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M-file for exercise!!!

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evi
evi il 5 Dic 2013
Modificato: Andreas Goser il 5 Dic 2013
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 Commenti
per isakson
per isakson il 5 Dic 2013
the debugger and the profiler works better with functions
evi
evi il 5 Dic 2013
So,do you think that the error message I get has to do with the debugger and the profiler??

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Risposte (2)

sixwwwwww
sixwwwwww il 5 Dic 2013
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
  8 Commenti
evi
evi il 5 Dic 2013
Modificato: evi il 5 Dic 2013
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 il 5 Dic 2013
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 il 5 Dic 2013
Modificato: Andreas Goser il 5 Dic 2013

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