Total number of cells in R numeric dataframe
My best two attempts so far only got me down to 11 characters. I'd love to see fewer than @Spacedman's 10!

&gt;sum( `[&lt;-`(x,,,1) )
[1] 15600

&gt;sum(!(F&amp;x))
[1] 15600


Got it!

sum(x^0)
[1] 15600