I am trying to create a button in GUIDE that calculates the impedance modulo, but it gives me an error. Any help would be much appreciated!

frekvencija = [1, 10, 50, 100, 200, 300, 500, 1000];

R = 100;

x1 = load('1Hz.mat');

x2 = load('10Hz.mat');

x3 = load('50Hz.mat');

x4 = load('100Hz.mat');

x5 = load('200Hz.mat');

x6 = load('300Hz.mat');

x7 = load('500Hz.mat');

x8 = load('1000Hz.mat');

Um = [x1, x2, x3, x4, x5, x6, x7, x8];

struja = Um/R; %moduo struje

strujafft=abs(fft(struja)); %brza furijeova transformacija u frekvencijskom

[struja_max_amp, Index]= max(strujafft); %uzimamo maksimalnu amplitudu, index je na kom mestu se nalazi

struja_maxt = struja_max_amp/(length(strujafft)/2); %amplituda izracunate struje u vremenskom domenu

moduo = 1/struja_maxt; %moduo |Z(s)| , napon = 1V, zato je 1/struju;

axes(handles.axes3)

plot(frekvencija, moduo)

w = 2*pi*frekvencija;

M = zeros(length(w), 3);

O = zeros(length(moduo), 1);

for i = 1:length(Z)

M(i, :) = [1, w(i)^2, -w(i)^2*moduo(i)^2];

O(i, :) = [moduo(i)^2];

end

N =((M'*M)^(-1))*M'*O;

%A = R1+R2; B = R1*R2*C; D = R2*C;

A=sqrt(N(1));

B=sqrt(N(2));

D=sqrt(N(3));

R1 = A - R2;

R2 = D/C;

C = B/R1*R2;

guidata(hObject, handles);

The following is the full error I receive:

Error using /

Arguments must be numeric, char, or logical.

Error in domaci1>pushbuttonIscrtaj_Callback (line 290)

struja = Um/R; %moduo struje

Answer 1

[Cris LaPierre]

Um is an array of structures. This is likely the source of your error. To use "/", the arguments must be numeric, char, or logical. I don't know what the variables names are in your mat files, but assuming they are the same as your intended variable names, you need to do something like this

% Assumes your field names are the same as structure name
% If not, adjust the field name to match your data
Um = [x1.x1, x2.x2, x3.x3, x4.x4, x5.x5, x6.x6, x7.x7, x8.x8];

[Kasandra Brandic]

These are the variable names in my mat file.

Thank you for your response.