Sri krishna Devarayalu Balanagu
2012-Aug-14 12:40 UTC
[R] Not able to filter factor, class
After importing data from Excel through ODBC.
In the inclusion dataset, class(inclusion$Value) is coming as factor. After
filtering the data, length(inclusion$Value == 0),the answer is coming as 4879,
but actually Value contains only 225 rows. So how can I get the length as 225.
Can anyone help?
setwd("D:/AZ")
library("RODBC")
cdb_cnct <-
odbcConnectExcel("AZIF_DC_GVK_NSCLC_MSALL_287papers_02072012_141450_v1_4.xls")
arm <- sqlFetch(cdb_cnct, "Arm")
inclusion <- sqlFetch(cdb_cnct, "Inclusion")
odbcClose(cdb_cnct)
rm(cdb_cnct)
names(inclusion)
[1] "Trial_Design_ID" "Reference_ID"
"Inclusion_Criteria"
[4] "Value" "F5"
"F6"> class(inclusion$Value)
[1] "factor"
> nrow(inclusion)
[1] 4879> length(inclusion$Value == 0)
[1] 4879> length(inclusion$Value == "0")
[1] 4879
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Are you sure that you are not confusing the number of levels with the length of the vector? John Kane Kingston ON Canada> -----Original Message----- > From: balanagudevarayulu at gvkbio.com > Sent: Tue, 14 Aug 2012 12:40:26 +0000 > To: r-help at r-project.org > Subject: [R] Not able to filter factor, class > > After importing data from Excel through ODBC. > In the inclusion dataset, class(inclusion$Value) is coming as factor. > After filtering the data, length(inclusion$Value == 0),the answer is > coming as 4879, but actually Value contains only 225 rows. So how can I > get the length as 225. > Can anyone help? > > setwd("D:/AZ") > library("RODBC") > cdb_cnct <- > odbcConnectExcel("AZIF_DC_GVK_NSCLC_MSALL_287papers_02072012_141450_v1_4.xls") > arm <- sqlFetch(cdb_cnct, "Arm") > inclusion <- sqlFetch(cdb_cnct, "Inclusion") > odbcClose(cdb_cnct) > rm(cdb_cnct) > names(inclusion) > [1] "Trial_Design_ID" "Reference_ID" "Inclusion_Criteria" > [4] "Value" "F5" "F6" >> class(inclusion$Value) > [1] "factor" > >> nrow(inclusion) > [1] 4879 >> length(inclusion$Value == 0) > [1] 4879 >> length(inclusion$Value == "0") > [1] 4879 > ________________________________ > Notice: The information contained in this electronic mail message is > intended only for the use of the designated recipient. This message is > privileged and confidential. and the property of GVK BIO or its > affiliates and subsidiaries. If the reader of this message is not the > intended recipient or an agent responsible for delivering it to the > intended recipient, you are hereby notified that you have received this > message in error and that any review, dissemination, distribution, or > copying of this message is strictly prohibited. If you have received this > communication in error, please notify us immediately by telephone > +91-40-66929999<tel:%2B91-40-66929999> and destroy any and all copies of > this message in your possession (whether hard copies or electronically > stored copies). > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.____________________________________________________________ FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop!
Hi> > After importing data from Excel through ODBC. > In the inclusion dataset, class(inclusion$Value) is coming as factor. > After filtering the data, length(inclusion$Value == 0),the answer is > coming as 4879, but actually Value contains only 225 rows. So how can IHow do you know? What does str(inclusion) and dim(inclusion) says about your data.> get the length as 225. > Can anyone help? > > setwd("D:/AZ") > library("RODBC") > cdb_cnct <- > odbcConnectExcel("AZIF_DC_GVK_NSCLC_MSALL_287papers_02072012_141450_v1_ > 4.xls") > arm <- sqlFetch(cdb_cnct, "Arm") > inclusion <- sqlFetch(cdb_cnct, "Inclusion") > odbcClose(cdb_cnct) > rm(cdb_cnct) > names(inclusion) > [1] "Trial_Design_ID" "Reference_ID" "Inclusion_Criteria" > [4] "Value" "F5" "F6" > > class(inclusion$Value) > [1] "factor" > > > nrow(inclusion) > [1] 4879 > > length(inclusion$Value == 0) > [1] 4879 > > length(inclusion$Value == "0") > [1] 4879Any from the above gives you logical vector with same length as inclusion$Value. If you want only TRUE values use ?subset or ?"[" to select those values. Regards Petr> ________________________________ > Notice: The information contained in this electronic mail message is > intended only for the use of the designated recipient. This message is > privileged and confidential. and the property of GVK BIO or its > affiliates and subsidiaries. If the reader of this message is not the > intended recipient or an agent responsible for delivering it to the > intended recipient, you are hereby notified that you have received this > message in error and that any review, dissemination, distribution, or > copying of this message is strictly prohibited. If you have received > this communication in error, please notify us immediately by telephone > +91-40-66929999<tel:%2B91-40-66929999> and destroy any and all copies > of this message in your possession (whether hard copies or > electronically stored copies). > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code.