Question

how is abs(x) - ans**3 a decrementing function, as explained in the Lecture 3?

Answer 1

Hang on, I'll have a look at it

Answer 2

This was the code right?

```
#Find the cube root of a perfect cube
x = int(raw_input('Enter an integer: '))
ans = 0
while ans*ans*ans < abs(x):
ans = ans + 1
#print 'current guess =', ans
if ans*ans*ans != abs(x):
print x, 'is not a perfect cube'
else:
if x < 0:
ans = -ans
print 'Cube root of ' + str(x) + ' is ' + str(ans)
```

Answer 3

so ans increases by 1 each time the code within the whele loop is carried oud
so
abs(x) = constant in the loop
the first time ans = 0 , so the value of the Decrematial function is abs(x)
the second time ans = 1 , so ....................................................is abs(x)-1
the third time ans = 3 .......................................................... abs(x)-8
and so on

Answer 4

okay, i sort of understood this, but my expectation was to have a line of code like `abs(x) - ans**3` in the python code.

So this means that the decremented function need not be a line of code, we have to figure out a decremented function.

Answer 5

Thatś right

Answer 6

thanks for quick help, r u taking this course or have already completed?

Answer 7

No I'm doing it right now
I'm working on problem set 4 at the moment

Answer 8

Iǘe fanned you, so that I can find you back as someone who is also doing this course at the moment
Its nice to discuss the material now and then