What does the ^ (XOR) operator do? [duplicate]
This question already has answers here: What does the caret operator (^) in Python do? (5 answers) Closed 9 months ago. What mathematical operation does XOR perform?
math
Integer division in Java [duplicate]
They are being divided in integer arithmetics. So dividing integer a by integer b you get how many times b fits into a. Also a % b will give you a remainder of a division. So (a / b ) * b + a % b = a
Python division
You’re using Python 2.x, where integer divisions will truncate instead of becoming a floating point number. You should make one of them a float: or from __future__ import division, which the forces / to adopt Python 3.x’s behavior that always returns a float.
How can I use “e” (Euler’s number) and power operation in python 2.7
You can use exp(x) function of math library, which is same as e^x. Hence you may write your code as: I have modified the equation by replacing 1/2 as 0.5. Else for Python <2.7, we’ll have to explicitly type cast the division value to float because Python round of the result of division of two … Read more
numpy max vs amax vs maximum
np.max is just an alias for np.amax. This function only works on a single input array and finds the value of maximum element in that entire array (returning a scalar). Alternatively, it takes an axis argument and will find the maximum value along an axis of the input array (returning a new array). The default behaviour of np.maximum is to take two arrays and compute … Read more
Python Math – TypeError: ‘NoneType’ object is not subscriptable
This should be The .sort() method is in-place, and returns None. If you want something not in-place, which returns a value, you could use Aside #1: please don’t call your lists list. That clobbers the builtin list type. Aside #2: I’m not sure what this line is meant to do: is it simply ? In other words, I … Read more
Unfamiliar symbol in algorithm: what does ∀ mean? [closed]
That’s the “forall” (for all) symbol, as seen in Wikipedia’s table of mathematical symbols or the Unicode forall character (\u2200, ∀).
What is the C++ function to raise a number to a power?
pow() in the cmath library. More info here. Don’t forget to put #include<cmath> at the top of the file.
Converting 3D polar coordinates to cartesian coordinates
Your formula is correct for all angles. But the names that you’ve given the angles are probably not quite right. What you’ve called “horizontal angle” is the inclination angle – the angle between the vector and the z-axis. So if “horizontal angle” is 0, then the point lies on the z-axis, which means that it … Read more
1000 * 60 * 60 * 24 * 30 results in a negative number [duplicate]
You are multiplying ints together, and overflow occurs because the maximum integer is 2^31 – 1. Only after the multiplications does it get converted to a long. Cast the first number as a long. or use a long literal: That will force long math operations from the start.