simple MATLAB question ...

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Ambreen
Ambreen 2011-6-12
ok i am writting a code in which i need to write :
U(1,1) ,U (2,2) ,U (0,3) etc
and then i am going to assign some value to these separately...
for this purpose i use 2 "for" loops as follows:
for a=0:n-1 for b=0:n-1 where n i given a number by the user in the code.. and then i use U(a,b) ,so that it may write the points itself in each iteration....
but using this method matlab shows error that "U" is not defined function... am I writting it in correct way? if not then please help and correct it ...
thanx.

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Matt Fig
Matt Fig 2011-6-12
MATLAB indexing starts at 1, not 0.
n = 5;
U = zeros(n); % Pre-allocate the memory.
for a = 1:n
for b = 1:n
U(a,b) = a+b;
end
end
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Matt Fig
Matt Fig 2011-6-12
You simply cannot index into a MATLAB array with 0. In other languages (C++ for example) you can index into an array with 0, but not MATLAB. This will error. Look:
A = [1 2 4 6 8 9];
A(1)
A(2)
A(3)
A(0) % Error...

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