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How do I make a section of a function runs only one time?
One way might be to use persistent variables. function out = myfunction(a,b,c) persistent S data_mdl if isempty(S) ...

más de 4 años hace | 1

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The image changes color and position
I'm not sure why the image is upside-down, but the reason it's yellow is probably because it's a monochrome (single-channel) ima...

más de 4 años hace | 1

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different file name in saving images
In whatever loop you're using, create the filename something like this: k = 10 % whatever number you need sprintf('Y_%03dmm.bm...

más de 4 años hace | 0

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Transparency value in colormap
Colormaps and colorbars do not support RGBA formats (as far as I know). Transparency is handled separately by the AlphaData pro...

más de 4 años hace | 0

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Create a vector using the even elements of another.
If I understand the question correctly: b = 10; N = 100; j = 1:2:N+1; del_y = b/N; i = 1:1:N+1; y_pos = -(b/2) + (i - 1)...

más de 4 años hace | 0

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how to set decimal value to my matrix image index?
You have some problems with your code that's causing the result to not have the number of gray levels you expect. I think imsho...

más de 4 años hace | 0

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How to generate a map of European countries coloured according to a vector of positive and negative values?
This should work. Note that the placeholder data isn't even integer-valued. % country names cou_nam = {'Belgium', 'Bulgaria',...

más de 4 años hace | 1

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Plot conflicts with mathematical calculation
There are two poles. The function is undefined when the denominator is zero. The only reason it looks like the extrema vary is...

más de 4 años hace | 0

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Plot two figures simultaneously
You can try something like this. There's some lag in between figure updates, but it's a start. % Data Layup Layup = [90 0 0 4...

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how to find position of an element in a matrix which is present in another matrix?
a=[0.74 0.71 0.604 0.47 0.59 0.58 0.75]; b=[0.604 0.75]; % get the index of matches % ainb are the indices of elements of a...

más de 4 años hace | 0

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Creating a blur brush tool for images
Doing the interactive painting routine sounds like it's going to be laggy and frustrating. That's one of the things I've long...

más de 4 años hace | 0

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median filter on a region of interest
Just filter the whole image and then compose the two using a mask that defines the ROI. A = imread('cameraman.tif'); % make ...

más de 4 años hace | 0

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I am trying to plot multiple data sets on one one diagram. When I use the plot function, I am not getting any data plots.
p02p01 is a scalar, so there's not really anything to plot. I imagine that's supposed to be a vector, but you're just overwriti...

más de 4 años hace | 0

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Can someone please help me out with this MATLAB code. It is giving error "INDEX EXCEEDS THE NUMBER OF ARRAYS_ INDEX MUST NOT EXCEED 1" ON LINE 69
thetaa1t and thetaa2t are initialized as scalars thetaa1t((1)) = 0 ; thetaa2t((1)) = 0 ; I imagine you're trying to grow them...

más de 4 años hace | 0

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2 unknowns in matching datasets
I'm sure there are other ways, but: load datasett.mat % omit nans nanmask = ~(isnan(Y1) | isnan(Y2) | isnan(Y3)); Y1 = Y1(...

más de 4 años hace | 0

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How do I convert my RGB image to grayscale without using the Image Processing Toolbox?
EDIT: It's worth noting that as of R2014b, rgb2gray() no longer requires IPT. Still, if you're writing code for others and inte...

más de 4 años hace | 0

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Change RGB image to gray without rgb2gray function
Assuming that the input is an RGB image and that the intended grayscale representation is luma and not something else: % get an...

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i need negative image
It's best to avoid writing your code around unchecked assumptions of array class. If you have Image Processing Toolbox, imcompl...

más de 4 años hace | 1

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Rotate an Ellipsoid towards a point
Try this: theta = linspace(0, pi, 25); phi = linspace(0, 2*pi, 25) ; x = 10*sin(theta)'*cos(phi); y = 1*sin(theta)'*sin(phi)...

más de 4 años hace | 0

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Display original and processed image simultaneously in different UIAxes in App Designer
The images appear alternately because that's what the code plainly does. It shows one image, waits, shows another. It doesn't ...

más de 4 años hace | 0

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How can the image be like this?
This is one way: A = imread('peppers.png'); imshow(A) B = zeros(size(A),class(A)); % black image B(100:250,200:350,:) = A(10...

más de 4 años hace | 1

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Change for loop to while loop.
If you want to make things more complicated, you can: n = 5; %input ("Input a number: "); fprintf("\nOdd number: "); i = 1;...

más de 4 años hace | 0

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Creating a contour plot with three row vectors
I answered a similar question recently. https://www.mathworks.com/matlabcentral/answers/1693130-how-to-use-a-contour-between-...

más de 4 años hace | 2

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I'm trying to operate on each element of a row vector individually but unable to do so, as each element is containing a vector within itself.
I think what you're asking is to get the number of elements for each vector within the cell array. You can do that either with ...

más de 4 años hace | 0

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Check if a binary image is within a particular binary area
I'm assuming your images are the same size, but contain objects of differing size. The intersection of two binary images A and ...

más de 4 años hace | 1

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How do I draw overlapping circles wich change color?
Here's one way: % image setup sz = [600 600]; % image size cim = sz/2; % [y x] center of image r1 = 100; % radius of small c...

más de 4 años hace | 0

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Help on while loop to make user enter an accepted value
pC can't be <0 && >100 This should fix the issue and simplify things pC = -1; % initialize while (~isnumeric(pC) || (pC<...

más de 4 años hace | 1

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Code for making a reddish image from an RGB image
I've answered a couple very similar-sounding questions recently: How to make image "yellowish"? (explaining 'screen' blend, alt...

más de 4 años hace | 0

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Why is my plot empty?
The plot doesn't display because all of the output values (except for tt = 0) are NaN. L is a relatively large number ~2E6, s...

más de 4 años hace | 0

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How to "circularize" a 1-D plot into a 2-D image
Depending on what you need, this may be a start. % define TF curve tfr = [0 1.3 4]; tfz = [1 1 0.2]; % array setup maxxy = ...

más de 4 años hace | 0