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
Getting an array of points along an arc
This is basically the same as this answer, but maybe the explanation helps a bit: https://www.mathworks.com/matlabcentral/answe...
1 day ago | 0
Question
Plots have defect when saved from axes context menu in R2019b
I ran across this issue when trying to answer a question for someone else: https://www.mathworks.com/matlabcentral/answers/8856...
2 days ago | 0 answers | 0
0
answersWriting 3D array to BMP file
imwrite() doesn't support multipage/multiframe BMP files, because (as far as I know), the format specification for BMP doesn't a...
2 days ago | 0
| accepted
Sudden error "Unidentified function or variable"
Did you read what the error message said? Unrecognized function or variable 'X'. Error in untitled (line 3) Z1 = zeros(1, len...
3 days ago | 0
| accepted
How can I mark points of the period length on stem of cos?
You're running into problems because your sampling rate means that your samples (other than the first one) don't neatly line up ...
3 days ago | 0
| accepted
how to define that function in matlab
I could bark out the boilerplate response for low-effort copypasted homework questions, but I'm out of breath today. Let's sett...
3 days ago | 0
I want to shorten a string.
You can use regexp() on either strings or chars. timestamp = 'Start=2021-06-11T:12:32:04:122'; out = regexp(timestamp,'(?<=:...
3 days ago | 0
extract the intersection of two matrices
I have a feeling that the range of data in B isn't what you think it is. Using the compositing method involving -1 is probably ...
5 days ago | 0
| accepted
Unable to display cropped image in the image axes properly
I'm not sure if you realize that you're starting an interactive imcrop() session. imshow(imcrop(M),'parent',handles.axes2); ...
5 days ago | 0
| accepted
How to construct a "ones" matrix with zero blocks in the diagonal
This display is going to get cut off, but this should serve as an example. A = ones(4); B = 1 - blkdiag(A,A,A,A)
5 days ago | 0
| accepted
circle problem, circumscribed to another circle and the area, area per image detection
This could be improved or elaborated, but it's a simple start: % let's assume that 1px = 1 square meter r = 400; C = rand(10,...
6 days ago | 0
| accepted
How to combine and rgb and a thermal image?
Let's just start with concatenation. We have two test images: an RGB visible image and a single-channel thermal image. How I m...
6 days ago | 0
| accepted
Chang a color in an image to black
Improving selectivity of the orange mask is really only half the battle; you'd need to also restrict the red mask to keep them ...
8 days ago | 0
| accepted
Error: Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 1-by-41.
It's unclear what your intentions are. If I assume you're trying to do this all elementwise WRT h, then you missed an index: p...
8 days ago | 0
How to display multiple ROI (masks) in different colors on one image?
I know this is probably too late to help, but consider this: fontSize = 16; Image = imread('Report_Picture.png'); [rows, colu...
9 days ago | 0
Help correcting the sequence function
% if you're asking the user for a number, use a clear description % "sequence matrix" doesn't tell anyone what the number mea...
9 days ago | 0
Contourf colorbar color range
If you want a discrete colormap with nonuniformly-spaced breakpoints, you're going to have to make one. You're probably using a...
9 days ago | 0
This the main file for hill cipher
uhh okay? f = 1; But if you really want my advice, asking the user to input a bunch of things one element at a time using in...
10 days ago | 0
Question
How to find one's own comments on File Exchange
I recall being able to see a list of my own comments and comments i've received on my FEX submissions. Given that FEX comments ...
10 days ago | 0 answers | 0
0
answersUnable to draw just the boundary of an image
Well, you're loading a grayscale image subject to destructive compression as a jpg file. At no point do you explicitly threshol...
10 days ago | 0
| accepted
Improve the speed of nested for loops through vectorization or similar methods
One big speed improvement you can do is to move the scalar multiplication of Dz outside the loop, but if you don't use a loop, i...
11 days ago | 1
| accepted
Solving for different thetas in an equation.
If you have a sufficient amount of information to describe the number of variables, then yes. If I make some assumptions: % as...
11 days ago | 0
Cell components perpendicular division
Something like: A = num2cell(reshape(1:16,[4 4])) % example array B = cellfun(@rdivide,A,circshift(A,[-1 -1])) % output To de...
11 days ago | 2
| accepted
How do I find the phase of any point in the graph below
Considering that there's only one boundary of interest, it's fairly simple. x=0:10:91; y=0.01*x.^2; xt=[30 70]; yt=[60 2...
11 days ago | 0
| accepted
contourf without isoline but with label
Set linecolor to 'flat' [C,h] = contourf(peaks(20),10); set(h,'LineColor','flat') clabel(C,h,'FontWeight','bold','FontSize',5...
12 days ago | 2
| accepted
Question
Inconsistent interpretation of tabs in the forum post editor
To preface, I don't even know if this problem can be replicated by others. Across various Firefox-based browsers, the post edit...
14 days ago | 0 answers | 1
0
answersI need to add a colorbar to an indexed image showing by imshow()
It seems to me that what you're trying to do is just scale the tick labels and not actually scale the mapping (which is what you...
14 days ago | 0
| accepted
how to send pcolor contour to back when updating contour z value?
If you have the handle of the object which represents the lines, you should be able to reorder the stack: uistack(lineplothandl...
14 days ago | 0
| accepted
How can I add text to an image and make the text become part of the image within MATLAB?
Doing display capture seems like a poor workaround. The suggested method will fail for any practically large images. A reduced...
14 days ago | 0
How do I multiples of a number in an array
Depends how far you want to go with it. You could leverage implicit array expansion to do it in a way that might make a more ge...
14 days ago | 0
| accepted
