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adding 2D array to 3D array
An example: A = randi(100,3,1,4) B = A(:,:,[1 1:end]) Alternatively, you can do the concatenation just using cat() C = cat(3...

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adjust brightness of image
Consider the following examples. Note the changes to the image, the changes to the transfer function shape and endpoint locatio...

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I am trying to use imshow to take data in a .txt file and print out the image made from the data.
I'm going to guess that this is the same homework assignment. If not, similar operations should apply. The example only shows ...

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Create image from pixels using two vectors and their grayscale value
I'm pretty sure there are other ways to do this, but here's one way. % build example image and position data A = imread('coi...

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Mean squared error and NMSE
The title is about NMSE, but there's no mention of it. I'll refer to both. How to back calculate the reference from an estim...

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rgb2gray by 5*5 vicinity marix
Errors aside, this doesn't even look complete. [filename, pathname]=uigetfile('*.*','Select the image file'); Address=strcat(p...

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Insert and write row with condition
I'm sure there are other ways, but here's one example. % create test array nb = 4; sb = 4; A = [rand(nb*sb,2)*1000 rand(nb*s...

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making repetitive code less clunky
You could simplify this with a loop if you wanted, though I'm sure there are other ways. Bear in mind what I mentioned in my co...

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each columun of a 2D matrix multiply with a 3D array
This is something, but I bet there are other ways too. This is about 10x faster on my hardware/version, but only about 2-3x fa...

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Copy-pasting variables (values) to edior in 2021b
Just don't rely on some sort of automagic formatting of pasted content. If you want to save an array variable as a literal cons...

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To save each of sub-indices (luminance, contrast and structure) in SSIM
Unless you need something special, you should be able to do this with standard syntax for ssim(). Mind you, the SSIM is the mea...

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please give me answer what is wrong
Use elementwise division. x = 0:0.1:103; y = ((28*log(x) - 2*x - 12*x.^2.*log(x) - 4*x.^3.*log(x) - 12*x.*log(x) - 2*x.^2 - (2...

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How to turn text into numbers
Well I'm sure there are more robust ways, but if all the file ever has is those two lines in that specific order with that speci...

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How to close open contours
The contours are open because that's what describes the data. To close the contours misrepresents the behavior of the data at t...

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Problme with Text analysis
I'm terrible with regex, but this might get you somewhere. Replaces everything but lowercase alpha and underscores. A = {'9.ba...

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I am missing the test signal "WashingMachine-16-8-mono-200secs.mp3" from the denoise example.
That should be included with the audio toolbox after R2019a. The files should be in $MLROOT/toolbox/audio/samples/ where $MLRO...

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Segment Image and Save as New Picture
You can't have an image of "just the dog", in the sense that the image must be a rectangular array. The background must be some...

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what is a(n) MATlab code that can help me calculate the volume of a cylinde then increase that result by 20% to get a result of 18m.
h0 = 15; dV = 0.2; hf = h0*(1+dV); fprintf('Oh my god, it''s %.2f meters tall! Aieee!',hf)

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How to normalize signal to have mean=0 and amplitude 0 to 1
If you have a dataset where the mean is zero and the amplitude is within the interval [0 1], then the entire dataset is zero-val...

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Remake this without a loop
What's wrong with just using the test you're already doing? In the case you've given, the vector is unnecessary. A(A >= 1.5) =...

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Adding a row vector into the diagonal of another vector with m, n dimensions using for loop.
Actually, using a loop was pretty dang simple, now that I tried it. A = randi(9,5,10); b = 11:20; diagonalthing(A,b) dia...

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How to get the centerline of a binary region
There's this. A = imread('arc.png')>128; B = bwmorph(A,'skel',inf); % skeletonize B = imfill(B,'holes'); % get rid of any...

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how to remove [0,0,0] cell from an array
Consider: C = {rand(2,3) rand(3,3) rand(4,3) [0 0 0] rand(5,3)}.' iszerotuple = cell2mat(cellfun(@(x) isequal(x,[0 0 0]),C,'un...

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grazing goat problem, how much of the area can the goat graze ?
Your answer is reasonable. As a point of verification: rf = 1; rg = 0.8; % intersection point locations % could also use ...

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How are the indices computed in gray2ind(...)?
Here's an example for a uint8 image: A = imread('cameraman.tif'); maplength = 32; [B bmap] = gray2ind(A,maplength); % as...

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make a matrix out of list
It's not really clear if you want the contents of the file to be read into an array, or whether you just want a numeric (or othe...

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Adding noise to image and removing it with average filter
The line mentioned in the error is certainly nonsensical, but afaik it shouldn't actually throw an error (at least in R2009b - R...

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Why isn't my matrix being filled?
When you define a function, you need to describe its input arguments and output arguments. This function definition has no in...

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Menu command list of colors converted to integers
I know this is part of the other question, but to clarify, the menu() command simply returns the index of the selected element w...

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Convert nested text cell array
I'm sure there's a simpler way, but idk. This will convert to a table. Note that the table columns are cell vectors. This i...

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