Hello, please help me solve this problem in converting cwt.

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Muhammad Deeb 2021-11-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1577365-hello-please-help-me-solve-this-problem-in-converting-cwt

评论： DGM 2021-11-2

clc
clear
close all
%%
Fs = 1e3;
t = 0:1/Fs:2;
x = cos(2*pi*32*t).*(t>=0.1 & t<0.3) + exp(-t.^4).*sin(2*pi*64*t).*(t>=0.7 & t<1)+4*exp(-t).*sin(2*pi*20*t).*(t>=0.9);
plot(t,x,'color',[0 0 0])
xlabel('Time(s)')
ylabel('Function value')
fig = gcf;
set(0,'DefaultFigureWindowStyle','normal')
set(fig,'Position', [500 300 600 300]);
box on
ax = gca;
ax.LineWidth = 2;
ax.FontSize = 10;
ax.FontAngle = 'normal';
ax.FontWeight = 'Bold';
figure 
cwt(x,Fs)
fig = gcf;
set(0,'DefaultFigureWindowStyle','normal')
set(fig,'Position', [500 300 600 300]);
box on
ax = gca;
ax.LineWidth = 2;
ax.FontSize = 10;
ax.FontAngle = 'normal';
ax.FontWeight = 'Bold';
%%
figure ;
wgnNoise = .4*randn(size(t));
x1 = x + wgnNoise;
plot(t,x1,'color',[0 0 0])
xlabel('Time(s)')
ylabel('Function value')
fig = gcf;
set(0,'DefaultFigureWindowStyle','normal')
set(fig,'Position', [500 300 600 300]);
box on
ax = gca;
ax.LineWidth = 2;
ax.FontSize = 10;
ax.FontAngle = 'normal';
ax.FontWeight = 'Bold';
figure
cwt(x1,Fs)
fig = gcf;
set(0,'DefaultFigureWindowStyle','normal')
set(fig,'Position', [500 300 600 300]);
box on
ax = gca;
ax.LineWidth = 2;
ax.FontSize = 10;
ax.FontAngle = 'normal';
ax.FontWeight = 'Bold';

When executing the program I get the following error message:

Warning: Struct field assignment overwrites a value with class "double". See MATLAB R14SP2

Release Notes, Assigning Nonstructure Variables As Structures Displays Warning, for details.

> In mmm2 at 16

Error using cwt (line 145)

Not enough input arguments.

Error in mmm2 (line 21)

cwt(x,Fs)

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DGM 2021-11-2

在 MATLAB Online 中打开

I don't have WT, but this seems to run fine in-browser.

Fs = 1e3;

t = 0:1/Fs:2;

x = cos(2*pi*32*t).*(t>=0.1 & t<0.3) + exp(-t.^4).*sin(2*pi*64*t).*(t>=0.7 & t<1)+4*exp(-t).*sin(2*pi*20*t).*(t>=0.9);

% ...

cwt(x,Fs)

I see there is more than one version of cwt(), as it's changed across versions.

https://www.mathworks.com/help/wavelet/ref/cwtold.html

https://www.mathworks.com/help/wavelet/ref/cwt.html

If you're stuck with the older version, I'm guessing you'll have to figure out if you can use it for your purposes. The syntax and output differ, and the documentation is a bit sparse.

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