Questions tagged [operation]
734 questions
-1
votes
1 answer
analysis of algorithm
Assume a machine has a throughput of 70 ops/s. Say we have an algorithm with time complexity
T(n) = 2n^2 + 120
Determine how many hours will it take the machine to execute said algorithm for an input of size n = 8.
Is this correct?
T(n) = 2n^2 +…
toky
- 119
- 1
- 5
- 15
-2
votes
1 answer
Comparison Operation of List Data Structure on Python
Assuming that I have a List data strecture: list.
And I see one code: list[:,0]>5
I don't know what it means? But I know what list[:,0] means.
I google it and read many in python.org but I can't acquire appropriate answer.
Kk Lee
- 1
- 1
-2
votes
2 answers
-2
votes
2 answers
Python Sum with 3 nested list and empty list Explanation
l = [ [[1,2,3], [2,3,4]] ]
sum(l,[])
Output ist
[[1, 2, 3], [2, 3, 4]]
I don't know why it works like this.
I tired the two below
[].__add__(l) # First Try
[] + l # Secodn Try
In both cases, the output was as follows.
[[[1, 2, 3], [2, 3,…
조해피
- 7
- 2
-2
votes
4 answers
I can't figure out what is wrong with this function?
This is what it should return
Returns True if all items are truthy.
Examples:
>>> all_true([1, True, 'oregonstate'])
True
>>> all_true([0, 1, 2])
False
"""
This is what I have written
def all_true(items):
for i in items:
if i == True:
…
Jack
- 1
-2
votes
1 answer
using ternary operation instead of if statement
I want to do this code you have seen using ternary operation instead of if conditional blocks. Generally, is the use of the ternary operator always a good choice? In some places they say it is more readable and more flexible code to use the ternary…
zordu-nickim-agzivi-sikm
- 193
- 1
- 2
- 14
-2
votes
1 answer
UnboundLocalError: local variable 'infile' referenced before assignment
I am having difficulties tracing an error in my code. Getting a "UnboundLocalError: local variable 'infile' referenced before assignment" error all the time I enter a file name that do not exist.
def spam():
fname = input('Enter the file name:…
Tomas
- 1
-2
votes
1 answer
Scipy and pulp which will be better if using cplex solver
Which among python libraries like pulp and Scipy , has the capability to work with Cplex solver .If we have huge constraints and datasets for optimisation in supply chain .
Badhoria
- 1
-2
votes
1 answer
Problem doing multiplication operation in a select between a float and an integer in sqlite
Problem
Hi, I have this problem when I do this operation between a float and an integer number.
select codventa, cantidad, precio, cantidad * precio from
ventas v, detallesventas dv
where v.codventa = 23 and dv.codventa = v.codventa
Instead of…
diego
- 3
- 2
-2
votes
6 answers
Set Intersection with None
I am having trouble with set operation intersection.
Assume I have a list A = [0,1,2,3], and an integer B = 0. When I check if B in A:, I am getting of course True.
But when A and B are as default equal to None, than I can't do the intersection…
oakca
- 1,408
- 1
- 18
- 40
-2
votes
2 answers
How to perform math operation on numbers in string of python
How we can perform mathematical operation on string in python.
Consider below example
with open('/home/akashk/projects/math.txt') as f:
content = f.readlines()
content = [x.strip() for x in content]
for x in content:
print(x)
…
Akash Kinwad
- 704
- 2
- 7
- 22
-2
votes
2 answers
Python multiplication operation returns false repeating decimal
I was doing my program for a school project when I encountered a problem which I'm unable to understand after trying many different methods to resolve it. I have a function that does a simple mathematical operation like this:
def pikkus(kogupikkus,…
harlu
- 9
- 3
-2
votes
5 answers
Use aggregate function with arithmetic operation
I have a table with two columns
Here I need to find a SQL according to the following function,
Z = accelx-AVG(accelx) for every rows.
-2
votes
1 answer
error: invalid operands to binary expression 'float'
Hello and sorry if this question has been asked before, but I'm working on the Josephus problem and this is the code that I´ve written.
#include
#include
#include
int main(void)
{
printf("Number of people: ");
…
carlos1106
- 1
- 1
-2
votes
1 answer
Java operating long numbers
Have been doing a mathematic example in java which would find all numbers between number1 and number2(including number1 and number2) that divide numbers 2 ,3 or 5. I don't need all those numbers, just how many numbers there are.
So for example if…
user2838068
- 1
- 1