How to delete the diagonal elements of a matrix?

[El Afrit Mariem]

Hey,

In order to delete the diagonal of a matrix, guarded list comprehensions a la python would be the easiest but Julia does not support it yet.

I tried the matlab syntax too:

r = rand(5,5)

r(1:6:end)=[]

reshape(r,5,4)

which does not work with Julia.

As a temporary solution, I found that:

 

r[eye(5).==0] | v->reshape(v,5,4)

Is there a better solution?

cheers

Mariem

[Stefan Karpinski]

Can you expand on what you mean by "delete"?

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[Mariem El Afrit]

I mean from an (n,n)-object we get an (n,n-1)-object after remooving physically the diagonal elements. 

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Mariem

[Stefan Karpinski]

I would probably write it as an n by n-1 comprehension.

Filtered comprehensions really only make sense for the 1d case. For other dimensions there's no way to ensure that the resulting shape is an n-rectangle.

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