\name{OpenLargefiles}
\alias{OpenLargefiles}
\title{This function loads large data set made from tab delimited files}
\description{
 The function creates and expressionSet starting from al file containing the expresison data in a tab delimited format.
 This file is loaded together with the description of the clinical paramenters present in Target 
 This function uses a specific configuration of Target column of the affylmGUI target file.
 To know more about target file see affylmGUI help.
 Each row of the column named Target, in the affylmGUI target file, describes the clinical parameters.
 Each clinical parameter is separated from the others by an underscore. 
 the affylmGUI target file will look like:
 Name	FileName	Target
 mC1	M1.CEL	\verb+pos_yes_1_NA_0+
 mC2	M4.CEL	\verb+pos_no_2_NA_0+
 mC3	M7.CEL	\verb+neg_no_3_pos_0+
 mE1	M3.CEL	\verb+neg_yes_3_neg_0+
 mE2	M6.CEL	\verb+neg_no_NA_1_0+
 mE3	M9.CEL	\verb+neg_yes_3_pos_0+
 mI1	M2.CEL	\verb+pos_no_2_neg_1+
 mI2	M5.CEL	\verb+pos_yes_2_pos_1+
 mI3	M8.CEL	\verb+pos_no_2_pos_1+
}
\usage{OpenLargefiles()}
\author{Raffaele A Calogero}
\keyword{utilities}