Anyone know why it isnt accepting my cos(2x) ?

x = -pi:2*pi;
f(x) = (cos(2.*x));

plot (f)

Answer 1

[Ameer Hamza]

x = -pi:2*pi;
f = cos(2.*x); % f(x) is wrong
plot(x, f)

[Alejandra Caballero]

thank you so much! by any chance do you know why my other code is wrong?

x = 0:5
f = (e.^-0.5x).*(cos(15.*x));
g = -2x + 2;
h = (x^2-x+3)/(x-8);
q = sqrt(x)

[Stephen23]

e is not a defined constant. Use exp(x) to calculate e^x

Most likely you will also need element-wise division here:

h = (x^2-x+3)./(x-8);
%            ^^

unless you really are trying to solve systems of linear equations.

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

[Ameer Hamza]

@Stephen Cobeldick: Thank you!

Answer 2

[galang andaru ibnu tetuko]

how to find max value and error of cos(2x)