Answered
Find a random position in a vector where the value is zero
% test data (includes zeros and imaginary numbers) A = [1i 4/1j 7 0 99 0 0 0 8*1j 0 0 0 8 9 0 -7 0]; % find indices of zeros...

3 years ago | 2

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Answered
Area under the curve ignoring axis values (Absolute area)
@Ganesh Naik Here's a new answer that uses ginput to "select" data points along the line for definiing the area of interest. Y...

3 years ago | 0

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How can extract data in scatter plot??
% test data x = rand(1, 100); y = rand(1, 100); % find elements for class 1 (x is between 0 and 0.1) idx = find(x >= 0 & x...

3 years ago | 0

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Answered
Area under the curve ignoring axis values (Absolute area)
The trapz function uses integration so the result is the area under the curve. That's not what you want. I suggest you first c...

3 years ago | 0

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Answered
How to search closest coordinate values in a Lat Long Z data
You can do this with the pdist2 function. For latitude and longitude, usually the haversine method is used. Google it if you w...

3 years ago | 0

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Using writetable in a for loop to create new txt/csv files for each step
Under the assumption your code is working fine except for the filename issue, here's what I suggest. Use this to create a new f...

3 years ago | 0

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Question

Problem using ranova for analysis of variance
I'm trying to use ranova to analyse data from a fairly simple experiment, but am not successful as yet. The data (60x3) are att...

3 years ago | 1 answer | 0

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sorting a matrix of 4 rows by the fourth element and outputting of combinations that make the 4th row element
At the end of your code, add sortrows(combs,4)

3 years ago | 0

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How do I center my time-history plot at zero using code
Is the offset you are subtracting the mean of the values in the corresponding arrays? If so, just subtract the means: plot(t,x...

3 years ago | 0

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Answered
Find values in 3D matrix with given indices
Unless I'm missing something, this is just a simple matter of finding the indices corresponding to the latitude 77:81 elements a...

3 years ago | 0

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Answered
Number of registered results by the number of total experiments in a pie chart
Here's one way to make the labels you want: % test data hEQ = [5 1 1 1 1 1]; % create labels for pie chart total = sum(hEQ...

3 years ago | 1

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Answered
How can I add confidence bounds to the plot?
Seems you are working with a linear model. Also, your attached plot is quite cluttered. It will get worse if you add confide...

3 years ago | 1

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Answered
Filter table based on time and make calculation
You don't need a loop. At a high level, here's what you need to do. Read the data into MATLAB, probably into a table using the...

3 years ago | 1

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Answered
Arrange the matrix by replace a part to another part
Assuming your matrices are conveniently sized... A1=ones(12); A2=ones(9)*2; A3=ones(6)*3; A4=ones(3)*4; A = A1; A(4:end,...

3 years ago | 0

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Answered
How to highlight a portion of time series on a plot?
Here's what I put together. I'm assuming you want 64 separate plots. % test data (timeseries) nRow = 64; % adjust as per yo...

3 years ago | 0

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Answered
Easiest way to load structure array from a text file
To save the data in the structure C in a file... save('savedata.mat', 'C'); To retrieve the data as a structure C later... lo...

3 years ago | 0

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read 2 digits in a txt file using %f
If you examine the documentation for fscanf, it states that the correct formatSpec to use when reading floating-point numbers is...

3 years ago | 0

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How to end loop after key is press
Here's an arrangement I've used with good success in the past. The loop executes indefinitely until a key is pressed. f = fi...

3 years ago | 1

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Answered
How to find the noisy signal using fourier transform for this data?
Here's what I put together. The input signal is somewhat noisy, but it is also periodic @ 34.4 Hz. f = 'https://www.mathworks...

3 years ago | 0

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Save number of iterations in a for loop
@Rajvi AmleThis script shows one approach to plotting the results of your simulations. The data loaded are the t and x data col...

3 years ago | 0

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how can i plot the amplitude spectrum of these signals
Do you want the FFT of the combination of the 20 Hz and 50 Hz signals? If so, then this might be the sort of plot you are after...

3 years ago | 0

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How to remove NaN from 2 column vectors?
X = [2 4 8 NaN 13 NaN 3 6 NaN 38 40 11]; Y = [NaN NaN 2 NaN 10 67 1 NaN NaN 19 26 NaN]; nanLogical = isnan(X) | isnan(Y); X(n...

3 years ago | 0

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Answered
start to write for a specified location using fprintf
Here's a solution. Make sure you use "r+" when opening the file, otherwise you'll overwrite the first line. fid = fopen('testd...

3 years ago | 0

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Answered
start to write for a specified location using fprintf
fid = fopen('testdata.txt', 'w'); % change, as needed fprintf(fid, ' result_1 result_2\n'); fprintf(fi...

3 years ago | 0

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Removing top and bottom outliers
Yes, the rmoutliers function will do the trick. After removing the top and bottom 5% of the values, the vectors below are reduc...

3 years ago | 0

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Answered
Split a target date interval into seasons and find the percentile of days for each season
There might be a way to shorten this, but I think it achieves what you are after. You didn't mention the year, so I set this up...

3 years ago | 0

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Answered
Plot of 3D colour scatter graph
I think this is more or less what you're after: f = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/679873/poin...

3 years ago | 0

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Answered
Plot 2D vector field
The reason you aren't seeing any vertical component in the quiver arrows is that the data in the V argument (wi) are very small ...

3 years ago | 0

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How to index the values of an array using a series of rows, column indices?
If you want to pull those three values from A and concatenate them, as in your output, then just retrieve the three elements usi...

3 years ago | 0

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repeat rows and export to txt file
I think this is more or less what you're after: % test data (read from file) A = [1 8;2 7;3 6;4 5] x = 3; % number of times t...

3 years ago | 1