"Undefined function" error when using multiple anonymous functions

I'm writing a script that defines several anonymous functions, many of which reference other functions. However, one particular function always returns an "undefined function" for one of its nested functions each time I call it.

b = 3.048; % wing span, meters
B = .2286; % ball diameter, m
t = .0762; % extra fuselage material, m

a_w = @(AR,f_w)((b^2)./AR)-(c(AR).*f_w); % planform area (fuse accounted for)
c = @(AR) (10*b)./(9*AR); % chord length 

>> c(5:12)

ans =

    0.6773    0.5644    0.4838    0.4233    0.3763    0.3387    0.3079    0.2822
>> a_w(5:12,B+t)
Undefined function or variable 'c'.

Error in LiveEditorEvaluationHelperESectionEval>@(AR,f_w)((b^2)./AR)-(c(AR).*f_w)

As you can see above, if I call c by itself, it functions normally. When I call a_w, however, it returns an undefined function error for c.

I feel like I've got to be missing something obvious. Any help would be greatly appreciated!

[madhan ravi]

Values of B , t and b??

[Joseph Skelley]

Updated to include these values.

Answer 1

[madhan ravi]

Define c anonymous function before a_w and everything will be fine.

[Joseph Skelley]

That's the ticket. Thanks!