Question

Which MATLAB operations/functions need speeding up?
When using MATLAB, I sometimes come across a performance bottleneck caused by functionality that I believe could be much faster....

12 years ago | 23 answers | 3

23

answers

Answered
How should I compute the eigenvectors of a sparse, real, symmetric matrix?
Just convert the matrix to a full one, and use eig. Unless less you want just a few eigenvectors, then the decomposition using t...

12 years ago | 0

| accepted

Question

How should I compute the eigenvectors of a sparse, real, symmetric matrix?
I need to compute all the eigenvectors of a sparse, real, symmetric matrix, A. I've tried the following: >> [V, D] = eig...

12 years ago | 3 answers | 0

3

answers

Answered
Requirements for using parfor across multiple desktop PCs
You need a licensed copy of MATLAB and the Parallel Computing Toolbox on the PC running the parfor loop, and you need a licensed...

12 years ago | 0

| accepted

Question

Requirements for using parfor across multiple desktop PCs
I have several desktop PCs running Windows, connected over a network, all with access to a common file system. I would like to d...

12 years ago | 1 answer | 0

1

answer

Problem

Index one element in each vector of an array along a given dimension
Functions like min and max can return in their second output argument the index of the element in each vector along a particular...

12 years ago | 10 | 56 solvers

Answered
problem with errorbars and export_fig
Export_fig exports error bars just fine. Try: x=1:10; y=x.^2-2*rand(size(x)); err=abs(x.^2-y); errorbar(x,y,err,...

12 years ago | 1

| accepted

Solved

Animated GIF Creator
This Challenge is to execute the Function Template which has a fully functional Animated GIF creator of a shape related to a Zer...

13 years ago

Answered
Placing plots into multiple page pdf document
The <http://www.mathworks.co.uk/matlabcentral/fileexchange/31215-appendpdfs append_pdfs> function can concatenate separate pdf f...

13 years ago | 1

Answered
How to define paper orientation in export_fig for pdfs
The export_fig submission <http://www.mathworks.co.uk/matlabcentral/fileexchange/23629-exportfig description>, help text and the...

13 years ago | 0

Answered
Best way to share code within laboratory
We use a version controlled repository, stored on a central server.

13 years ago | 0

Answered
Mix raster / vector in ps / pdf plots
I believe <http://www.mathworks.com/matlabcentral/fileexchange/727 exportfig> (which is different from <http://www.mathworks.com...

13 years ago | 0

Question

How do I change figure mode programmatically?
My figure has the rotate/zoom tool selected, and I wish to deselect it programmatically. How can I do this?

13 years ago | 1 answer | 1

1

answer

Answered
Create a figure -exactly- a certain size
export_fig (or rather, print) appears to only export that part of the figure which is on screen. Make the figure small and use t...

13 years ago | 0

| accepted

Answered
Multiple “File Exchange” Animated GIF codes work for R2010a but not for R2011a
<http://www.mathworks.com/matlabcentral/fileexchange/32546-im2gif im2gif> works fine in R2012a

13 years ago | 0

Answered
Text size in figure on the screen vs when saving as png
Try using <http://www.mathworks.com/matlabcentral/fileexchange/23629 export_fig> as follows: export_fig -painters -r200 t...

13 years ago | 0

Answered
convert .fig to .jpg based on the ROI
<http://www.mathworks.com/matlabcentral/fileexchange/23629-exportfig Export_fig> automatically crops whitespace around figures b...

13 years ago | 0

| accepted

Answered
Clearing handle subclasses with timer objects
per isakson is right, but I'll add more info here: The anonymous function does save a reference to class object. This in itse...

13 years ago | 3

Question

Clearing handle subclasses with timer objects
Save this class: classdef test_class < handle methods function this = test_class() fprintf('Hell...

13 years ago | 2 answers | 0

2

answers

Solved

Choose the best fitting dominoes
You will be given a cell array of nx2 matrices. Choose one row from each matrix. These are the ordered pairs that will be plac...

14 years ago

Solved

Scoring for oriented dominoes
Given a list of ordered pairs, and the order they should be placed in a line, find the sum of the absolute values of the differe...

14 years ago

Answered
export_fig Warning: RGB color data not yet supported in Painter's mode
I added a paragraph in this issue to the export_fig webpage: http://sites.google.com/site/oliverwoodford/software/export_fig ...

14 years ago | 0

Answered
execution of external program fails
I suggest you use the ghostcript function that comes with export_fig. It uses a full path if it needs to, but sets it automatica...

14 years ago | 0

Answered
Help with exporting pcolorm with shading interp
If possible, use <http://www.mathworks.com/matlabcentral/fileexchange/11368-uimage-uimagesc uimagesc> instead of pcolorm. It wil...

14 years ago | 0

Answered
How to find the linear distance between two points say (x,y) and (m,n) on an image?
p1 = [x; y]; p2 = [m; n]; d = norm(p1 - p2);

14 years ago | 3

Solved

Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

14 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 ...

14 years ago

Solved

How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

14 years ago

Solved

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...

14 years ago

Solved

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

14 years ago