how to use fzero?

the code im trying to run is

m1=input('Enter Mach number=');

y=input('Enter the Specific Heat ratio of working fluid=');

ang=input('Enter theta =');

syms b

t=ang*(pi/180);

f=tan(t)-2*cot(b)*((((m1^2)*(sin(b))^2)-1)/((m1^2*(y+cos(2*b)))+2));   

fzero(f,25)

what i actually need is to find the value of b which makes the function "f" zero where t,m1 and y are numerical values. so i need to solve the above equation for b. any tips how i can do this?

Answer 1

[Matt J]

Omit the symbolic operations, if you plan to solve numerically

m1=input('Enter Mach number='); 
y=input('Enter the Specific Heat ratio of working fluid=');
ang=input('Enter theta =');

t=ang*(pi/180);

f=@(b) tan(t)-2*cot(b)*((((m1^2)*(sin(b))^2)-1)/((m1^2*(y+cos(2*b)))+2));   

fzero(f,25)

[Qasim Manzoor]

does that mean that fzero isnt compatible with syms?

[Matt J]

That's right, it is not a symbolic solver. For that you would use solve(). However, there doesn't appear to be any reason to be doing symbolic computations in this situation.