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Alan


Last seen: 5 days ago
45 total contributions since 2011

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Question


How do I clear the output from a list of .mlx files to reduce their size?
Live Editor files with their output figures etc. are much larger than those without. If I have a list of .mlx files, and want t...

4 months ago | 1 answer | 0

1

answer

Answered
Creating a diagonal matrix with specific diagonal vectors
Assuming the output matrix is square and N by N, this is what I would do. Assume N=4, and I'd like to set the -1 diag to [1,2,3...

6 months ago | 0

Question


How do I convert a complex ss model to a real ss model
If I have a state space model something like A = [-0.005+sqrt(2)*1i 0 ; 0 -0.005-sqrt(2)*1i]; B = [ -1+1i -1-1i]; ...

6 months ago | 0 answers | 0

0

answers

Answered
Is there a function for argmax?
function y = argmax(x) [~,y] = max(x); end

10 months ago | 0

Question


Centos 7 Install: Help not working right
I have just installed MATLAB 2019a over Centos for the first time. Help is not working as I expect. When I type help, I get hel...

1 year ago | 1 answer | 0

1

answer

Question


arrayfun isreal fails - how to fix?
x = randn(8,1); z = fft(x); assert(isreal(z(1)),'First'); y = arrayfun(@isreal,z); assert(y(1),'Second'); In this snippet, ...

1 year ago | 2 answers | 2

2

answers

Answered
how to constrain tfest to give minimum phase zeros
init_sys = idtf([NaN NaN NaN],[1 NaN NaN NaN]); init_sys.Structure.num.Minimum = 0; init_sys.Structure.den.Minimum = 0; ...

4 years ago | 0

Question


how to constrain tfest to give minimum phase zeros
I am trying to apply the MATLAB ident toolbox function "tfest" to some data. It is returning a non-minimum phase zero, yet I get...

4 years ago | 1 answer | 0

1

answer

Question


How to get good sys ids using n4sid
I have a test problem to try out the n4sid function in the System Identification Toolbox. I have simulated a simple SISO sec...

5 years ago | 0 answers | 0

0

answers

Question


Use a network license if it is available
I have worked out how to combine my Individual Standalone Named User license with a Network Concurrent User license from a serve...

5 years ago | 0 answers | 0

0

answers

Question


Combining standalone license with network license. Using offline.
I would like to use my standalone copy of MATLAB with some Toolboxes for which we have a network license. I installed MATLAB usi...

8 years ago | 1 answer | 0

1

answer

Question


Fonts that work correctly
I have been playing around, in MATLAB 2012b, with setting the fonts in a Figure. I have done this both under OS X and Windows 7,...

8 years ago | 2 answers | 0

2

answers

Solved


Target sorting
Sort the given list of numbers |a| according to how far away each element is from the target value |t|. The result should return...

8 years ago

Solved


Return the largest number that is adjacent to a zero
This example comes from Steve Eddins' blog: <http://blogs.mathworks.com/steve/2009/05/27/learning-lessons-from-a-one-liner/ Lear...

8 years ago

Solved


The Goldbach Conjecture
The <http://en.wikipedia.org/wiki/Goldbach's_conjecture Goldbach conjecture> asserts that every even integer greater than 2 can ...

8 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...

8 years ago

Solved


Remove the vowels
Remove all the vowels in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill' Output s2 is 'Jck nd Jll wn...

8 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 + ...

8 years ago

Solved


Sort a list of complex numbers based on far they are from the origin.
Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear f...

8 years 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...

8 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...

8 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...

8 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...

8 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...

8 years ago

Solved


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...

8 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...

8 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...

8 years 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...

8 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...

8 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. Example...

8 years ago

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