fsolve error: Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue.

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Mac
Mac 2016-3-16
编辑： Mac 2016-3-16
Can someone help me fix my function here? The error message I am getting is as above. My input is : c2=roots([1,-2*b2*cos(A2*pi/180),b2^2-b1^2-c1^2+2*b1*c1*cos(A1*pi/180)]);
for n=1:numel(c2)
if c2(n)>0 c2(n) end end %%
A1=120; A2=100; b1=180; b2=165; c1=115;
type quadrat
c2 = fsolve (@quadrat,100)
Still very new to Matlab, so it may be a very basic error. I can also give the whole problem if needed
Full error message: Error using feval
Attempt to execute SCRIPT quadrat as a function: C:\Users\mcange3\Documents\MATLAB\quadrat.m
Error in fsolve (line 219) fuser = feval(funfcn{3},x,varargin{:});
Error in quadrat (line 15)
c2 = fsolve (@quadrat,100)
Caused by: Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue.

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