A parabola (/pəˈræbələ/; plural parabolas or parabolae, adjective parabolic, from Greek: παραβολή) is a two-dimensional, mirror-symmetrical curve, which is approximately U-shaped when oriented as shown in the diagram below, but which can be in any orientation in its plane. It fits any of several superficially different mathematical descriptions which can all be proved to define curves of exactly the same shape.
One description of a parabola involves a point (the focus) and a line (the directrix). The focus does not lie on the directrix. The parabola is the locus of points in that plane that are...
Task
Write a program or function that will determine if a point in 3D space lies on a 2D parabolic curve.
Input
3 points in 3D space
vertex of a 2D parabolic curve
arbitrary point on the curve
arbitrary point in space
Input may be taken in any form (string, array, etc.) provided no other...
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Implement a function diff that takes as input three integers x, y, and z. It should return whether subtracting one of these numbers from another gives the third.
Sloppy Shuffle
Write a program that will shuffle the numbers from 1 to 52. Rather than from your language's random facility, the result will be determined by the input. But not in any particular way -- however you choose! The shuffle does NOT need to be uniform.
The Rules
Each submission shou...
Look at the following diagram:
Using Kirchhoff's law, you can see that i1 + i4 = i2 + i3.
Given two lists, one with all the currents entering the junction and one with all the currents leaving the junction except one, output the last one.
Testcases:
[1, 2, 3], [1, 2] = 3
[4, 5, 6], [7, 8] =...
Show me your OOP
popularity-contests
Your task is to implement OOP that have this feature:
Inheritance (Single dispatch)
Class
Your submission have to translate this pseudo-code into your languages.
class Animal{
Animal(string name){
printLn("An animal has summoned " + name);
...
Mathematica, 19 bytes
1&#@pxE+0&0+Log@#&1
Reversed:
1&#@goL+0&0+Exp@#&1
This was interesting to golf! Mathematica has no line comments / implicit sting endings, so I couldn't take the simple route. Instead, I used the fact that 0 + x == 0 and that 1 x == x, no matter what x is! Testing:
In...
Create a program, wich generates and prints out a pseudo random noise, like perlin or simplex noise. Anything goes, value noise, perlin noise, even implementations of the voronoi noise is okay.
Rules
You need to take in the size of the noise with stdin (if your language doesn't have one, e.g....0
This is a virtually identical challenge to Paint Starry Night, objectively, in 1kB of code, but with a different image. Starry Night is quite blurry in appearance and has large areas of fairly uniform colour, whereas this one has lots of high-contrast detail. Will this change the nature of the mo...
183
Sort by Multiplying
Your should write a program or function that given a list of positive integers multiplies each element with the smallest positive integer possible to create a strictly increasing list.
For example if the input is
5 4 12 1 3
the multiplications will be
5*1=5 4*2=8 12*1=12...
