M-file for exercise!!!

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evi
evi 2013-12-5
编辑： Andreas Goser 2013-12-5
Hi!I have to create an m-file for an exercise and I wanted to ask you what is the difference between a function and a script.Which of them is better??
  2 个评论
per isakson
per isakson 2013-12-5
the debugger and the profiler works better with functions
evi
evi 2013-12-5
So,do you think that the error message I get has to do with the debugger and the profiler??

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回答（2 个）

sixwwwwww
sixwwwwww 2013-12-5
If you want to re-use some operation again and again then function is better and if you just wanted to start writing codes in MATLAB then script is better at first. Better or not depends upon functionality usually
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evi
evi 2013-12-5
编辑：evi 2013-12-5
The function is like that:
function[]=test(x_0,dimension,e,maxit) H=hilb(dimension); A=H; for j=1:dimension b(j)=sum(A(j,:)); exact(j)=1; end b=b'; exact=exact'; P=diag(diag(A)); F=A-P; x=-P\F*x_0+P\b; end
and the script is like that:
dimension=input('Give dimension: ');
H=hilb(n);
A=H;
e=input('Give e: ');
maxit=input('Give maxit: ');
x_0=input('Give x_0: ');
for j=1:dimension
b(j)=sum(A(j,:));
exact(j)=1;
end
b=b';
exact=exact';
P=diag(diag(A));
F=A-P;
x=-P\F*x_0+P\b;
When I run the function for dimension=50,e: 0.00001,maxit: 50,x_0: zeros(50,1),I get a result,but when I run the script I get this message: ??? Error using ==> mtimes Inner matrix dimensions must agree.
Error in ==> ll at 15 x=-P\F*x_0+P\b
Why does this happen???What have I done wrong???
sixwwwwww
sixwwwwww 2013-12-5
I am getting result both from your script and function. Following are the inputs: For function
test(zeros(50, 1), 50, 0.00001, 50)
For script
Give dimension: 50
Give e: 0.00001
Give maxit: 50
Give x_0: zeros(50, 1)
then why you dont get correct result. Can you check what inputs you give to both your function and script?

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Andreas Goser
Andreas Goser 2013-12-5
编辑：Andreas Goser 2013-12-5

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