Roslinazairimah Zakaria*
>> > *Tel: +609-5492370 <+60%209-549%202370> <+60%209-549%202370>; Fax. No.
>> +609-5492766 <+60%209-549%202766>
>> > <+60%209-549%202766>*
>> >
>> > *Email: roslinazairimah at ump.edu.my <roslinazairimah at ump.edu.my>;
>> > roslinaump at gmail.com <roslinaump at gmail.com>*
>> > Faculty of Industrial Sciences & Technology
>> > University Malaysia Pahang
>> > Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia
>> >
>>
>>
>>
>> --
>> *Roslinazairimah Zakaria*
>> *Tel: +609-5492370 <+60%209-549%202370>; Fax. No.+609-5492766
>> <+60%209-549%202766>*
>>
>> *Email: roslinazairimah at ump.edu.my <roslinazairimah at ump.edu.my>;
>> roslinaump at gmail.com <roslinaump at gmail.com>*
>> Faculty of Industrial Sciences & Technology
>> University Malaysia Pahang
>> Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posti
>> ng-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
> *Roslinazairimah Zakaria*
> *Tel: +609-5492370 <+60%209-549%202370>; Fax. No.+609-5492766
> <+60%209-549%202766>*
>
> *Email: roslinazairimah at ump.edu.my <roslinazairimah at ump.edu.my>;
> roslinaump at gmail.com <roslinaump at gmail.com>*
> Faculty of Industrial Sciences & Technology
> University Malaysia Pahang
> Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia
>
--
*Roslinazairimah Zakaria*
*Tel: +609-5492370; Fax. No.+609-5492766*
*Email: roslinazairimah at ump.edu.my <roslinazairimah at ump.edu.my>;
roslinaump at gmail.com <roslinaump at gmail.com>*
Faculty of Industrial Sciences & Technology
University Malaysia Pahang
Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia
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