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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...

3 months 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...

8 months 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 ...

8 months 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-...

8 months 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...

8 months 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...

8 months 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...

12 months 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 = ...

12 months 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...

12 months 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 ...

12 months 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...

12 months 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)

12 months 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 ...

12 months 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...

12 months 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...

12 months 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')

12 months 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)

12 months ago | 0

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Creating a mesh in a 3-d plot.

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

12 months 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...

12 months 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...

12 months 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...

12 months 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...

12 months 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 = [...

12 months 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...

12 months 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 ...

12 months 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...

12 months 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...

12 months ago | 0

How to tell/check existing categories in tall tables

Yes, there is a way. Use findgroups.

12 months 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...

12 months ago | 1