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Why the results are different when use different letters?
They are not the same. syms rs xs rp xp; [rp,xp] = solve( rs*rp^2+rs*xp^2 == xp^2*rp, xs*rp^2+xs*xp^2 == rp^2*xp) syms a b...

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How do I define the y axis of imagesc as integers and not fractions?
What Simon says is correct. If you only want the center ticks, you can specify them explicitly: A = rand(2,6); imagesc(A); y...

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Skewed Data when Scaling axis with imagesc()
When setting x and y inputs to imagesc() or image(), the entire x,y vectors are not used. Imagesc considers only the first and ...

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Concatenate strings and numbers
Strings and chars are different. Take care in how you combine them. MaxRows = 10; String1 = num2str(MaxRows) % a char vector ...

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How do I resolve this error?
Which error? I see a number of errors in the function definition and console. This looks like you took a function you found so...

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How to extract positive, negative and fraction numbers from string?
Since it was never clarified, I'm going to ignore sci/eng notation: str = '+100 -100 100 100.1 100.001 1.001 .001 100.'; B = s...

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I want to run this code?
I can't test anything, since there are missing functions, but: % there is no linespace() %[X,Y] = meshgrid(linespace(0,1,N),li...

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Why am I not able to plot this?
Three things: How are you calling the function? This file contains code prior to the function header, so it's not a function f...

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what value should i give for hsize and sigma in fspecial (gaussian) function???
Unless you have other needs, just pick a sigma value and then calculate hsize like so: sigma = 20; % this depends on your needs...

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How to flip non-zero elements of an array and keep zero elements at initial position?
I'm sure there's something simpler, but this is what my sleeplessness created: A = [1:5 0; 11:14 0 0; 21:23 0 0 0; 31 0 32 0 33...

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logical operation on matrix
I'm going to assume that the text question is what you're after: A = randi([100 999],10,10) % a bunch of integers mk = A>=500 ...

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problem with creating video from black and white images
What is class(image) and [min(image) max(image)] ? Because if the images are logical (or unit-scale floating point) the...

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RGB to YUV conversion
If all you want is Y, then just lumapict = rgb2gray(rgbpict); This calculates the luma (Y) based on the constants specified in...

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Image contrast when using labeloverlay
Try putting your images on a common scale. im = mat2gray(im); C = mat2gray(C); This will put both images in the range [0 1]...

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Returning an array of colors from a double image
Oh okay I totally misunderstood the question. Round 2: A = imread('patchchart.png'); patchmask = rgb2gray(A)>40; patchmask...

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how i can superpose (overlay) two images ?
You can use tools like imoverlay() or imfuse(), or you can combine the images by opacity blending. There are other ways "over...

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Connecting the dots in a binary image
It may be overkill for such a small image, but my answer to a previous question works well for largely convex closed paths like ...

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Graphic color that changes according to data
These are both similar examples: https://www.mathworks.com/matlabcentral/answers/1654235-how-to-change-color-of-graph-after-a-c...

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How to construct a N x N window that moves about an array (R) to calculate the number of a certain element in the window.
You'd just create a simple square array of ones. Consider the test array: R = zeros(9); R(1:2:end) = 1 % make a filter N = ...

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cutting a smaller potion of an image
Consider the following simplified matrix: A = [1 1 1 4 4 4 7 7 7;1 1 1 4 4 4 7 7 7;1 1 1 4 4 4 7 7 7; ... 2 2 2 5 5 5 8 8 ...

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Returning an array of colors from a double image
You can leverage rgb2ind()'s minimum variance quantization to get a best-fit color table of specified length. A = imread('https...

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when blur is a low frequency component, how does a motion blurred image spectrum possess high frequency?
This isn't going to be a technical explanation, but consider the following: I don't know where the source image came from, but ...

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is it possible to define only the sigma value in the edge command?
Bear in mind that even if you were able to specify the arguments out of order, edge() will assume a default threshold value. Th...

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How do I use a plus and minus in a variable
If we're simply working with numeric variables, something like this may work: B = 5 + [4 -4] Or in cases where the +/- term is...

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How to extract odd values and even values from a 500x500 black image ?
Consider the matrix: A = randi([10 99],5,5) % get elements from odd linear indices oddelems = A(1:2:numel(A)) % get elements...

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Create a specific matrix (MATLAB)
This is one way: A = flipud(toeplitz([4 3 2 1]))

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add space column to matrix
See if this is more along the lines of what you need A = [1 2 3;4 5 6] b = {'a' 'b' 'c' 'd'} Ac = split(sprintf('%G\n',A'))...

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How does the colon operator work in a 4d object?
Your goal isn't to affect the values of a particular dimension. There are no values "of a dimension" it's just the whole array....

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How to overlay a mask on an image with zero transperancy?
You can still use basic masking methods. Note that in this case, the images as supplied are both uint8. If your working images...

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How to draw a letter T ? the background is black and the letter itself white
FWIW, you can always just do A = ones(16,18); A([3:5 19 20 35 44 51:60 67:76 83 92 99 100 115:117 ... 150 166 180:187 195...

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