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Adam


1,819 total contributions since 2014

Professional Interests: Signal Processing, OOP, Matlab GUI programming, Machine Learning

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Answered
multiply table and matrix
Why all the complications with cell arrays and tables? Just use numeric arrays: A = [0.2 0.5 0.3; 0.1 0.1 0.3]; B = [2;3]; C...

11 hours ago | 1

Answered
Randomly change certain characters of a character matrix
If you mean basic letters, then e.g. idx = randi( numel( yourCharArray ), 1000, 1 ); replacementChars = char( randi( 26, 1000,...

2 days ago | 0

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Answered
How can I use Function handle with arrays?
Not really sure how the code you posted, with syms and matlabFunction is connected to what you are asking, but this function sho...

10 days ago | 0

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Select all eelements equal to a number
b = x( 1:find( x == 4, 1, 'last' );

10 days ago | 0

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Answered
Turning separate columns of data into a single column or vector.
times = []; for ... ... times = [ times; A.data(:,1) ]; ... end You will get warnings about variable growing in...

10 days ago | 0

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Answered
Apply an element-wise calculation of an equation to a matrix
log( X ./ Y ) ./ Z 100 ./ log( X ./ Y ) - 50

10 days ago | 0

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Find function for cell array
wantedArray = [1,122,185]; cellfun( @(x) isequal(x,wantedArray), myCell ); You would be better off using a numeric array thoug...

16 days ago | 1

Answered
What are the thought processes that go on when you are trying to solve a MATLAB problem?
I make very heavy use of the debugger, in combination with the command line to try out syntax and options. I also often like to...

22 days ago | 1

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Answered
Accesing structure using a function
total = campus.( building ).( year ).( var ); should work fine, assuming campus is your struct and that is a branch of the stru...

22 days ago | 0

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Answered
how to get the RGB number from colorbar
colourmap = colormap( hAxes ); where hAxes is the axes handle. gca if you really must! You can then interpolate it to make it...

1 month ago | 0

Answered
How can I change variables within a GUI to make plot using the data from user input?
Simplest option is simply to create variables g = []; valzero = []; (or initialise them to a default value) at the top of y...

1 month ago | 0

Answered
Accept a specific type of file Matlab
doc uigetfile gives examples of specifying filters for file type. You can use a generic uigetfile and a check like that after ...

1 month ago | 0

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Find the index of given value in an array
val = 2.5; idxAboveVal = find( array >= val, 1 ); idxFract = idxAboveVal - ( array( idxAboveVal ) - val ) / ( array( idxAboveV...

1 month ago | 1

Answered
Call to Subplot is Adding Axis to Current Figure
Yes, that does seem a slightly odd thing to have in the startup file and is indeed the cause of this behaviour (I just tested wi...

1 month ago | 0

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Answered
plz i need help to make this , thank u
[~, idx] = min( MA ); resA = A(:,idx);

1 month ago | 0

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Answered
Random order, but equally appearance
doc randperm

1 month ago | 1

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Answered
How to recognize if there is in a character a point '.'?
What is wrong with simply xx == '.' if xx is a char array rather than a string as it seems to be?

2 months ago | 0

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What does 'Colormap' do to the image with double/float pixels?
Data is linearly binned into however many bins/elements your colourmap has and that colour applied. e.g. if your data is 0-1 an...

2 months ago | 0

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Answered
Writing a Matrix 6x6 in one line
A = 1:36; I may be misunderstanding the question, but if not then it would seem to be that simple? or A = A(:)'; if you are ...

2 months ago | 0

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Answered
Feature Request: Refactoring tool
This is still such a huge frustration all the way into R2019a. Even things that should be so simple can take on epic proportion...

2 months ago | 1

Answered
Undefined operator '+' for input arguments of type 'function_handle'.
A2 = V2a + U2(t) ; would be a function call. You only use the @(t) when defining a function handle, not when actually calling...

2 months ago | 0

Answered
MATLAB Answers Wish-list #4 (and bug reports)
One or two things with respect to notification preferences and Activity Feed that I would like: Having a preference to not auto...

2 months ago | 3

Answered
Ylim is not working
Use explicit axes handles for plotting instructions and instructions like hold, ylim, xlim. i.e. hAxes(1) = subplot(3,1,1); sc...

2 months ago | 1

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Answered
How to set the x-aixs when plotting with certain row and column of matrix
I'm surprised you can see anything useful on that using plot rather than an image, but the plot function takes multiple argument...

2 months ago | 0

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Answered
Undefined variable or class error
The variable in your mat file is called NEWSST, not NEWSST_2015. It is usually better though to load a mat file into a struct a...

2 months ago | 0

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Answered
How to hide a figure instead of deleting it?
If you over-ride the CloseRequestFcn you can have it do whatever you tell it. In general you should always have this function c...

2 months ago | 1

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Answered
Given an instance of a class (without knowing class name), how to call the constructor?
Since your class doesn't inherit from handle the assignment operator will give you a copy of the correct class. However, this w...

2 months ago | 0

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Create a specular colormap
figure; imagesc( rand(100) - 0.5 ); % Random data centred on 0 baseCmap = hot( 256 ); cmap = [ flip( baseCmap(2:end,:) ); base...

2 months ago | 1

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Answered
calculate the mean square error
Calculate the error, square it and calculate the mean! mean( ( a - b ).^2 );

2 months ago | 0

Answered
How to keep for loop from over writing variables?
You aren't indexing anything on the left-hand side of all those lines, which is the side where things are stored/overwritten. e....

2 months ago | 0

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