Problem 554. Is the Point in a Circle?

Created by Kuifeng

Solve Later

Check whether a point or multiple points is/are in a circle centered at point (x0, y0) with radius r.

 Points = [x, y]; 
 circle = (x0, y0, r)

Return true or false for each point tested

Solve

Solution Stats

1302 Solutions
279 Solvers

Last Solution submitted on Feb 27, 2020

Last 200 Solutions

Problem Comments

6 Comments

6 Comments

Show 3 older comments

Stefan on 3 Apr 2012

error in the test:

assert(isequal(your_fcn_name(x),y_correct))
Error: Undefined function or variable 'x'.

Should be:

assert(isequal(your_fcn_name(Points,circle),y_correct))

Ned Gulley on 3 Apr 2012

I went ahead and fixed the calling syntax on that.

Kuifeng on 4 Apr 2012

Thanks for the corrections!

Abdelhak ARESMOUK on 5 Dec 2012

You should correct the first test!

Li Ding on 22 Oct 2017

The first test case is wrong.

Rafael Hernandez-Walls on 20 Nov 2017

The first test case is wrong, is FALSE

Solution Comments

Solution 1462334

1 Comment

1 Comment

David Verrelli on 4 Apr 2018

A valid, compact submission. [But note that the function used here was first
introduced in R2017b, and not available to Cody Players before circa Sept 2017.]

Solution 1407749

2 Comments

2 Comments

Bob Tivnan on 6 Jan 2018

I thought "in" a circle meant interior...the 3rd test is ON the circle.

David Verrelli on 4 Apr 2018

I agree that the Problem Statement was, at best, ambiguous on this detail — or, at worst, misleading. As a separate matter, the example should consistently use brackets, not a mixture of brackets and parentheses.

Solution 1137443

1 Comment

1 Comment

David Verrelli on 4 Apr 2018

Exploits somewhat limited number of tests within Test Suite. Please add additional tests. You may also consider including some random elements in the input vectors. E.g. Points = [0, rand/2] instead of (or as well as) the existing Points = [0, 0.5] in the first test. It won't necessarily 'prevent' all exploits, but it will make them much less attractive.

Solution 1124295