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# Paul Johnson

##### Last seen: 7ヶ月 前
41 2020 年以降の合計貢献数

#### Paul Johnson's バッジ

Find the point of intersection of tangents.
Given two points on a conic, find the point of intersection of the corresponding tangents. The conic is given in Cartesian co...

8ヶ月 前 | 0 | 3 ソルバー

Find the shortest distance between a point and a straight line.
Given the Cartesian coordinates of three points A, B and C (in a flat Euclidean space), find the shortest distance between the ...

8ヶ月 前 | 1 | 7 ソルバー

Kepler's Equation
Solve <http://en.wikipedia.org/wiki/Kepler's_equation Kepler's Equation>. Note that the solution is rounded down to 5 decima...

8ヶ月 前

Calculate the height of an object dropped from the sky
Assume that an object is dropped from 1000 meters above the surface of the earth at time t=0. The object is dropped such that t...

8ヶ月 前

Problem editing a draft Cody problem.
Hello, I have saved some draft Cody problems, but I am unable to edit these drafts. A message appears to the effect that "some...

9ヶ月 前 | 0 件の回答 | 0

### 0

Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

9ヶ月 前

Indexed Probability Table
This question was inspired by a Stack Overflow question forwarded to me by Matt Simoneau. Given a vector x, make an indexed pro...

9ヶ月 前

Project Euler: Problem 1, Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23...

9ヶ月 前

Bullseye Matrix
Given n (always odd), return output a that has concentric rings of the numbers 1 through (n+1)/2 around the center point. Exampl...

9ヶ月 前

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

9ヶ月 前

Knight's Tour Checker
Given a matrix a, determine whether or not a legal <http://en.wikipedia.org/wiki/Knight's_tour knight's tour> is present. The kn...

9ヶ月 前

Given a and b, return the sum a+b in c.

9ヶ月 前

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Examp...

9ヶ月 前

Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

9ヶ月 前

Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

9ヶ月 前

Is my wife right?
Regardless of input, output the string 'yes'.

9ヶ月 前

Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

9ヶ月 前

Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

9ヶ月 前

Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

9ヶ月 前

Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

9ヶ月 前

Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

9ヶ月 前

Inner product of two vectors
Find the inner product of two vectors.

9ヶ月 前

Get the length of a given vector
Given a vector x, the output y should equal the length of x.

9ヶ月 前

Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

9ヶ月 前

Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

9ヶ月 前

Back to basics 6 - Column Vector
Covering some basic topics I haven't seen elsewhere on Cody. Given an input vector, output true or false whether it is a colu...

9ヶ月 前

Sum the numbers on the main diagonal
Sum the numbers on the main diagonal of an n-by-n matrix. For input: A = [1 2 4 3 6 2 2 4 7]...

9ヶ月 前

Area of a circle
Find the value for area of the circle if diameter is given

9ヶ月 前

Vectors counting by 2
Create a vector numbers from 7 to 15 in increments of 2

9ヶ月 前

find the maximum element of the matrix
for e.g x = [1 2; 3 4] y = 4

9ヶ月 前