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F# units of measure to the rescue:

https://msdn.microsoft.com/en-us/library/dd233243.aspx

let convertCtoF ( temp : float<degC> ) = 9.0<degF> / 5.0<degC> * temp + 32.0<degF>

F# units can certainly handle the problem given a fixed matrix size, but for a general method handling arbitrary dimensions you'd need variadic measure arguments, which aren't supported (and would probably require quite a bit of bookkeeping for this particular problem, in any language).

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