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Error using / Matrix dimensions must agree...

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Salih Korkut
Salih Korkut on 10 Jun 2020
Edited: Fabio Freschi on 10 Jun 2020
Below is my script:
clc;
clear;
clear all;
% plotting frequency-current graph according to variable frequency values
f=100:100:100000; % variable frequency values
V=3.536; % AC voltage source
L=33*10^-3; %inductor (henry)
C=47*10^-9; %capacitor (farad)
R=820; %resistor (ohm)
W=2*(pi)*f; % Angular frequency formula
XL=W*L; % inductor impedance
XC=1/(W*C); % capacitor impedance
Z=(2*R)+1i*(XL-XC); % total impedance
I=V/Z; % current
plot(f,I)
May I know why I keep getting this error and how can I fix?
Error using /
Matrix dimensions must agree.
Error in deney3_2 (line 14)
XC=1/(W*C); % capacitor impedance

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Answers (1)

Fabio Freschi
Fabio Freschi on 10 Jun 2020
Edited: Fabio Freschi on 10 Jun 2020
f is a vector, as well as W. So you must use the dotted version of the division (that is ./ that performs the operation elementwise). You may find more information here
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
clear;
clear all;
% plotting frequency-current graph according to variable frequency values
f=100:100:100000; % variable frequency values
V=3.536; % AC voltage source
L=33*10^-3; %inductor (henry)
C=47*10^-9; %capacitor (farad)
R=820; %resistor (ohm)
W=2*(pi)*f; % Angular frequency formula
XL=W*L; % inductor impedance
XC=1./(W*C); % capacitor impedance
Z=(2*R)+1i*(XL-XC); % total impedance
I=V./Z; % current
figure,plot(f,I)
Note that you are plotting only the real part, as noticed in the warning

  1 Comment

KSSV
KSSV on 10 Jun 2020
Read about element by element operations in MATLAB.

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