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Question
How can I select every variable in my workspace?
I am sifting through a data set that is so big it keeps crashing my computer. I imported the data which took several hours so it...
bijna 8 jaar ago | 0 answers | 0
0
answersQuestion
How do I reduce this nxmx3 matrix to a (n*m)x3 matrix?
I am running simulations in which I solve a system of 3 equations and 3 unknowns for n values of a parameter, with m random gues...
ongeveer 8 jaar ago | 1 answer | 0
1
answerQuestion
How do I use fsolve n*m times in a 3-dimensional array without messing up my dimensions?
I am searching for solutions to a system of three equations, three unknowns. The system is called eqs and is a function of a(1),...
ongeveer 8 jaar ago | 1 answer | 0
1
answerSolved
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...
meer dan 8 jaar ago
Question
Trying to solve system of equations in a for loop. What is happening with my arguments?
I am trying to solve eqs, which is a system of 3 equations and 3 unknowns, for multiple values of the parameter S. functi...
meer dan 8 jaar ago | 1 answer | 0
1
answerQuestion
Why is S=t/10 acceptable and S=t/100 giving me an error term?
I am trying to vary the parameter S from 0.17 to 1.00 by increments of 0.01 and solve for r. I can get it to go from 1.7 to 10 i...
meer dan 8 jaar ago | 1 answer | 0
1
answerSolved
Pizza value using expression with parentheses
Pizza prices are typically listed by diameter, rather than the more relevant feature of area. Compute a pizza's value (cost per ...
meer dan 8 jaar ago
Solved
Who knows the last digit of pi?
There is only one man who knows the last digit of pi, who is that man? Give the name of that man, who, by popular believe, can ...
meer dan 8 jaar ago
Solved
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".
meer dan 8 jaar ago
Solved
Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]
meer dan 8 jaar ago
Solved
Circle area using pi
Given a circle's radius, compute the circle's area. Use the built-in mathematical constant pi.
meer dan 8 jaar ago
Solved
Simple equation: Annual salary
Given an hourly wage, compute an annual salary by multiplying the wage times 40 and times 50, because salary = wage x 40 hours/w...
meer dan 8 jaar ago
Solved
Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0
meer dan 8 jaar ago
Solved
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...
meer dan 8 jaar ago
Solved
Return the 3n+1 sequence for n
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...
meer dan 8 jaar ago
Solved
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...
meer dan 8 jaar ago
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.
meer dan 8 jaar ago
Solved
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...
meer dan 8 jaar ago
Solved
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...
meer dan 8 jaar ago
Solved
Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...
meer dan 8 jaar 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...
meer dan 8 jaar 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...
meer dan 8 jaar 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...
meer dan 8 jaar ago
Solved
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...
meer dan 8 jaar 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...
meer dan 8 jaar ago
Solved
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. Example...
meer dan 8 jaar ago
Solved
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 ...
meer dan 8 jaar ago
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 ...
meer dan 8 jaar 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...
meer dan 8 jaar ago