Answered

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...

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...

2 months ago | 0

Answered

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...

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...

2 months ago | 0

| accepted

Answered

Extracting specific rows with different content from a large table array

Tnew = T(T.MatDate>=SpecificDay-30 & T.MatDate<=SpecificDay+10,:);

Extracting specific rows with different content from a large table array

Tnew = T(T.MatDate>=SpecificDay-30 & T.MatDate<=SpecificDay+10,:);

2 months ago | 1

Answered

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...

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...

2 months ago | 1

| accepted

Answered

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...

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...

2 months ago | 1

| accepted

Answered

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...

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...

2 months ago | 0

Answered

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...

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...

2 months ago | 0

| accepted

Answered

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...

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...

2 months ago | 0

Answered

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...

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...

2 months ago | 1

| accepted

Answered

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 ...

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 ...

2 months ago | 0

| accepted

Answered

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 = ...

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 = ...

2 months ago | 1

| accepted

Answered

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)

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)

2 months ago | 1

| accepted

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...

4 months ago | 1 answer | 0

Answered

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...

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...

4 months ago | 1

| accepted

Answered

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...

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...

4 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...

5 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...

5 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...

5 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...

5 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...

5 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...

5 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...

5 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...

5 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...

5 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...

5 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: * ...

5 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....

5 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'

5 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...

5 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...

5 months ago