value search using functions
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how do i use the fzero function or any other MATLAB function to find/verify the value of 'a', like i have done using the cubic spline method. (i am pretending that i don't know what that value is)
a=5;
w=-a:a/1000:a;
F=2*sin(a*w)./w;
%
%
w_int=-5:0.01:5;
F_int=spline(w,F,w_int);
plot(w_int,F_int,'o');
plot(w,F, '--', w_int,F_int,'o')
c = max(F_int);
[~, idx] = min(abs(w_int - 0.005));
d = w_int(idx);
a1 = (c*d)/(2*sin(d));
采纳的回答
Walter Roberson
2013-8-21
0 个投票
You cannot do that. fzero() is based upon the assumption that when upper and lower bounds are provided, that they are constant, not values that vary according to the current "x" value. (Your "w" varies from -a to +a rather than being fixed.)
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