Answered

What is wrong with my vector calculator code?

Hi Hunter, When I run your code, I get the following outputs: xnew = [-0.3090;-0.3090] ynew = [-0.9511;0.9511] zne...

What is wrong with my vector calculator code?

Hi Hunter, When I run your code, I get the following outputs: xnew = [-0.3090;-0.3090] ynew = [-0.9511;0.9511] zne...

1 year ago | 0

Question

Quiver3 resets axes automatically?

I'm using the quiver3 function in a for loop, and each time I am replotting the arrows in different locations. However, I want t...

1 year ago | 0 answers | 1

Question

How to correctly order polygon vertices?

I have a set of vertices [x,y] for a specific polygon. I want to use the inpolygon function to determine points within the polyg...

2 years ago | 1 answer | 0

Answered

reshape the dimension of a matrix

The simple answer is no, those arrays do not have the same number of elements. But if you can explain why you want to reshape th...

reshape the dimension of a matrix

The simple answer is no, those arrays do not have the same number of elements. But if you can explain why you want to reshape th...

2 years ago | 0

Solved

Set the array elements whose value is 13 to 0

Input A either an array or a vector (which can be empty) Output B will be the same size as A . All elements of A equal to 13...

2 years ago

Solved

Check if number exists in vector

Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

2 years ago

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Most nonzero elements in row

Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

2 years ago

Solved

Weighted average

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

2 years ago

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Sum the 'edge' values of a matrix

Sum the 'edge' values of an input matrix (the values along the perimeter). Example [1 2 3 4 5 6 7 8 9] Output = ...

2 years ago

Solved

Create times-tables

At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

2 years ago

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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...

2 years ago

Solved

Fibonacci sequence

Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

2 years ago

Solved

Area of a Square

Inside a square is a circle with radius r. What is the area of the square?

2 years ago

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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...

2 years ago

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The Hitchhiker's Guide to MATLAB

Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

2 years ago

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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...

2 years ago

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Cannon Ball

Given g (acceleration due to gravity) and desired altitude x, find the minimum ground velocity of a cannon ball to reach x.

2 years ago

Solved

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...

2 years ago

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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 ...

2 years ago

Solved

Remove any row in which a NaN appears

Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

2 years ago

Solved

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...

2 years ago

Solved

Select every other element of a vector

Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

2 years ago

Question

Generate pdf distribution with bias

I'm curious if anyone knows how to bias a probability density function. For example, I want to create a pdf from vector A, but I...

2 years ago | 1 answer | 0

Question

Distance between two functions

I'm creating multiple probability density functions (pdfs), comprised of x and y values, and would like to compare these to anot...

2 years ago | 2 answers | 0

Solved

Column Removal

Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

3 years ago

Solved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

3 years ago

Solved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

3 years ago

Solved

Determine if input is odd

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

3 years ago

Solved

Pizza!

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

3 years ago