Undefined function 'cwt' for input arguments of type 'double'.

I am currently conducting a CWT for my rail roughness. However, the errors keep showing "Undefined function 'cwt' for input arguments of type 'double'." Not sure if it is due to the input arguements for my roughamplitude? Any possible advice for cwt.

Below is my sample code

d2spectogram=xlsread('Nel20190802_MEAS35_displacement_results.xlsx');

dist=d2spectogram(:,4);

rough=d2spectogram(:,2);

rows = numel(dist);

sampdist = abs ((dist(rows) - dist(1)))/(rows-1);

totallength = dist(rows) -dist(1);

ylabel ('Roughness (um)');

xlabel ('Distance (m)');

windowsize=512;

window = hann(windowsize);

%window

nfft=2^nextpow2(windowsize); %size of the fft %hsv

noverlap=nfft*0.5; % 50% set for number of overlaps

fs_samp=1/0.001; %i have my sampling frequency

roughamplitude = rough - mean(rough); %focus on fluctuation

%continuous wavelet transform

%CWT of partial signal

[cwtW,cwtF]=cwt(roughamplitude,'amor',fs_samp);%morlet wavelength

cwtW_mag=abs(CwtW); %magnitutde cwt

cwtW_pow=cwtW_mag.^2;

figure

surf(t,cwtF,cwtW_mag,'EdgeColor','none');

colormap(jet);axis tight;view(0,90);

h=colorbar;ylabel(h,'Magnitude');

title('Wavelet transform of amplitutde signal');

xlabel('Time (s)'); ylabel('Frequency (Hz)');

surf(t,cwtF,cwtW_mag,'EdgeColor','none');

colormap(jet);axis tight;view(0,90);

h=colorbar;ylabel(h,'Magnitude');

title('Scalogram of amplitutde signal');

xlabel('Distance'); ylabel('Frequency (Hz)');

[Star Strider]

The cwt function is part of the Wavelet Toolbox. Yoou have to have the Toolbox installed to use the function.

To see if you have it, type:

ver 'wavelet'

in a script or in your Command Window. If you have it, among other items, you should see something similar to:

Wavelet Toolbox                                       Version 5.3         (R2019b)

in your Command Window as output.

[Victor Lee]

how do i go about installing the toolbox. seems like i do not have it.

"Warning: No properly formatted Contents.m file was found"

for 'wavelet'.

[Star Strider]

That depends on the environment you are working in. If you are in a university, contact your license administrator. If you have an individual license, you will have to purchase it. Contact MathWorks Sales for more information.