Why does this keep giving me the error "Not enough input arguments"

I'm a beginner at MatLab so sorry for asking this very 'noobish' question. I'm basically trying to plot the following function, f(x) = cos(x) * sin(x)

In my "main" matlab file, I have the following code:

x = 0:pi/1000:2*pi;  
third = ThirdFunction(x);

plot(x,third,'y');
axis([0 2*pi -3 3])
xlabel('X - Axis')
ylabel('Y - Axis')
title('Sinusodial Graph')

This is the code for my ThirdFunction

function [y] = ThirdFunction(x)
%FIRSTFUNCTION Summary of this function goes here
%   Used to graph the first function
y = tan(x) * sin(x);
end

Everytime I try to compile, it gives me the following error: 'Error using ThirdFunction (line 4) Not enough input arguments."

Thanks in advance :)

[Star Strider]

I ran it in a nested function and it ran without error once I used element-wise multiplication here:

y = tan(x) .* sin(x);

What specifically is ‘line 4’?

[Adam]

Do you really want to plot in yellow by the way?! You'll hardly see it on a white background!

Answer 1

[Adam]

You seem to be using tan(x) rather than cos(x).

Also you need to use .* rather than * i.e.

y = cos(x) .* sin(x);

I wouldn't think either of those would result in a not enough input arguments error though.

[Mike Smith]

Thanks so much, it was because I didn't use .* The operator simply means multiplication right?

[Adam]

.* means simply point-wise multiplication of two matrices/vectors of equal size. * is matrix multiplication so subject to the rules of that which I always manage to forget what they are!