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Not able to filter factor, class
4 messages · Sri krishna Devarayalu Balanagu, John Kane, nalluri pratap +1 more
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$Value == "0")
[1] 4879
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1 day later
Hi
After importing data from Excel through ODBC. In the inclusion dataset, class(inclusion$Value) is coming as factor. After filtering the data, length(inclusion$Value == 0),the answer is coming as 4879, but actually Value contains only 225 rows. So how can I
How do you know? What does str(inclusion) and dim(inclusion) says about your data.
get the length as 225.
Can anyone help?
setwd("D:/AZ")
library("RODBC")
cdb_cnct <-
odbcConnectExcel("AZIF_DC_GVK_NSCLC_MSALL_287papers_02072012_141450_v1_
4.xls")
arm <- sqlFetch(cdb_cnct, "Arm")
inclusion <- sqlFetch(cdb_cnct, "Inclusion")
odbcClose(cdb_cnct)
rm(cdb_cnct)
names(inclusion)
[1] "Trial_Design_ID" "Reference_ID" "Inclusion_Criteria"
[4] "Value" "F5" "F6"
class(inclusion$Value)
[1] "factor"
nrow(inclusion)
[1] 4879
length(inclusion$Value == 0)
[1] 4879
length(inclusion$Value == "0")
[1] 4879
Any 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.