Finding response in 4D array

Hello,

I'm currently using the "Signal Prosessing Toolbox" to find the best comparison between some experiments. The resulting fit matrix is attached and for example if the best result is 72.3901 I want to extract the position as (2,1). I'm having some problems figuring out how to get this value. Would I be better off reshaping the array?

Any help is appreciated

Regards Andreas