Python in a Nutshell

Name

reduceat

Synopsis

                        u.reduceat(a,indices)

Returns an array r with the same type code as a and the same shape as indices. Each element of r is the reduction, with the function or operator underlying u, of elements of a starting from the corresponding item of indices up to the next one excluded (up to the end, for the last one). For example:

print add.reduceat(range(10),(2,6,8)) # prints: [14 13 17]

Here, r’s elements are the partial sums 2+3+4+5, 6+7, and 8+9.