How can I add all of the values of 'n'?

Question

list = []
calc = 1
while int(calc) < 51:
list.append(calc)
calc = int(calc) + 1
for n in list:
n = 1/n**2
print (n).

Right now that will basically print 50 values starting with 1 then 0.25, 0.1111, 0.0625 and so on.... I just want to know, how can I take those values and add them together.

Answer 1

Okay, that's a lot simpler then. You don't need the list or the inner loop.

calc = 1
x = 0
while calc<51:

x += 1/calc**2
calc = calc + 1

print (x)

This would be your code trimmed down.

We prepare x=0, and then, we directly add the part calculation, as you described, to x with each iteration.

Try to play this code through in your mind and see how it does what you prescribed.

(This can be reduced to a single line of code, but that is something you should look forward to learning later. :))

Answer 2

You are printing the result x with every loop.

If you remove the indentation and print x only once, is the result how you expect?

(In case indentation is still tripping you up, you might wanna read (not run) this:

https://code.sololearn.com/cT5BRIbkia21/?ref=app
)

Answer 3

Indentation is absolutely important in Python, because it governs which statements belongs to a block of code (like a loop) and which don't. (In many other languages this is done using curly brackets.

What algorithm is this exactly? I don't know what sort of calculation is supposed to lead to your expected result.

Answer 4

One way is to create a variable before the loop.

set it to 0.

Then, with every run of the loop, you add the value you want to add, either

x = x + yourcalculation

or simply

x += yourcalculation

Answer 5

Uff, a bit new to python, didn't think indentation would play such a big role.

ok bro, so now am getting the single digit that I wanted, but for some reason is way off.

output:
78.38256407636845

and according to my calculations it can't go higher than 2.

am expecting the answer to be:

~1.5024

this is the actual out put of "n":

1.0
0.25
0.1111111111111111
0.0625
0.04
0.027777777777777776
0.02040816326530612
0.015625
0.012345679012345678
0.01
0.008264462809917356
...

and what i want the program to do is this with the data:

1.0 + 0.25 + 0.1111111111111111 + 0.0625 + 0.04 + 0.027777777777777776 + 0.020408163 + ... + 0.0004 = the answer

Answer 6

I am basically trying to calculate a Riemann sum.

from 1 - 50 (1/(x^2))

the calculation is suppose to go like this:

1/(1^2)+ 1/(2^2) + 1/(3^2) + 1/ (3^4) + ... + 1/(50^2) = answer

as of now I was able to get the output for all individual numbers:

1/1= 1, 1/4=0.25, 1/9 = 0.111111, .... , 1/(50^2)= o.ooo4

now what i am trying to do is add all of the numbers to get a single digit.

Basically this:
1.0 + 0.25 + 0.1111111111111111 + ... + 0.0004 = ~ 1.5024

The only output that I want is a float near this:

~1.5024

How can i add the list of these 50 numbers?

Answer 7

hey Honfu... this is what i did know:

list = []
calc = 1
x = 0
while int(calc) < 51:
list.append(calc)
calc = int(calc) + 1
for n in list:
n = 1/n**2
x += n
print (x)

however, answers still came up:

1.0
2.25
3.611111111111111
5.034722222222221
6.498333333333332
....

the output should be the sum of all the previous values, combine to a single output. but i def think we are getting some were, i'll keep playing around with our idea and see if I can figure it out.

Basically what am trying to do is take the **Riemann sum from 1 to 50 of 1/x^2**

Answer 8

you are a god ma dude, thanks man, keep me posted with your codes, I learned a ton from the indent project that you had.