Undefined function 'Trapzoid' for input arguments of type 'double'.

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Austin
Austin 2015-2-6
回答： Jan 2015-2-7
Hi, i keep getting this error:
Undefined function 'Trapzoid' for input arguments of type 'double'.
below are my codes:
function [output]=Trapzoid(a,b)
logN=1:8
N=zeros(1,8);
A=zeros(1,8);
for j=1:8
N(j)=10^(logN(j));
h=1/N(j);
x=a:h:b;
for i=1:N(j)+1 y(i)=exp(x(i));
end
for i=1:N(j)
A(j)=A(j)+0.5*h*(y(i)+y(i+1));
end
B(j)=log(abs(exp(1)-1-A(j)));
end
whenever i call for function Trapzoid(a,b) for eg, trapzoid(1,8) i will get the error: Undefined function 'Trapzoid' for input arguments of type 'double'. can anyone kindly advise on what actually went wrong? Much Thanks in advance!

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采纳的回答

Jan
Jan 2015-2-7
Note:
x = a:h:b;
for i=1:N(j)+1
y(i)=exp(x(i));
end
is less efficient than:
y = exp(a:h:b);

更多回答（1 个）

Star Strider
Star Strider 2015-2-6
You have to save your ‘Trapezoid’ function in its own file called specifically ‘Trapezoid.m’ in your MATLAB search path. Note that MATLAB is case-sensitive, so calling it as ‘trapezoid(1,8)’ will throw the error. Call it as ‘Trapezoid(1,8)’, and if it is in your MATLAB path, you will not get that error.

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