MATLAB: Do I keep getting infinity as the script answer

displayerrorinfinityinputscriptscriptsuser input

I am trying to write a script that requests user input for belt angle β(beta), friction coefficient μ(mu), and one of the forces F2. The script then computes the corresponding force F1, and reports the answer using a disp([ ]) sentence. This is my code thus far:
   prompt= 'State the belt angle beta: ';
    beta = input(prompt, 's');%degrees
    prompt= 'State the friction coefficient mu: ';
    mu = input(prompt, 's');
    prompt= 'State the Force F2: ';
    F2 = input(prompt, 's');%Newtons

    F1 = F2.*exp(mu.*beta);%Newtons
    format bank
    disp(['The corresponding force F1 is ',num2str(F1), '.']);
My script is called BeltForces.m and the result I get is this:
>> BeltForces
State the belt angle beta: 130
State the friction coefficient mu: 0.3
State the Force F2: 100
The corresponding force F1 is Inf  Inf  Inf.
Why am I getting infinity? My teacher told us to watch out for radians and to "Be careful with β, because math operations like e and sin require unitless input arguments."….Could this be why I am getting infinity?

Best Answer

You need to convert beta, mu and F2 into numbers..using str2num
prompt= 'State the belt angle beta: ';
beta = input(prompt, 's');%degrees
beta = str2num(beta) ;
prompt= 'State the friction coefficient mu: ';
mu = input(prompt, 's');
mu = str2num(mu) ;
prompt= 'State the Force F2: ';
F2 = input(prompt, 's');%Newtons

F2 = str2num(F2) ;
F1 = F2.*exp(mu.*beta);%Newtons
format bank
disp(['The corresponding force F1 is ',num2str(F1), '.']);
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