Summing rows of a 2D list without using sum function in python
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I have a listed called numbers and I am writing code to sum the rows then sum the result of those sums (i.e. sum the column). I am supposed to write the code without the sum function. What I have so far is pasted below. It gives me close to the right output but is just slightly off and I don’t know what the deal is.
total=0
for row in numbers:
for i in row:
total+=int(i)
print(total)
grandtotal=0
for cols in row:
grandtotal+=total
print(grandtotal)
python
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
add a comment |
I have a listed called numbers and I am writing code to sum the rows then sum the result of those sums (i.e. sum the column). I am supposed to write the code without the sum function. What I have so far is pasted below. It gives me close to the right output but is just slightly off and I don’t know what the deal is.
total=0
for row in numbers:
for i in row:
total+=int(i)
print(total)
grandtotal=0
for cols in row:
grandtotal+=total
print(grandtotal)
python
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
2
What's the input? What output are you expecting? What are you actually getting?
– Carcigenicate
Nov 23 '18 at 13:14
You aren't calculating the sum of each row separately.
– PM 2Ring
Nov 23 '18 at 13:15
The input is numbers=[1,1,-2][-1,-2,-3][1,1,1]. The output I’m getting is 0, -6, -3 for the sums and -9 for the grand total. I should be getting 0, -6, 3, and -3.
– Ace Savage
Nov 23 '18 at 13:23
add a comment |
I have a listed called numbers and I am writing code to sum the rows then sum the result of those sums (i.e. sum the column). I am supposed to write the code without the sum function. What I have so far is pasted below. It gives me close to the right output but is just slightly off and I don’t know what the deal is.
total=0
for row in numbers:
for i in row:
total+=int(i)
print(total)
grandtotal=0
for cols in row:
grandtotal+=total
print(grandtotal)
python
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
I have a listed called numbers and I am writing code to sum the rows then sum the result of those sums (i.e. sum the column). I am supposed to write the code without the sum function. What I have so far is pasted below. It gives me close to the right output but is just slightly off and I don’t know what the deal is.
total=0
for row in numbers:
for i in row:
total+=int(i)
print(total)
grandtotal=0
for cols in row:
grandtotal+=total
print(grandtotal)
python
python
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
edited Nov 23 '18 at 13:25
Ace Savage
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
asked Nov 23 '18 at 13:11
Ace SavageAce Savage
204
204
2
What's the input? What output are you expecting? What are you actually getting?
– Carcigenicate
Nov 23 '18 at 13:14
You aren't calculating the sum of each row separately.
– PM 2Ring
Nov 23 '18 at 13:15
The input is numbers=[1,1,-2][-1,-2,-3][1,1,1]. The output I’m getting is 0, -6, -3 for the sums and -9 for the grand total. I should be getting 0, -6, 3, and -3.
– Ace Savage
Nov 23 '18 at 13:23
add a comment |
2
What's the input? What output are you expecting? What are you actually getting?
– Carcigenicate
Nov 23 '18 at 13:14
You aren't calculating the sum of each row separately.
– PM 2Ring
Nov 23 '18 at 13:15
The input is numbers=[1,1,-2][-1,-2,-3][1,1,1]. The output I’m getting is 0, -6, -3 for the sums and -9 for the grand total. I should be getting 0, -6, 3, and -3.
– Ace Savage
Nov 23 '18 at 13:23
2
2
What's the input? What output are you expecting? What are you actually getting?
– Carcigenicate
Nov 23 '18 at 13:14
What's the input? What output are you expecting? What are you actually getting?
– Carcigenicate
Nov 23 '18 at 13:14
You aren't calculating the sum of each row separately.
– PM 2Ring
Nov 23 '18 at 13:15
You aren't calculating the sum of each row separately.
– PM 2Ring
Nov 23 '18 at 13:15
The input is numbers=[1,1,-2][-1,-2,-3][1,1,1]. The output I’m getting is 0, -6, -3 for the sums and -9 for the grand total. I should be getting 0, -6, 3, and -3.
– Ace Savage
Nov 23 '18 at 13:23
The input is numbers=[1,1,-2][-1,-2,-3][1,1,1]. The output I’m getting is 0, -6, -3 for the sums and -9 for the grand total. I should be getting 0, -6, 3, and -3.
– Ace Savage
Nov 23 '18 at 13:23
add a comment |
1 Answer
1
active
oldest
votes
You need to reset total back to zero for each row. And since you aren't saving the row totals anywhere you need to accumulate the grandtotal at the end of each row loop, not in a separate loop
numbers = [
[1, 1, -2],
[-1, -2, -3],
[1, 1, 1],
]
grandtotal = 0
for row in numbers:
total = 0
for i in row:
total += i
print(total)
grandtotal += total
print(grandtotal)
output
0
-6
3
-3
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You need to reset total back to zero for each row. And since you aren't saving the row totals anywhere you need to accumulate the grandtotal at the end of each row loop, not in a separate loop
numbers = [
[1, 1, -2],
[-1, -2, -3],
[1, 1, 1],
]
grandtotal = 0
for row in numbers:
total = 0
for i in row:
total += i
print(total)
grandtotal += total
print(grandtotal)
output
0
-6
3
-3
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
add a comment |
You need to reset total back to zero for each row. And since you aren't saving the row totals anywhere you need to accumulate the grandtotal at the end of each row loop, not in a separate loop
numbers = [
[1, 1, -2],
[-1, -2, -3],
[1, 1, 1],
]
grandtotal = 0
for row in numbers:
total = 0
for i in row:
total += i
print(total)
grandtotal += total
print(grandtotal)
output
0
-6
3
-3
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
add a comment |
You need to reset total back to zero for each row. And since you aren't saving the row totals anywhere you need to accumulate the grandtotal at the end of each row loop, not in a separate loop
numbers = [
[1, 1, -2],
[-1, -2, -3],
[1, 1, 1],
]
grandtotal = 0
for row in numbers:
total = 0
for i in row:
total += i
print(total)
grandtotal += total
print(grandtotal)
output
0
-6
3
-3
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
You need to reset total back to zero for each row. And since you aren't saving the row totals anywhere you need to accumulate the grandtotal at the end of each row loop, not in a separate loop
numbers = [
[1, 1, -2],
[-1, -2, -3],
[1, 1, 1],
]
grandtotal = 0
for row in numbers:
total = 0
for i in row:
total += i
print(total)
grandtotal += total
print(grandtotal)
output
0
-6
3
-3
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
answered Nov 23 '18 at 13:28
PM 2RingPM 2Ring
43.9k441101
43.9k441101
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
add a comment |
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
This worked like a charm - thank you so much!
– Ace Savage
Nov 23 '18 at 13:51
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
LOL, you got it. I’m obvi a newb.
– Ace Savage
Nov 23 '18 at 14:08
add a comment |
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2
What's the input? What output are you expecting? What are you actually getting?
– Carcigenicate
Nov 23 '18 at 13:14
You aren't calculating the sum of each row separately.
– PM 2Ring
Nov 23 '18 at 13:15
The input is numbers=[1,1,-2][-1,-2,-3][1,1,1]. The output I’m getting is 0, -6, -3 for the sums and -9 for the grand total. I should be getting 0, -6, 3, and -3.
– Ace Savage
Nov 23 '18 at 13:23