# Adam

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

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**Content Feed**

Resize and sum a matrix

If you have the Image Processing Toolbox you can use blockproc something like the following: array2 = blockproc( array1, [n n],...

9 months ago | 2

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Whats the difference when using [ ] and : ?

key = [1 2 3 4 5 6 7 8 9 10]; res = reshape( key, 2, [] ); would give res = [ 1 3 5 7 9 2 4 6 8 10 ]; The [] indica...

10 months ago | 1

Get row and column of the closest value of a matrix from a variable

If you are using an up to date version of Matlab (scanning the release notes I think R2019a or later for the particular syntax o...

1 year ago | 0

How to round the decimal values?

ceil( 0.7954 * 1000 ) / 1000 It should also be noted though that many seemingly 'round' decimal numbers cannot be perfectly rep...

1 year ago | 0

Problem with loop index

Calculate the indices of all the rows you want to delete , then delete them all in one go afterwards, as e.g. rowsToDelete = [...

1 year ago | 1

How to remove outlier by 2.5 standard deviations from the mean?

Looking at the help in doc filloutliers this should work: filloutliers(A,'center','mean','ThresholdFactor', 2.5) replacing A...

1 year ago | 1

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How to make subplot accept the positions like matrix?

doc ind2sub This will convert linear indices to n-dimensional subscripts. e.g. [p(1), p(2)] = ind2sub( [3, 3], 2 );

1 year ago | 1

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input vector fra edit text in guide GUI

sscanf( str, '%d' ) or str2num( str ) would both work if the input is e.g. "1 2 3 4 5 6", although the first returns a column...

1 year ago | 0

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Defining a time varying function

if t < t0 result = a; else result = b; end gives what you want for this simple case, provided t0, a, b and t are al...

1 year ago | 0

i have different result

Just get rid of the loop and vectorise: ProbDG=1-(1./T); DGT=-log(-log(ProbDG)); It can be done in a loop, but it's the end o...

1 year ago | 0

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What are the options to use a script in app designer? and how to define it?

You don't have to, but you should want to as scripts are not suitable for going beyond just trying things out. Once you want to...

1 year ago | 0

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How to get handle to legend in a specific axes?

Legends are parented by the figure, not the axes, so you get a list of figure children like this: >> get( gcf, 'Children' ) an...

1 year ago | 0

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Combine two or more gaussian components into one Gaussian Mixture (gmdistribution)

Doesn't GC = gmdistribution( [muX; muY], cat( 3, SX, SY ), [1; 1] ); work?

1 year ago | 0

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divide 3d matrix (840,64,1536) by 1d matrix (1536,1)

A ./ reshape( B, [1 1 1536] );

1 year ago | 1

How do I extract the rows that have value 0 in one array from another new array?

newArray( ~thisArray, : ) where thisArray is the one you show here.

1 year ago | 1

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What type of data (200 x 200 x 200)

It's an array. A 3d array to be precise, but just an array. A vector (as defined by isvector(...) )is an nx1 or 1xn array A m...

1 year ago | 1

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" bsxfun(@rdivide..." Explain Use in Code

rgbh_e = bsxfun(@rdivide, rgbh_e, rgbh_e(4,:)); divides rgbh_e by by the 4th row of rgbh_e, on a per row basis - i.e. each elem...

1 year ago | 0

In which Matlab version was rng() introduced?

https://uk.mathworks.com/help/matlab/release-notes.html?rntext=rng&startrelease=R2006a&endrelease=R2019b&groupby=release&sortby=...

1 year ago | 1

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what is wrong with my script?

2:4 means [2, 3, 4] A( [2 4], [2 4] ) would give what you want.

1 year ago | 1

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Arguments block syntax not being recognised

This was only introduced in 2019b (you can see at the bottom of the help page for 'arguments'). It is one of the disadvantages ...

1 year ago | 1

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Matrix creation combining vectors

M = [ repmat( V1(:), [numel(V2), 1] ), repelem( V2(:), numel( V1 ) ) ];

1 year ago | 0

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Help with restricting input

validateattributes( number, { 'numeric' }, { 'scalar', '>=', 1, '<=', 100, 'integer' } ) You would have to put a message togeth...

1 year ago | 0

MATLAB Answers Wish-list #5 (and bug reports)

I realised I posted this in the ancient wishlist thread before. Can we not have some white space back between answers? Since t...

1 year ago | 1

How to ignore letters in a numeric cell?

cellfun( @(x) str2double( erase( x, 'mm' ) ), pin_radius ) should convert them to an array of doubles. If you are using pre R2...

1 year ago | 1

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why do I get Array indices must be positive integers or logical values?

It means pretty much exactly what it says. In Matlab x1, as you create it, is an array of values representing your function at ...

1 year ago | 0

expand length of matrix to fixed value

t = interp1( 1:108, t, linspace(1, 108, 200 ) ); would be one way to do it.

1 year ago | 1

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Create a plot with a drop down menu in an App

app is your main application object. You can add properties to this yourself, which you can then access in any of its functions...

1 year ago | 1

Area plot does not recognize colormap

What was your 'older Matlab version'? If you keep the handle from an area plot you get an object (or objects, if you feed it a ...

1 year ago | 0

Wish-list for MATLAB Answer sections.

Well, after the last update of Matlab Answers my biggest wish is now to put the white space back between the answers! I don't k...

1 year ago | 0