how create correct function

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fatema saba
fatema saba 2014-11-28
评论： fatema saba 2014-11-28
Hi I wrote something like that and I think it is a function but I got some errors when I run it. What is mistake?
function t = Aineq(k1,q,e,a,b)
m=input('input m=')
n=input('input n=')
q=sparse(m*n,m*n)
e=speye(m*n)
k1=-4*e
a=constraint12b(m,n)
b=constraint12c(m,n)
t=[k1 q e q;q k1 q e;a q e q;q a q e;b q -e q;q b q -e]
end
I point that constraint12b and constraint12c are functions separately and could be ran correctly.
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Guillaume
Guillaume 2014-11-28
The code that you posted in your question does not match the error message that you've just posted. Line 2 in your question is:
m=input('input m=')
whereas according to the error, it is:
q=sparse(m*n,m*n)
Obviously, if you remove the line that creates m, then it's not going to be defined.
In the future, please post the exact code you use, otherwise you're sending us on a wild goose chase.
Anyway, Azzi's answer should be what you're looking for.
fatema saba
fatema saba 2014-11-28
Thank you for your attention but I send the image of my function to you again. I exactly received the error that I sent you before
my error:
>> t = Aineq(k1,q,e,a,b) ??? Undefined function or variable 'm'.
Error in ==> aineq at 2
q=sparse(m*n,m*n)

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Azzi Abdelmalek
Azzi Abdelmalek 2014-11-28
Your function should be something like this
function t = Aineq(m,n)
q=sparse(m*n,m*n)
e=speye(m*n)
k1=-4*e
a=constraint12b(m,n)
b=constraint12c(m,n)
t=[k1 q e q;q k1 q e;a q e q;q a q e;b q -e q;q b q -e]
save this as Aineq.m, then if you want to run your function, you have to use another script or from Matlab windows command
n=10
m=20
t = Aineq(m,n)

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