- You may remove clc from the script
- You may change the name of script and call the function after clc command
Same code, different result????
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Byeongchan Min
on 29 Apr 2020
Edited: Sai Sri Pathuri
on 5 May 2020
I made a code calculating a numerical integration of a function as the professor taught, but it made an error and couldn't get answer
but when the TA tried it with my code, just copying and pasting, she got a corect answer, while I could not:(
What's the problem
Below is my code:
clc
function f_int=trapezoid(ta,tb,n)
format long
dt=(tb-ta)/n; t=ta;
sum=0.;
sum=func(t);
for i=1:n-1
t=t+dt; sum=sum+2.0*func(t);
end
t=t+dt; sum=(sum+func(t))*dt/2;
[sum]
end
function fv=func(t)
fv=1-exp(-2*t); end
(and the file name is also 'trapezoid.m')
I know I have to input the values of ta,tb and n on the command tab, so I typed several sets of numbers but none of them gave me answers but this error:
오류: 파일: trapezoid.m 라인: 3 열: 16
함수 'trapezoid'이(가) 이미 이 범위 내에 선언되어 있습니다.
(It means function 'trapezoid' is already proclaimed in the region)
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Accepted Answer
Sai Sri Pathuri
on 5 May 2020
Edited: Sai Sri Pathuri
on 5 May 2020
In your script trapezoid, the function trapezoid is treated as a local function and hence, it cannot have same name as that of script.
clc % This is treated as command to be executed and trapezoid, func are local function
function f_int=trapezoid(ta,tb,n)
% code
end
function fv=func(t)
% code
end
This issue can be ressolved in two ways
clc
f_int=trapezoid(ta,tb,n); % Replace ta, tb, n by suitable values
function f_int=trapezoid(ta,tb,n)
% code
end
function fv=func(t)
% code
end
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