vector input to function

2012 12 27
2 个回答
7 次查看（30 天）

0 个投票

Hi - this is a simple question, more about syntax.
I want to compute a function on a vector.
The function is the procrustes distance function which takes 2 nxm matrices.
procustes( nxm , nxm)
I want to compute it for a ND volume.
For example for a 3D volume
X = rand(2,3,5);
t = 1:5
d = procrustes(X(:,:,t),X(:,:,t));
hoping that d is a 1:5 vector
thanks

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回答（2 个）

Wayne King
Wayne King 2012-12-27
编辑：Wayne King 2012-12-27

1 个投票

Then you need to use a for loop and store the results
X = rand(2,3,5);
Y = randn(2,3,5);
for nn = 1:size(X,3)
d(nn) = procrustes(X(:,:,nn),Y(:,:,nn));
end
I'm assuming you actually meant to have a different matrix than X as the other input.

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Vesco
Vesco 2012-12-27
Thank you Wayne. I am currently using a for loop and yes the matrices are different. I was looking for a one-liner tho.
Jan
Jan 2012-12-28
One-liners are more compact and therefore nicer, but not necessarily faster. When they are harder to create and to debug than an loop approach, it is questionable if they are useful.

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Walter Roberson
Walter Roberson 2012-12-27

1 个投票

d = arrayfun( @(K) procrustes( X(:,:,K), Y(:,:,K) ), 1 : size(X,3) );

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Vesco
Vesco
2012-12-27

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