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# Sarah McDonald

### Cornell University

20 total contributions since 2015

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Solved

Square a Number
Given an input x, return y, which is equal to the square of x.

5 years ago

Problem

Square a Number
Given an input x, return y, which is equal to the square of x.

5 years ago | 1 | 430 solvers

Problem

Create a Standard Size Vector
Given an input x, create a row vector y from 1 to x with 5 elements.

5 years ago | 0 | 94 solvers

Solved

Create a Matrix of Zeros
Given an input x, create a square matrix y of zeros with x rows and x columns.

5 years ago

Problem

Create a Matrix of Zeros
Given an input x, create a square matrix y of zeros with x rows and x columns.

5 years ago | 5 | 330 solvers

Problem

Exponential Growth vs. Decay
Given a constant k, write an exponential change equation y and determine the value of y when t = 50. Assume that y initial equal...

5 years ago | 0 | 0 solvers

Problem

Create a Standard Size Vector
Given an input x, create a vertical vector y from 1 to x with 5 elements.

5 years ago | 0 | 0 solvers

Solved

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.

5 years ago

Solved

Return the first and last character of a string
Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...

5 years ago

Solved

Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

5 years ago

Solved

Circle area using pi
Given a circle's radius, compute the circle's area. Use the built-in mathematical constant pi.

5 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...

5 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...

5 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...

5 years ago

Solved

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

5 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...

5 years ago

Solved

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

5 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 ...

5 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

5 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:...

5 years ago