[R] merge multiple .csv files

[Bill.Venables at csiro.au]

You want advice?

1. Write sentences that contain a subject and where appropriate, an object as well.  This makes your email just that bit more polite.  This list is not a paid service.

2. The "sheets" may have variables in common, but do they have the same name in both, and the same class, and some values in common?  

You do not give us very much to go on.   

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Benjamin Caldwell
Sent: Thursday, 10 February 2011 1:22 PM
To: r-help
Subject: [R] merge multiple .csv files

Am trying to merge about 15 .csv tables - tried a test run but came up with
0 rows (no data for each variable/column head)

> CAHSEE.EA.feb.2009<-read.csv("2009 CAHSEE EA feb 2009.csv", header=TRUE)
> CAHSEE.IM.MATH.2009<-read.csv("2009 CAHSEE Impact Math.csv", header=TRUE)
> testmerge<-merge(CAHSEE.EA.feb.2009,CAHSEE.IM.MATH.2009)
> testmerge
 [1] Grade          LocalStudentID MathPassed     MathScaleScore SchoolCode

 [6] LastName       FirstName      ELAPassed      ELAScaleScore
 MathTestDate
<0 rows> (or 0-length row.names)

I know several variables are shared in both sheets. Please advise.

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