Trying to plot a function

I am trying to plot the following function and have the period after "theta_shock", but I am getting an error of "Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters"

theta_shock = 0:90

M = 2

g = 1.4

half_cone = atand((M^2*sind(theta_shock.)-1)/(M^2*(g+cosd(2*theta_shock.))+2))

plot(theta_shock,half_cone)

What am I doing wrong and how do I fix this?

[Dyuman Joshi]

@Evan Gehret, please respond to the answers given on your earlier questions.

Answer 1

[Sulaymon Eshkabilov]

Here is the fixed code:

theta_shock = 0:90;
M = 2;
g = 1.4;
half_cone = atand((M^2*sind(theta_shock)-1)./(M^2*(g+cosd(2*theta_shock))+2));
plot(theta_shock,half_cone)

[Dyuman Joshi]

The source of the error were the fullstops present after theta_shock

Removing them and using the element-wise division for numerator and denominator gave the correct output.