DGM
Hi, I'm nobody.
I don't belong here, but I have nothing better to do.
Matlab used to be part of my work.
Now it's part of my hobbies.
That's pretty sad, really.
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Content Feed
How do I save the coordinates that I find freehand
An example: % generate some example test images % you don't need to do any of this inpict = repmat(double(imread('cameraman.t...
4 hours ago | 0
How can I extract the data from this jpeg file. Any suggestion ?
Depending on what your expectations are, the answer is one of the following: You can't get what you want. You can, but you won...
5 hours ago | 0
how to store values from loop in vector
Not knowing what exactly you're doing, it's hard to give an exact or potentially simplified answer, but here's an example. p = ...
6 hours ago | 0
To read a word and indices
Something like this should be a start. fid = fopen('test.txt'); while true linx = fgetl(fid); if ~ischar(linx); br...
22 hours ago | 1
Why does my code only print straight lines?
Not sure it's exactly how you want it, but there's this. I put them in subplots just for the sake of clarity. You don't need t...
2 days ago | 0
Graphing time vs velocity
This is a starting point: % some test parameters a1 = 1; % Train acceleration (m/s^2) a2 = 1; % Train decceleration (m/s^2) ...
2 days ago | 0
Cross section or profile at an angle from [X, Y Data]
Consider: % generate test points in a 3-col format as described [xx yy zz] = peaks(100); rmask = (xx.^2 + yy.^2) <= 2.5^2; X...
2 days ago | 0
How to save the required output?
Something like this: %Select image folder A A_dir = uigetdir(); %Select image folder B B_dir = uigetdir(); %Identify file...
4 days ago | 1
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Unable to convert grayscale images into rgb from a folder.
imwrite() needs numeric/logical data as its primary input. You're feeding it a 3D char array of file paths. Read the file, con...
4 days ago | 0
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Running a forloop to add text in the black pixels only!
Consider: Str = fileread('adapthisteq.m'); % using this in place of a custom text file x = im2uint8(imread('circles.png')); %...
4 days ago | 0
Construct a 5 x 10 array that contains zeros. Assign elements at (row, column) (3,5), (2,4) and (1, 9) values of 44. Display the matrix.
Consider an altered example: In a 3x5 array, assign a fixed value to elements (3,3), (2,5), and (1,1) sz = [3 5]; % array size...
9 days ago | 0
Techniques for blending images that have overlap
This is a simple approach to doing edge-interpolation. This could also be done using interpolation tools in fewer lines, but ri...
10 days ago | 0
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No data points appear on the graph when I hit run
When you plot points one at a time, they are rendered as single unconnected points. Since there is no specified marker type, th...
12 days ago | 0
Changing the limit of for loop give different result
Without knowing where fim comes from, I don't know. I'm going to guess that fim is another image imported the same way as the g...
12 days ago | 0
Never ending while-loop
There are a few problems. LW(1) will never match variabel, since they're different lengths. The first 3 characters of LW will ...
14 days ago | 0
| accepted
I am trying to use the "findpeaks" function to find the peak in a set of data.
The documentation for findpeaks explains it better than I could: "The prominence of a peak measures how much the peak stands ou...
14 days ago | 0
why my matlab didn't plot anything?
Start with something like this: m = 85; g = 9.81; ti0 = 0; tf1 = 9; v0 = -20; h = 1; c1 = 11; dv1 = @(g,c1,v,m) g-c1*v/m...
14 days ago | 1
New matrix with only the negative numbers of another one
A = [-1 ; -2 ; 6 ; -4 ; 5 ; 10; -22; 4]; B = A(A<0)
14 days ago | 0
| accepted
How to update title of plot without it "wiggling"
The issue isn't with getting the right number of characters. It's an issue of character spacing. plot(rand(1,10),rand(1,10))...
15 days ago | 0
Find equal pentagonal and square number
This is a rather brute force method, but it still only takes 1.5ms to find the third match on my dumpster PC. n = 1:10000; p...
15 days ago | 2
Audio to Image Conversion
What are n and m? Is either greater than 65500? Should it be? I don't know if using factor() this way is really doing what y...
16 days ago | 0
| accepted
Rescale 8-bit grayscale image
Here's a start: inpict = imread('cameraman.tif'); inrange = [64 126; 127 230]; outrange = [0 120; 151 255]; % you sure you ...
17 days ago | 1
Create a surface from several 1D plots
Something like this: % so you have a vector for x x = linspace(0,1,10); % and a bunch of vectors for z z1 = x.^1; z2 = x.^2...
17 days ago | 0
| accepted
Applying a circular mask to an image
There are other posts about how to composite two images (or an image and a flat BG) https://www.mathworks.com/matlabcentral/ans...
18 days ago | 0
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Given a matrix of n rows and 2 columns containing the xOy coordinates of n points. Find two points with distance and return the row index of those two points
Consider: n = 10; % number of points d = 7; % distance to match P = 10*rand(n,2); % example point list D = sqrt((P(:,1)-...
18 days ago | 0
Why didn't I find the same answer?
b and B are not the same. They are conjugate. B=-(-1)^(alpha-1)*(1/s^2)^(alpha); In this case (alpha-1) does not equal 0.7. ...
19 days ago | 0
| accepted
Index in position 2 exceeds array bounds (must not exceed 1) ?
Nothing in this code guarantees that the size of b and c are identical to the size of a. If they aren't the same size, you will...
19 days ago | 0
How to fix "error using class. Not enough input arguments"?
You had probably shadowed the function class() with some variable by the same name -- which is something you should avoid. wh...
19 days ago | 0
How do I insert a variable value in legend of a plot?
There are a bunch of examples around. The sidebar shows some. Here are some others: https://www.mathworks.com/matlabcentral/a...
19 days ago | 0
How to apply Gaussian filter with for loop without imnoise?
Replicating the gaussian noise functionality of imnoise() does not require any loops. If someone insists that you need to use l...
20 days ago | 0
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