Input box for a triple inputs
character vector with the text label of the box
character vector with the initialization
See example for the element order in the vectors :
To get the menu, just use the following code:
vlabel<-c('matrix 1','matrix 2','matrix 3')
List with the user answers as characters
Lawrence M.F.,Verzani J., (2012) Programming Graphical User Interfaces in R,CRC Press Taylor & Francis Group
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