Pass a function as argument Matlab6.1

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David Daminelli
David Daminelli 2019-5-25
回答： Walter Roberson 2019-5-25
Hello! I'm studing matlab and I get some problem with a code.
First, I've created f1.m:
function y = f1(x)
y = exp(x) - pi;
end
Then, I built a code to find the roots by bisector method:
function [root, err, n] = bissect(f, a, b, errMax)
m = (a+b)/2;
err = (b-a)/2;
n = 0;
while err > errMax
if f(a)*f(m) > 0
a = m;
else
b = m;
end
m = (a+b)/2;
err = (b-a)/2;
n = n + 1;
end
root = m;
end
But, when i run
>> [r,err,n] = bissect(@f1, 1, 2, 0.1);
it returns:
Warning: Subscript indices must be integer values.
>In C:\matlabR12\work\Codigo\bissect.m at line 12
??? Index exceeds matrix dimensions.
Error in ==> C:\matlabR12\work\Codigo\bissect.m
On line 12 ==> if f(a)*f(m) > 0
What am I doing wrong? I'm using Matlab R12

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回答（1 个）

Walter Roberson
Walter Roberson 2019-5-25
Looking at an old document https://web.stanford.edu/class/ee254/software/using_ml.pdf it appears that in R12, function handles existed, but that you needed to use feval() with them, such as
if feval(f,a)*feval(f,m) > 0

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