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# Turlough Hughes

##### Last seen: 1 day ago
212 total contributions since 2019

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Increase matrix size, with the first matrix a the center of the new matrix
There is a function made specifically for this called padarray, try the following example: A = rand(2000); B = padarray(A,[100...

14 days ago | 0

Rescale points plotted using scatter3 based on their distance from the origin
Yes. Firstly get distances from the origin: d = sqrt(sum(A.^2,2)); If you have the machine learning & statistics toolbox, you...

28 days ago | 0

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Extracting specific rows with different content from a large table array
Tnew = T(T.MatDate>=SpecificDay-30 & T.MatDate<=SpecificDay+10,:);

28 days ago | 1

How to pick the values from individual grids ?
The objective is to create an excel sheet with columns of data having different length. You can store data that has different le...

1 month ago | 1

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Sample a 3D surface
If I understand correctly, you just want to generate some x,y values that match your z values (i.e. b): [x,y] = meshgrid(1:size...

1 month ago | 1

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vectorizing or speeding looped code
This should help, though I've already made assumptions about the sizes of arrays. How many rows/columns are in each variable? X...

1 month ago | 0

Efficiently calculating sum-thresholds across vector
You could do the following but with the caveat that it assumes samples are all positive values runningSum = cumsum(samples); i...

1 month ago | 0

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how to use an if statement to determine whether an index is out of bounds
If indices is outside of bounds, I want to display ''Error: index is out of bounds.' The conditional expression in your if bloc...

1 month ago | 0

How can I create different colors in the plotted chart for a lot of data
I'm coming at this from a slightly different angle. You can interactively highlight different lines by setting up a slider in th...

1 month ago | 1

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how to get character from an array using another logical array?
A slight modification on your inputs: V = ['1b.%291x g'; 'yig&aaSgwa'; 'tqtbbs!?R!']; logicalVec = logical([ 1 0 1 0 1 0 1 ...

1 month ago | 0

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How to find the most frequently repeated time interval?
First I read in data as a string array opts = detectImportOptions(filename,'TextType','string'); opts.SelectedVariableNames = ...

1 month ago | 1

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How to find a corresponding matrix value
You can get the corresponding values in W as follows [mQ,idx] = max(Q,[],2,'linear') W(idx)

1 month ago | 1

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Question

Issue with browser slowing down while using MATLAB answers
While writing/editing answers on the forum, I've been having issues where the tab in my google chrome browser that's in use beco...

3 months ago | 1 answer | 0

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How to select different colors and legend for the bar plot??
For the first part of your question, you can do so as follows: x = rand(3,2); h = bar (x); h(1).FaceColor = 'red' h(2).FaceC...

3 months ago | 1

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averaging the matrix and creating an averaged matrix
As far as I understand you want the average of each 5 rows by 10 columns hence the expected output size of 53x101. You can do th...

3 months ago | 0

Solved

Side of a rhombus
If a rhombus has diagonals of length x and x+1, then what is the length of its side, y? <<http://upload.wikimedia.org/wikipe...

4 months ago

Solved

Dimensions of a rectangle
The longer side of a rectangle is three times the length of the shorter side. If the length of the diagonal is x, find the width...

4 months ago

Solved

Area of an Isoceles Triangle
An isosceles triangle has equal sides of length x and a base of length y. Find the area, A, of the triangle. <<http://upload...

4 months ago

Solved

Is this triangle right-angled?
Given three positive numbers a, b, c, where c is the largest number, return *true* if the triangle with sides a, b and c is righ...

4 months ago

Solved

Find a Pythagorean triple
Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

4 months ago

Solved

Is this triangle right-angled?
Given any three positive numbers a, b, c, return true if the triangle with sides a, b and c is right-angled. Otherwise, return f...

4 months ago

Solved

Length of a short side
Calculate the length of the short side, a, of a right-angled triangle with hypotenuse of length c, and other short side of lengt...

4 months ago

Solved

Natural numbers in string form
Create a cell array of strings containing the first n natural numbers. _Slightly_ harder than it seems like it should be. Ex...

4 months ago

Solved

Fix the last element of a cell array
Note: this is lifted directly from <http://www.mathworks.com/matlabcentral/answers/82825-puzzler-for-a-monday Puzzler for a Mond...

4 months ago

Solved

String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
<http://www.mathworks.com/help/matlab/characters-and-strings.html String array> and cell array are two types of containers for s...

4 months ago

Solved

Cell Counting: How Many Draws?
You are given a cell array containing information about a number of soccer games. Each cell contains one of the following: * ...

4 months ago

Solved

Remove element(s) from cell array
You can easily remove an element (or a column in any dimension) from a normal matrix, but assigning that value (or range) empty....

4 months ago

Solved

Convert a Cell Array into an Array
Given a square cell array: x = {'01', '56'; '234', '789'}; return a single character array: y = '0123456789'

4 months ago

Solved

Split a string into chunks of specified length
Given a string and a vector of integers, break the string into chunks whose lengths are given by the elements of the vector. Ex...

4 months ago

Solved

Convert a numerical matrix into a cell array of strings
Given a numerical matrix, output a *cell array of string*. For example: if input = 1:3 output is {'1','2','3'} whic...

4 months ago