problems using bisection method to find a maximum
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while abs(a-b)>.001
c = (a + b)/2;
if (abs(y_int(1,find(abs(((c./x_int)-1))<.0001))-maxP)<.001)
break;
elseif (y_int(1,(find(abs(((a./x_int)-1))))<.001) > y_int(1,(find(abs(((b./x_int)-1))))<.001))
b=c;
else
a=c;
end
end
So, I want a and b to converge upon a max, and yet they always seem to go to the minimum in the domain i specify. I'm using a spline, not a specific equation. Just to clarify the if and elseif lines. The if line says, if the power that I get at point c is really close to the maximum Power then stop. The elseif line says, if the power at A is greater than the power at B, then make b equal to c, otherwise make a=c. Can anybody see whats wrong?
1 个评论
Walter Roberson
2011-9-28
I recommend you calculate
t = abs(((c./x_int)-1));
right after you assign c in the loop, and that you then replace the occurrences of that expression with the variable.
I also recommend you switch to logical indexing instead of using find().
I think the code will come out cleaner, more readable, and faster.
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