Row sum?

[Afif Khaja]

What's wrong with this code? It's giving me an out of range error when sum += a[m][n]:

 

# find row sums of 2d array
def rowsum(a,m,n):
    rsum = [0.0 for i in range(m)]
    for i in range(m):
        sum = 0
        for j in range(n):
            sum += a[m][n]
        rsum[i] = sum
    return rsum

 

a = [[4,3,2],
     [2,4,6],
     [7,1,5]]

print rowsum(a,3,3)

[S.F. Kyale]

it looks like you're referencing the bottom left item in the array continuously.

a[m][n] will always be the maximum row, maximum column.

If you use a, you should be getting 15 all the way (5+5+5).

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[Jeremy Kun]

Soren is right. You need to use the indexing variables i and j you defined, not the limits n and m (which will always be one past the maximum allowable index).

Jeremy Kun

Mathematics Graduate Student

University of Illinois at Chicago

[Afif Khaja]

I see. Thanks