[Jprogramming] Return of max of list and it's index in single pass

['Jon Hough' via Programming]

I want to get the max value of a list, and return the first index of its 
occurrence in the list, tacitly.

My solution

 maxWithIndex =: {.@:I.@:(= >./), >./

works ok, but calculates >./ twice. Is there a tacit way to do this with only a 
single calc of >./ ?

Thanks,
Jon
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