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# Seth DeLand

### MathWorks

80 total contributions since 2011

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Solved

5th Time's a Charm
Write a function that will return the input value. However, your function must fail the first four times, only functioning prope...

4 months ago

Solved

Ned's Queens
A tribute to Cody's five-year anniversary should also celebrate the people behind Cody, and in this particular case, our illustr...

4 months ago

Solved

The 5th Root
Write a function to find the 5th root of a number. It sounds easy, but the typical functions are not allowed (see the test su...

4 months ago

Submitted

Optimization in MATLAB: An Introduction to Quadratic Programming
Files used in "An Introduction to Quadratic Programming" Webinar

1 year ago | 25 downloads |

Submitted

Analyzing Fleet Test Data using MATLAB
Files from the webinar "Analyzing Fleet Test Data using MATLAB"

1 year ago | 3 downloads |

Submitted

Mixed-Integer Linear Programming in MATLAB
MATLAB files from the webinar

1 year ago | 17 downloads |

Submitted

Files for the 2012 Webinar "Tips and Tricks - Getting Started Using Optimization with MATLAB"
These are the files that were used for the demonstrations in the webinar.

1 year ago | 9 downloads |

Submitted

CVaR Portfolio Optimization
Conditional Value at Risk (CVaR) portfolio optimization with the PortfolioCVaR object

1 year ago | 13 downloads |

Submitted

Optimal Component Selection Using the Mixed-Integer Genetic Algorithm
Use the mixed-integer genetic algorithm to solve an engineering design problem.

1 year ago | 39 downloads |

Solved

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

1 year ago

Solved

Model a mass spring system
Model an ideal mass-spring system shown below where the spring is initially stretched. <<http://blogs.mathworks.com/images/se...

2 years ago

Solved

Make a half wave rectifier
Produce a signal that outputs the given sine wave source when it is greater than zero and outputs zero when it is less than zero...

2 years ago

Solved

Produce a cosine wave
Produce the following signal: <<http://blogs.mathworks.com/images/seth/cody/cosine-eqn.png>>

2 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:...

2 years ago

Integer Programming
Solve linear programming problems with integer variables.

3 years ago | 59 clicks |

Optimizing FLC with GA
Hi Michael, Here's an <http://www.mathworks.com/help/gads/examples/coding-and-minimizing-a-fitness-function-using-the-genetic...

3 years ago | 0

Solved

Text processing - Help Johnny write a letter home from camp
Johnny overuses the word 'great'. Write a script that will help him with this and future letters. If a sentence contains more ...

3 years ago

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...

4 years ago

how can i solved mixed integer linear programming using genetic algorithm in matlab
If your objective function and constraints are linear, I highly recommend using the mixed-integer linear programming solver in O...

4 years ago | 0

how to implement MILP in matlab
As of R2014a, Optimization Toolbox has a mixed-integer linear programming solver: <http://www.mathworks.com/help/optim/ug/intli...

4 years ago | 0

| accepted

Numerical packing
Seeing how Optimization Toolbox has a mixed-integer solver in R2014a, I figured I would post this alternate solution that uses <...

4 years ago | 3

simultaneous linear equations minimization by linprog command
The summation of the variables being equal to a constant could be taken care of by an equality constraint. In that case, your A...

4 years ago | 0

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...

4 years 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]

4 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.

4 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...

4 years ago

I'm trying to write a bit of user friendly code where the user is prompted to enter file names and the names will be stored in an array. However, I keep getting errors. Can someone fix this code below?
Two things that I think will help: 1) Use a cell array to store the names of the files rather than an array. This will be ea...

4 years ago | 0

| accepted

How do I find all the positive roots of (e^(-.2x ))(cos(2x))-.15x^2+1
2 things: 1) fzero is designed to find a single zero at a time. You will need to loop through each value for x0 and record the ...

5 years ago | 0

Genetic Algorithm - Plotting fitness values
PlotFcns needs to be passed in as an option for ga: problem.options.PlotFcns = @gaplotbestf;

5 years ago | 1

| accepted