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# Darren Wethington

23 2018 年以降の合計貢献数

#### Darren Wethington's バッジ

Getting values from 4d matrix according (using) 2d matrix with logical values (0 or 1) - does not work as wanted
See if this is what you're looking for: A = rand(10,20,30,40); B = round(rand(10,20)); four_dim_logical = zeros(size(A)); ...

Kaprekar Steps
6174 is the <http://en.wikipedia.org/wiki/6174_%28number%29 Kaprekar constant>. All natural numbers less than 10,000 (except som...

problem with optimoptions with fmincon
Your problem is working as you expect it on my machine. The problem for me is the LogLikelihood11 function is iterating at ~2 s...

Why is det(x) better than rcond(x) in determining non-singularity here?
The code below demonstrates the following problem: Analytically, the matrix x is NOT singular [1]. Matlab believes it is singu...

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Events not consistently triggering with ODE45
I've been digging around Matlab's ODE Events and searching documentation this week when I came across this question. I was able...

3ヶ月 前 | 0

Why does this ODE yield two events?
I have the following simple ODE: With initial condition x(0)=5, I am interested in when x(t)==1. So I have the following eve...

3ヶ月 前 | 0 件の回答 | 1

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How would I check to see if a struct field exists OR is empty?
I'd like to program a conditional statement that checks if an optional events function for an ODE was triggered. This would loo...

3ヶ月 前 | 1 件の回答 | 0

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Bounded Confidence Intervals from nlparci
I've calculated parameter values to a model using lsqcurvefit(). These parameters have lower bounds of 0, which I've specified ...

10ヶ月 前 | 1 件の回答 | 0

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

12ヶ月 前

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 ...

12ヶ月 前

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...

12ヶ月 前

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...

12ヶ月 前

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

12ヶ月 前

Not enough input arguments error in nlinfit
When passing arguments to nlinfit, you've (correctly) passed your inputs as one variable, "inputs". Now my_fun will take "initi...

12ヶ月 前 | 1

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

12ヶ月 前

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

12ヶ月 前

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...

12ヶ月 前

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...

12ヶ月 前

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...

12ヶ月 前

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...

12ヶ月 前

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 ...

12ヶ月 前

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...

12ヶ月 前

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:...

12ヶ月 前