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Question

Inaccurate results when writing xls through writetable

Hello everyone. I am using Matlab R2021b. I write then save .xls files from a table using writetable. After saving, I write aga...

5 mois ago | 1 answer | 0

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answerFind the Averaged periodogram

You need to use Welch’s method for power spectral density estimation. Read the details here, and see the demo below. clc, clear...

10 mois ago | 0

How can applied FrFT of an ECG signal estimated as discrete fractional Fourier transform based on Eigen decomposition?

To compute the FrFT, you may use this contribution (I haven't tested myself). If you need the computation to be performed based ...

10 mois ago | 0

Hello guys, i need help for estimating FAR from this formula can review my code please

Have you noticed that the distributions defined in your codes are not Gaussian? See the demo below mu = 3; sigma = 1; x = mu-...

10 mois ago | 0

How to do a hankel transform on a matrix in Matlab?

The Hankel transform (HT) of a vector is a vector and of a matrix is, naturally, a matrix. You mentioned that in your applicatio...

10 mois ago | 0

Docked figures tabs postion from top to left in code?

f = figure; tg = uitabgroup(f, 'TabLocation', 'right'); tab1 = uitab(tg, 'Title', 'Figure 1'); tab2 = uitab(tg, 'Title', 'Fig...

10 mois ago | 1

| accepted

what does this Complex values are not supported mean?

tetagrados is a vector of complex numbers. So, first of all, notice that the function plot throws a warning and plots only the r...

environ un an ago | 0

| accepted

How do I sort files by part of their filename?

You can use the following to search for files in the current folder that have a specific name format: P = dir('*I=0.5') % P = ...

environ un an ago | 0

Invert a histogram by emphasizing on the valleys

One way to do that probably is by subtracting the rate in each bin from the maximum rate. Below is an example with normal distri...

environ un an ago | 1

| accepted

How to denoise chirp signal in low SNR condition with NLMS or any other methods?

As I mentioned in my comments to your question, it is recommended that you experiment with some state-of-the-art time-frequency ...

environ un an ago | 1

| accepted

How to find the maximum of peaks ?

Below, I am proposing an implementation of what I understood to be your task. You have to experiment with the findpeaks multiple...

environ un an ago | 0

| accepted

Making a matrix of R*C size that takes the values randomly from an array- Y.

i1 = 7; i2 = 8; y = [1 6 1 8 4 5]; randIdx = randi(length(y), 1, i1*i2); data = reshape(y(randIdx), i1, i2)

environ un an ago | 1

How can I interpolate rows in an array with a loop?

if A is an array, then Matlab will throw an error, as you are using curly braces for indexing. Below is a demo on how to user ...

environ un an ago | 0

maxk from subset of array

clc, clear v = [10,22,3,-5,8,6,100,30,12,9]; subIdx = [1,3,5,8]; k = 2; % sort values and get corresponding indices [v...

environ un an ago | 0

| accepted

How to remove empty line from struct?

D.f1 = [1 2 3 4 5]; D.f2 = []; % structure with 2 fields D % get fields fields = fieldnames(D) % remove empty fields...

environ un an ago | 0

Count the number of times a word appears?

A = {'fishX', 'fishY', 'fishZ', 'fishX', 'fishX'}'; B = [3 3 2 2 2]'; T = table(A, B); groupsummary(T, "A", 'sum')

environ un an ago | 1

how to recognize if an element of a cell array is a char vector

c = {'name', 'John Smith'; 'age', 32; 'children', cell(1,2)} cellfun(@ischar, c)

environ un an ago | 0

| accepted

Creating a mesh in a 3-d plot.

clc, clear, close all opts = detectImportOptions('Data1.xlsx'); opts1 = detectImportOptions('Data2.xlsx'); % Load data ...

environ un an ago | 0

| accepted

Linear interpolation two array with target value in one array

Try this clc, clear A = [483, 427, 306, 195]; B = [0, 0.25, 0.5, 0.75]; % assume that these are your target values targ...

environ un an ago | 0

I need help with converting hourly data to daily summation inside a cell

Note that the data type in the column date is char, not datetime. Try the following: clc, clear load('example.mat'); data...

environ un an ago | 1

| accepted

Struggling to create STFT form FFT

There are several open-source Matlab-based time-frequency toolboxes, which all provide implementations of the STFT. Check some o...

environ un an ago | 0

| accepted

Please help: ' Dimensions of arrays being concatenated are not consistent'

clc, clear d = load('Data.mat'); idx_lheel_start = find(strcmp(d.data_raw2(:, 2), '"Left Heel"')); idx_lheel_end = find(s...

environ un an ago | 0

| accepted

Finding Impulse response of LTI system when input signal and output are given.

Below is a code that estimates the impulse response with 3 equivalent approaches: clc, clear inpSig = [1 1 1]; outSig = [...

environ un an ago | 2

How to add a new array in the structure?

clc, clear vehicle.genset_model.drag = [4; 5; 6; 7; 8; 9; 10]; % save structure array in 'data.mat' save('data.mat', 'veh...

environ un an ago | 0

| accepted

Time resolution of Spectral Entropy - How could I modify it?

You need to provide the spectrogram to the Matlab function, and this spectrogram should have your desired time resolution. See ...

environ un an ago | 1

| accepted

FFT of quantized signal

There are some issues with your code. See my modifications and comments below. You cannot calculate SNR, because you did not add...

environ un an ago | 0

Comparing Audio Impulse Responses

More generally, I believe you're looking for a quantitative measure of similarity between functions. This is a large domain of r...

environ un an ago | 0

How to tell/check existing categories in tall tables

Yes, there is a way. Use findgroups.

environ un an ago | 0

| accepted

Replace NaN with median per column

clc, clear x1 = randn(5, 5); x1(randi(numel(x1), 1, 5)) = nan; x2 = fillmissing(x1, 'movmedian', size(x1,1)*2, 1); display...

environ un an ago | 1