# Johan

Last seen: 1 year ago Active since 2021

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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...

1 year ago

How to reduce the computation time of for loop?
You can likely vectorize your code: i_loop = 3264:64:86610 ; M = size(i_loop,1); N = 25; Freq_vec = rand(N,1); Turntable_an...

2 years ago | 0

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Deleting rows of a matrix based on values from another matrix
You can use ismember() to do that: A = randi(5,5,3) B = randi(5,2,1) % Find all the row where col 1 to 2 of A have a value in...

2 years ago | 0

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while solving a couple ordinary differential equation, I'm getting an error of Unable to perform assignment because the left and right sides have a different number of element
func2 and func4 uses A1 and A2 respectively which means they are using the whole arrays, either call A1 and A2 in the func defin...

2 years ago | 0

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Is it possible to explode/expand a map? i.e. separate the countries by a given distance (such as exploding a pie chart)
You could scale the regions around there geometric centers. There are builtin matlab tool using the polyshape structure that can...

2 years ago | 0

Data splitting and saving to different variables
You can use structure to do that, you can read more about it in the matlab help https://fr.mathworks.com/help/matlab/ref/struct....

2 years ago | 1

finding a specific element based on conditions
1) Your data are row vectors and not column vectors which is why your table statement does not lead to what you expect. Tran...

2 years ago | 0

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How to repeat value in Cell using MATLAB
Hello, I don't know if there is a builtin matlab function to do what you want, this should work: Value = {1,2,3} Count = {2,1,...

2 years ago | 0

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Project Euler: Problem 1, Multiples of 3 and 5
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23...

2 years ago

how to fill a new vector after a if condition?
I would convert your segment coordinates to points, this way points that are not unique would show that the segment is not an en...

2 years ago | 0

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Speeding up integration within nested for loops
One trick I know to increase speed of calculation is to vectorize your code. I'm not sure that would work for you but you could ...

2 years ago | 0

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Merging Cell Array Elements in One Element
test= [{'1A'} {'2B'} {'3C'} {'4D'}] {cell2mat(test')}

2 years ago | 0

Storing elements of product in a row matrix and extracting the nonzero elements
The problem of your code is that you assign the results of your multiplaction to n, which mean that you will only store the last...

2 years ago | 0

Solved

Implement simple rotation cypher
If given a letter from the set: [abc...xyz] and a shift, implement a shift cypher. Example: 'abc' with a shi...

2 years ago

Combining two vectors into a new one
I don't know if there is a builtin function to do that but you can achieve using translation, logical condition and find: A = ...

2 years ago | 1

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How to write an 'if' script that changes a function depending on x?
you need to use elseif for secondary condition in your if statement: function y=funk(x) if x <= 3; y=sin...

2 years ago | 0

How do I calculate the moment of force due to a load distribution or at least get a point of application?
Assuming you have an XY array of data, dividing it in two part can be done by filtering the data against a chosen criteria: XYd...

2 years ago | 0

what is the efficient way to search for value in a large struct
I'm not sure that fits what you want but you could try making large arrays in a small structure instead of the opposite: tree(1...

2 years ago | 0

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Word Counting and Indexing
You are given a list of strings, each being a list of words divided by spaces. Break the strings into words, then return a maste...

2 years ago

Making a Surface plot transparent
I think FaceAlpha does work but your mesh size is so small that you only see the edges plotted which are not transparent in your...

2 years ago | 0

How to improve my inefficient code?
(modified from comment to get rid of empty rows) Maybe this would work for you ? %transform your table in an array workdat...

2 years ago | 0

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How to reduce code lines for data post-processing by using for-loops?
You can use structure to organize your data and simplify your analysis. For example you can define the path of the file you want...

2 years ago | 1

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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...

2 years ago

Solved

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

2 years ago

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Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

2 years ago

Solved

Combinations without using nchoosek
You have to generate a matrix with all possible combinations of n elements *taken 2* at a time, *without using nchoosek(1:n,2)* ...

2 years ago

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Check whether a Wordle guess is consistent with previous feedback
The game Wordle resembles the classic game Mastermind. Players try to guess a five-letter word, and after each guess they are to...

2 years ago

Solved

Generate a vector like 1,2,2,3,3,3,4,4,4,4
Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

2 years ago

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Triangle sequence
A sequence of triangles is constructed in the following way: 1) the first triangle is Pythagoras' 3-4-5 triangle 2) the s...

2 years ago

Solved

Length of the hypotenuse
Given short sides of lengths a and b, calculate the length c of the hypotenuse of the right-angled triangle. <<https://i.imgu...

2 years ago