Answered
Array indices must be positive integers or logical values. Error in sym/subsref (line 870)
A thorough discussion of the error is in the FAQ: https://matlab.fandom.com/wiki/FAQ#.22Subscript_indices_must_either_be_real_p...

3 days ago | 0

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Need to get a figure
hFig1 = figure; % Create first figure. hFig2 = figure; % Create second figure. figure(hFig1); % Switch to first figure. % Do ...

4 days ago | 0

Answered
finding roots of equation in matlab
Use roots: r = roots([a, 0, b, 0, c, 0, d]) Try this: % A=a*w^6+b*w^4+c*w^2+d; a = 0.0011 b = 2 c = 3 d = -5000; w = lin...

4 days ago | 0

Answered
Trying to save the red positions of an image
Oliver, this works: rgbImage = imread('image.png'); subplot(1, 2, 1); imshow(rgbImage); impixelinfo; % Let's you mouse aroun...

4 days ago | 0

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Answered
How to prevent decrement (melting) past 0 until growth increases again?
Another way, inside the loop, is to use the max() function: hsnow(day+1) = max([0, hsnow(day) + snowfall(day) + dh_snow]); h_i...

4 days ago | 0

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Answered
How to make binary file for each iteration in a loop?
Try this: baseFileName = sprintf('ax_%d_%d_%d.raw', k, j, i); fullFileName = fullfile(folder, baseFileName); % folder can be p...

5 days ago | 0

Answered
Radium decomposes at a rate proportional to the amount present. If a quarter of the original amount disappears after 900 years, what is the percentage lost in 75 years?
Did you see the File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/69106-radioactive-decay-bateman-equation?s_t...

5 days ago | 0

Answered
How to avoid patch color being included in legend ?
Try this: clc; clear all; close all; x = linspace(-10,10,200); y = sin(4*x); y1 = sin(x); figure; hold on patch([2 5 5...

5 days ago | 0

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Answered
make vectors same length
Maybe this: lastRow = min([length(acc), length(gyr), length(mag)]) % Crop acc = acc(1 : lastRow); gyr = gyr(1 : lastRow); m...

5 days ago | 1

Answered
writetable adds unnecessary columns to Excel file
I see no such extra columns. Are you sure they're not still existing from a prior run where you forgot to transpose the variabl...

5 days ago | 0

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Answered
Sampling of a sinusoidal signal.
Here's a start: clc; % Clear the command window. fprintf('Beginning to run %s.m.\n', mfilename); close all; % Close all f...

5 days ago | 0

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Converting my code to matlab
You don't need to declare the type of a variable in advance (uint8, int, etc.) Opening braces are not needed to start a loop an...

5 days ago | 0

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how to inverse the output image to show image like sketch
To invert the image subtract from 1: FMag = 1 - FMag;

5 days ago | 0

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Join curves of an image, identify which curves have to be joined
I'm attaching two edge linking demos. Adapt as needed - sorry I can't do that for you (not enough time).

6 days ago | 0

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Deblurring an Image using inverse filtering
You have to do the division in Fourier space. You're doing it in the spatial domain, AFTER you've converted your image back to ...

6 days ago | 1

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fill rectangles with colors
Try this: numRects = 20; positions = rand(numRects, 4); % Positions = [x, y, width, height] % this way you will have more con...

6 days ago | 1

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fill rectangles with colors
Did you try the rectangle() function? It has options for 'FaceColor', and 'EdgeColor'.

7 days ago | 1

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Represent data as image using color amplitude and hue
You could try something like this: Sounds like 3-D data to me. Or even two separate 2-D images. So try [rows, columns, numCo...

7 days ago | 0

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Just want to learn how to better
Here's your answer : Mathworks blog on covid-19 xrays

8 days ago | 0

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Answered
how to input to "imread" using uint8 vector that is equivalent to binary data of image file from fread
Of course imread() will "recognize" the image file on disk as a uint8 jpg image if you got it written out properly. I don't kno...

8 days ago | 0

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growing bubbles with a predetermined radius in a given volume?
Try the tag link on the right for "circle packing".

8 days ago | 0

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Divided interest of space (ROI) into continuous cubes
Description example labels = segmentLidarData(ptCloud,distThreshold) segments organized 3-D range data ptCloud into clusters. ...

9 days ago | 0

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How can one extract this vector from a matrix?
Try splitapply(): % Get sample data: M = rand(60, 3); M(:, 1) = repmat([1:12]', 5, 1) % Make months repeating in the first co...

9 days ago | 1

Answered
How to save a figure through each run of a for loop?
Try export_fig: http://blogs.mathworks.com/pick/2010/05/28/creating-and-exporting-publication-quality-graphics/

9 days ago | 0

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How to save a figure through each run of a for loop?
If you have r2020a or later, try exportgraphics().

10 days ago | 0

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Creating one histogram for a multiple DICOM images
See the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F In the loop, simply add the counts fro...

10 days ago | 0

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Answered
How can i save the scatter in GUI?
If you have r2020a, use exportgraphics().

10 days ago | 0

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How to define 1000*1000 matrix in matlab? Whenever I want to define a matrix 1000*1000, out of memory message was shown. Can anyone please help me?
Try this to get a 1000-by-1000 matrix rows = 1000; columns = 1000; A = zeros(rows, columns);

10 days ago | 0

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dE values in an image search
Code for that is in the demo in my File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/31118-color-segmentation-...

10 days ago | 0

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Answered
Make a standalone app
Yes, you need the compiler toolbox. See the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_make_a_standalone_executable_from...

10 days ago | 2

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