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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

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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

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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

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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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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

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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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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