# Lucrezia Cester

Last seen: 12 mois il y a Actif depuis 2019

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Question

how to plot higher order levels of the wavelet scattering transform?
As the title says, how to I visualize with a scalogram the different outputs of the scattering transform? In the same way that i...

presque 2 ans il y a | 1 réponse | 0

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Question

How many wavelets are there per filterbank?
Hello, Does anyone know how many wavelets there are per filterbank? For example, if the quality factor is 8, how many wavelets ...

environ 3 ans il y a | 1 réponse | 0

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Question

What is the scattering coefficient matrix returning when using the function FEATUREMATRIX?
smat = featureMatrix(sf,x) [smat,u] = featureMatrix(sf,x) smat = featureMatrix(___,Name,Value) I thought smat were the ...

plus de 3 ans il y a | 1 réponse | 0

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Question

how to divide matrix using mat2cell
Hello, I have a 9 matrices of size 1x21996, how can I divide the 9 matrices to be 6 of 1x3666 each? I tried this but it...

plus de 3 ans il y a | 1 réponse | 0

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Question

how to save iterations obtained from mat2cell?
I have a cell array A made up of matrices that I want to split up so I do this loop for i = 1:numel(A) B= mat2cell( A{i},[1]...

plus de 3 ans il y a | 1 réponse | 0

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Question

how to work with variables with different names in a loop?
Hello, I have a bunch of data taken in the lab which has names such as A1,A2... AN ... ETC. How can I work with these data...

plus de 3 ans il y a | 1 réponse | 0

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Question

how to partition data into testing and training
Hello, I am trying to train a ML network. I am using a matlab function which partitions my data into training and testing set...

plus de 3 ans il y a | 1 réponse | 0

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Question

how does the frequency change when you take the details coefficients of the wavelet transform?
Hello, I am using the wavelet decomposition to get the details coefficients of my signal. From my understanding, if I had...

plus de 3 ans il y a | 1 réponse | 0

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Question

what's the difference bewteen the scatternign tarsnform and cwt function?
Aren't both funxtions supposed to give you the continuos wavelet transform coefficients? What's the difference between these ...

plus de 3 ans il y a | 1 réponse | 0

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Question

why are the scalogram coefficients given in a table rather than matrix?
Hello, I am trying to get the scalogram coefficients from U, filterbank 2. s = scatteringTransform(sf,x) [s,u] = scatteringTr...

plus de 3 ans il y a | 1 réponse | 0

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Question

how to interpret scalogram coefficients
Hello, Once I obtain the scalogram coefficients and can make an image of them with this code. [S,U] = scatteringTransform(...

plus de 3 ans il y a | 1 réponse | 0

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Question

What is the difference between input of cell array {[Hi]} and {'Hi'}
As the title says, I have a cell array which contains data in this format {[Hi]} but I want to turn it to {'Hi'} ...

presque 4 ans il y a | 1 réponse | 0

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Question

How can I add zeros between elements of a matrix?
I have a vector [1,2,3]; and I want to obtain [1,0,2,0,3,0]; How can this be achieved?

presque 4 ans il y a | 2 réponses | 0

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Question

What is the difference between scalogram and scatteing coeffcients??
figure scattergram(sf,U,'FilterBank',1) What's the difference between scalogram and scatterinf coefficients ? Also, w...

presque 4 ans il y a | 1 réponse | 0

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Question

how to get coefficients out of scattergram?
Hello, I have input a 1d signal on amplitude versus time of an ECG signal as y in the below code Fs = 12000; sf = waveletS...

presque 4 ans il y a | 1 réponse | 0

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Question

How to align two noise signals with different phases?
Hello, I have the two signals as shown below. These two signals are sound signal and they carry the same information, however...

environ 4 ans il y a | 1 réponse | 0

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Question

Fourier Transform spatial resolution
Hello, I have a gaussian fucntion whose output image is shown below. Each index in this figure is supposed to be = 1 cm. ...

environ 4 ans il y a | 1 réponse | 0

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Question

Fresnel diffraction at an angle
I have written a code for Fresnel diffraction. [M,N]=size(gaussian); %get input field array size L=8000; z=10000; dx=L/M;...

environ 4 ans il y a | 1 réponse | 0

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Question

Fraunhofer diffraction of circular aperture
Hello, I am trying to see how a speckle pattern changes with distance after it scatters from a rough surface. I am using Fraun...

environ 4 ans il y a | 1 réponse | 0

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Question

Finding a value from spectogram
I created this spectogram through a vector of amplitudes. How can I find the max(:) Power/Frequency of this graph if I wasn'...

plus de 4 ans il y a | 1 réponse | 0

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Question

saving matrices with different cell sizes
Hello, I am running a for loop whose output is a matrix of different size at each iteration for c =1:1001 speckle_change...

plus de 4 ans il y a | 1 réponse | 0

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Question

Fraunhofer diffraction simulation in matlab
Hello, I have simulated how light would diffract by going through a phase mask. Below is the code. lambda=0.6*10^-6; % wavele...

plus de 4 ans il y a | 1 réponse | 0

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Question

Fraunhofer diffraction through scattering media
close all; clear all; lambda=0.6*10^-6; % wavelength, unit:m delta=80*lambda; % sampling period,unit:m z=1; % propagation dis...

plus de 4 ans il y a | 1 réponse | 0

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Question

how to change a .txt file to a .mat file
Hello, I have a .txt file that I want to convert into a .mat file. I tried this code M = dlmread('test_background_id.txt...

plus de 4 ans il y a | 1 réponse | 0

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Question

system of non linear functions
Hello, I get an error saying not enough input arguments. I literally tried to go step by step from the matlab tutorial for n...

plus de 4 ans il y a | 1 réponse | 0

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Question

Finding max value and its position in ed matrix
Hello, I know this question has alreayd been asked a million times, yet I have not managed to solve it by looking at previous...

plus de 4 ans il y a | 1 réponse | 0

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Question

tresholding by summing over a dimension of a matrix
Hello, I am trying to treshold data by summing over elemtns in the third dimension of a matrix and if the sum of all elements...

plus de 4 ans il y a | 1 réponse | 0

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Question

summing along 3rd dimension every 10 frames
Hello, I have a matrix of 32x32x2500. I would like to sum it along the third dimension so to have a matrix of 32x32x250 so tha...

plus de 4 ans il y a | 3 réponses | 0

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