Unable to use a value of type 'cell' as an index

Hello,

In my code, I receive the error "Unable to use a value of type 'cell' as an index". Looks like it has a problem iregarding the plot line so, I tried to rename r and x but it did not work..

I'll be glad if you could help.

Ny=length(xd); % Total number of frequency increments

ks=0.25; o_c=0.8245; % coefficients

A=[121.07, 101.81, 68.16, 53.76, 20.95, 3.39]; % mm2rad/m, coefficients from line grade 1 to 6

Lrmax= 50; Lrmin =0.5; % Wavelength limits by Lei & Noda

omega_max=2*pi./Lrmin; omega_min = 2*pi./Lrmax; % Spatial frequency limits

delta_omega=(omega_max-omega_min)/Ny; % Frequency increment

n=1:Ny; ph_an=(2*pi).*rand(1,1);

x1 = linspace(dx,Le,Le/dx);

part1 = @(x1) cos((omega_min + (n-0.5).* delta_omega).*x1+ph_an);

part2 = sqrt((ks.*A(1,6).*o_c.^2./(((omega_min + (n-0.5) .* delta_omega).^2+o_c.^2).*(omega_min + (n-0.5) .* delta_omega).^2)).*delta_omega);

r_4 =arrayfun(@(x1)part2.*part1(x1),x1,'un',0);

%Rail profile plot

figure; hold on; title('Rail profiles');

X1 = num2cell(x1);

cellfun(@(X1) plot(r_4(X1), 'o-'), {X1}); & Line 405

xlabel('distance'); ylabel('vertical profile');

Error in QuarterCarModelr15>@(X1)plot(r_4(X1),'o-')

Error in QuarterCarModelr15 (line 405)

cellfun(@(X1) plot(r_4(X1), 'o-'), {X1});

[Rik]

Can you reply to my answer? I don't see what exactly you have edited in your question.

Answer 1

[Rik]

You need to unwind the call to see what's going on.

When you create r_4, you have set UniformOutput to false. That means it is a cell array.

Then in your cellfun call, you use normal indexing. You do that with a variable that you have first wrapped in a cell, which is unwrapped by cellfun. Unfortunately, the variable was already a cell.

cellfun(@(X1) r_4(X1), {X1});
%this will return a cell

Because it returns a cell, you are calling plot with an argument of type cell. Removing the braces in your cellfun call might be enough to solve the issue.

[Sinem Tola]

Hello,

Sorry I saw your reply late, wasn't expecting such a fast answer :) thak you very much. Rearranging the line as you described got rid of the error.

cellfun(@plot, X1, r_4);

Since it is a long code, it's still busy wtih running now. When i finally obtain the plot, i will put it here, hopefully without any trouble.

[Sinem Tola]

I have realized another mistake and corrected but now it looks fine.

Thanks again for your help. Here is the plot: