On 3 Jan 2011, at 15:09, Paul Bergstrom <[email protected]> wrote:
> Why does this give me the error "undefined method `-' for" as an action
> in a controller but works fine as a helper?
Is values the same in both cases (what is it)? What is the type of the object
upon which - can't be called?
>
> count = values.size
> mean = values.inject(:+) / count.to_f
> stddev = Math.sqrt( values.inject(0) { |sum, e| sum + (e - mean) ** 2 }
> / count.to_f )
>
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