integrate() (PR#1754)

This happens:

integrate(function(x)1,0,1)

Error in integrate(function(x) 1, 0, 1) : evaluation of function gave a result
of wrong length

...

This is clearly incorrect behavior.  I included case 2 to show that some cases
are
working correctly.

This is user error.  The help for integrate says the first argument is
"An R function taking a numeric first argument and returning a
numeric vector the same length."  

The function has to return a vector answer when a vector argument is
given to it.

Duncan Murdoch

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