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Darren Wethington


Last seen: 2 years ago |  Active since 2018

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How to resolve error using erfinv: Input must be real and full?
I'd put a brakpoint at line 173 or run it with the option "Pause on Errors" selected. What are the values of Tc and TaveS(i+1,1...

4 years ago | 0

Question


nlparci() resid length
The documentation for nlparci() says the following: "The confidence interval calculation is valid for systems where the length ...

4 years ago | 1 answer | 0

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answer

Question


Selecting Elements of a Matrix by Indexing with a Vector
I have a 100x3 matrix and I'd like to select one element from each row to form a 100x1 vector. Given a vector of 100 indeces be...

4 years ago | 2 answers | 0

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answers

Answered
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)); ...

5 years ago | 0

Solved


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

5 years ago

Answered
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...

5 years ago | 0

Question


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...

5 years ago | 2 answers | 1

2

answers

Answered
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...

5 years ago | 0

Question


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...

5 years ago | 0 answers | 1

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Question


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...

5 years ago | 2 answers | 0

2

answers

Question


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 ...

6 years ago | 1 answer | 0

1

answer

Solved


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

6 years 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 ...

6 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...

6 years 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. Examp...

6 years ago

Solved


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

6 years ago

Answered
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...

6 years ago | 1

Solved


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

6 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...

6 years 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...

6 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...

6 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...

6 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...

6 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 ...

6 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...

6 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:...

6 years ago