add duplex option to make.cards

[maxheld83]

make.cards() is best printed on both sides, so that you have the stimulus on front, and ID/handle on the back.

Some printers support duplex printing, and for that purpose, it would be very helpful to be able to export PDFs where every page was rendered twice, because printer drivers usually do not support this kind of thing. (you can enter n of copies, but that'll be printed after the first batch).

Not sure how to implement this:

• either in LaTeX (if there is such an option as repeat page, unlikely)
• in R / xtable, just repeating the respective rows twice, though that would depend on the type of template (maybe hard code the n of cards / page per template into make.cards.R.)
  • so this would basically be some simple function that repeats some subset of rows twice, where the number of rows depends on the template (ie. how many rows fit on a template, which would have to be hard-coded dependending on the template somewhere in make.cards()

Would make printing on duplex a lot easier.

@VerenaKasztantowicz maybe you want to look into this, since this will be especially handy for image-sorts?

[VerenaHeld]

+1 That would be nice as a new argument in R... I'm thinking about it.

[maxheld83]

@VerenaKasztantowicz can you try this out, too? It's in the make-cards-conveniences branch. Will merge it if it works for you, too.

[VerenaHeld]

It's working @maxheld83 thx

[maxheld83]

great, done :)