Can someone explain what's wrong with my formula?

close all
clear
clc

syms t

omega = 2:2:6

omega = 1×3

2 4 6

I = 10

I = 10

C = 0.05

C = 0.0500

V = (-I./omega.*C)*cos(omega.*t)

Error using * (line 432)
Dimensions do not match.

fplot(V)

What is wrong with it? I get an error when I try to run it.

Answer 1

[Matt J]

Be careful of missing dots...

V = (-I./omega.*C).*cos(omega.*t)

[Kevin]

Sorry I'm still relatively new to using matlab, but thank you so much for taking your time to answer :D

Answer 2

[Walter Roberson]

omega is a vector, so (-I./omega.*C) is a vector and cos(omega.*t) is a vector the same size.

So you have 1 x 3 row vector * 1 x 3 row vector. But the * operator is algebraic matrix multiplication, "inner product". In the expresson A*B then size(A,2) must equal size(B,1) -- the "inner" dimensions must match. The first 1 x 3 vector operand for the * operation has 3 columns. The second 1 x 3 vector operand for the * operation has 1 row. But 1 is not equal to 3, so the * operation fails.

The element-by-element multiplication operator is .* instead of *