Need help in trying to find abs(W)

%A nonstationary physiological signal given in sr.txt.

%first column is the time in seconds

%second column is the physilogical signal

%This signal is sampled at a nonuniform rate that resulted in

%different sampling interval as the data is being collected.

%Develop an algorithmto determine the power spectral density

%%

clearvars;

close all;

clc;

load sr.txt;

time=sr(:,1)-sr(1,1);

sig=sr(:,2);

fs=10;

timeI=[[0:1:length(sig)-1]*(1/fs)];

sigI=interp1(time,sig,timeI);

[W,f]=cwt(sigI,'amor',fs);

%Find the average of W

%x-axis frequency

%y-axis power

A=[abs(W)];

M=mean(A)

figure(1)

plot(M,sigI);

hold on;

plot(timeI,sigI,'r')

xlabel('frequency');

%ylabel('power spectrum')