Sam Marshalik

MathWorks

Last seen: 10 days ago | Active since 2013

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Simple parfor loop slow
I don't think ThreadPool will help here. I ran the code in a Process pool and a Thread pool and the runtime was somewhat simila...

3 months ago | 0

| accepted

Answered
Handling memory when working with very huge data (.mat) files.
You are likely running out of memory on the workers. You are not using sliced input variables (Sliced Variables - MATLAB & Simu...

3 months ago | 0

Answered
Failed to Start MJS services on 1 of 1 hostnames
This MATLAB Answer should help you resolve this error.

1 year ago | 0

Answered
Parallelizing For Loops - Issue
You may be able to put the contents of the parfor-loop into a separate function and calling that function from that parfor-loop....

1 year ago | 0

Answered
Distributed array to solve a system of linear equations on a cluster
Hey Melissa, I would not think of distributed arrays as a way to speed up your computation. Distributed arrays are useful for ...

3 years ago | 0

Answered
Why AdditionalPaths of batch() do not work on Web-App-Sever / Parallel Server
Hey Olaf, is this the workflow you are trying to set up: You created an app in Appdesigner which submits a batch job to MATLAB ...

3 years ago | 0

Answered
What Parallel Computing Toolbox functionality can be used without breaking the code for users without PCT?
You are correct that parfor will run as a serial for-loop without Parallel Computing Toolbox. Starting in R2021...

3 years ago | 1

| accepted

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Matlab Parallel Computing - lockdown test error
Can you provide a bit more information as to what you are doing and where you are seeing this error? Can you describe your work...

3 years ago | 0

Answered
Starting Parallel pool on a cluster
I would suggest to reach out to the MathWorks Technical Support team to troubleshoot this. You can reach them by phone or e-mai...

3 years ago | 0

Solved

Convert from Fahrenheit to Celsius
Given an input vector |F| containing temperature values in Fahrenheit, return an output vector |C| that contains the values in C...

4 years ago

Solved

Calculate Amount of Cake Frosting
Given two input variables |r| and |h|, which stand for the radius and height of a cake, calculate the surface area of the cake y...

4 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:...

4 years ago

Submitted

Parallel Computing Hands-on Workshop
Learn how you can solve computationally and data intensive problems using multicore processors, GPUs, and compute clusters.

4 years ago | 5 downloads |

Solved

Which values occur exactly three times?
Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...

8 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...

8 years ago

Solved

How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

9 years 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".

9 years ago

Solved

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

9 years 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...

9 years ago

Solved

Summing digits
Given n, find the sum of the digits that make up 2^n. Example: Input n = 7 Output b = 11 since 2^7 = 128, and 1 + ...

9 years ago

Solved

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

9 years 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...

9 years 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.

9 years 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...

9 years 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...

9 years 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...

9 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...

9 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...

9 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...

9 years 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...

9 years ago

Sam Marshalik

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