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# Yazan

Last seen: 2 months ago Active since 2020

Matlabist

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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...

3 months ago | 0

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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 = ...

3 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...

4 months ago | 1

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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 ...

4 months ago | 1

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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...

4 months ago | 0

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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)

4 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 ...

4 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...

4 months ago | 0

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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...

4 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')

4 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)

4 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 ...

4 months ago | 0

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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...

4 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...

4 months ago | 1

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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...

4 months ago | 0

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

4 months ago | 0

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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 = [...

4 months ago | 1

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...

4 months ago | 0

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create all logic permutation array
d = (1:2.^3-1)'; b = de2bi(d); b

4 months ago | 0

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 ...

4 months ago | 1

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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...

4 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...

4 months ago | 0

How to tell/check existing categories in tall tables
Yes, there is a way. Use findgroups.

4 months ago | 0

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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...

4 months ago | 1

x(t) = A sin(w0t + Ø) exp(-at)
clc, clear % sampling frequency fs = 1; % sampling period Ts = 1/fs; % sinusoidal frequency f0 = 0.01*fs; % Hz w0 =...

4 months ago | 0

Insert new row with values in a table before specific values
WP1 = [0 145 169 1693 1708 2729 0 48]; WP2 = [145 169 1693 1708 2729 2779 48 1382]; WC = [0 1 1 1 1 0 0 1]; dat = [WP1', WP...

4 months ago | 0

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How to split table cell into two columns based on data type?
Below is an example with toy data showing what you need to do. clc, clear, T1 = [1;2]; T2 = {'Y12'; 'Y2'}; T3 = {'H12'; 'H0'}...

4 months ago | 0

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How to generate a periodic customized waveform?
This simple function can compute the signal you need. Use lambda to control the decay and see the other parameters. function x...

4 months ago | 0

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How to plot ifft for a frequency signal?
clc, close all fs = 32768; fidx = z.Date23122013; specOneSide = z.Time100351; [fidx, idx] = unique(fidx); specOneSide =...

4 months ago | 0

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