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what's wrong here? I have copied this code from my textbook and it's not working

2 次查看（过去 30 天）
B
B 2015-5-5
评论： B 2015-5-5
Help me here plz:
------------------------------------------------
function xb=insearch(func,xmin,xmax,ns)
if nargin <4;
ns=50;
end
x=linspace(xmin,xmax,ns);
f=func(x);
nb=0;
xb=[];
for k=1:length(x)-1;
if sign (f(k))~=sign(f(k+1))
nb=nb+1;
xb(nb,1)=x(k);
xb(nb,2)=x(k+1);
end
end
if isempty(xb)
disp('no brackets found')
disp('check interval or increase ns')
else
disp('number of brackets:')
disp(nb)
end
and In the command window:
insearch (@x sin(10*x)+cos(3*x),xmin,xmax,ns)
and am getting the following error:
Error: Unexpected MATLAB expression.

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采纳的回答

Walter Roberson
Walter Roberson 2015-5-5
insearch (@(x) sin(10*x)+cos(3*x),xmin,xmax,ns)
notice I changed the @x to @(x)

更多回答（1 个）

Ahmet Cecen
Ahmet Cecen 2015-5-5
Your problem is here:
insearch (@x sin(10*x)+cos(3*x),min,max,ans)
It is NOT:
@x sin(10*x)+cos(3*x)
It is:
@(x) sin(10*x)+cos(3*x)

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