Does anyone know why this script isnt working?

               clc;clear;close all;
                N=10;
                s0=[-pi:2*pi/N:pi];
                s=s0(randperm(N));                %Performs a random permutation of the integers
                from 1 to N
                x=.5+asin(sin(1*s))/pi;         
                [dummy,index]=sort(s);               % orders the elements of s in ascending order
                Y=model(x);
                yr=y(index);
                spectrum=(abs(fft(yr))).^2/N;         % fft is the fast Fourier transform
                V1=2*sum(spectrum(2:M+1));             
                V=sum(spectrum(2:N));
                S1=V1/V;

[Siamak Seyedzadeh]

This code has been written for sensivity analysis based on Variance Method.

Answer 1

[Walter Roberson]

                from 1 to N

from() is a Java Date method that does not expect character vectors '1', 'to', 'and 'N' as inputs.

Perhaps you wanted to code a for loop, but it is not obvious to me what you would be looping over.

[Siamak Seyedzadeh]

Dear Walter

Thanks for your reply. This code has been quoted in the book "Global Sensitivity Analysis The Primer" by Andrea Saltelli and et al.

[Walter Roberson]

               clc;clear;close all;
                N=10;
                s0=[-pi:2*pi/N:pi];
                s=s0(randperm(N));                %Performs a random permutation of the integers from 1 to N
                x=.5+asin(sin(1*s))/pi;         
                [dummy,index]=sort(s);               % orders the elements of s in ascending order
                Y=model(x);
                yr=y(index);
                spectrum=(abs(fft(yr))).^2/N;         % fft is the fast Fourier transform
                V1=2*sum(spectrum(2:M+1));             
                V=sum(spectrum(2:N));
                S1=V1/V;

However this needs a function named model() that is not part of MATLAB or any toolboxes that I can see.