Problem with a calculation as an action

rubyonrails-talk
1

Why does this give me the error "undefined method `-' for" as an action in a controller but works fine as a helper?

count = values.size mean = values.inject(:+) / count.to_f stddev = Math.sqrt( values.inject(0) { |sum, e| sum + (e - mean) ** 2 } / count.to_f )

2

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?

3

I solved it. The values where strings not integers.