doc.filename = "addSubtitle_example.pptx"
options( "ReporteRs-fontsize" = 24 )
doc = pptx( title = "title" )
doc = addSlide( doc, slide.layout = "Title Slide" )
#set the main title
doc = addTitle( doc, "Presentation title" )
#set the sub-title
doc = addSubtitle( doc , "This document is generated with ReporteRs.")
writeDoc( doc, file = doc.filename )
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