using cat() to create blog diagonal matrix

[zhuangbinnan]

I tried to use cat([1,2],A,B) to build a block diagonal matrix with matrices A and B as the diagonal element as suggested by the Julia documents. It simply does not support this.

[pfitzseb]

That's because Juno ships with Julia 0.3.x, where this is not yet supported (see the docs for that version here).

If you download Julia 0.4 and point Juno to it, the above will actually work (although Juno doesn't officially support 0.4 yet and you may need to fix some things first).
And it's always a good idea to try those things in the REPL first and rule out that your issue is a problem with Julia itself.

[zhuangbinnan]

Thanks for the information. I will try Julia 0.4.

On Wed, May 27, 2015 at 10:35 AM, Varanas notifications@github.com wrote:

That's because Juno ships with Julia 0.3.x, where this is not yet
supported (see the docs for that version here
http://docs.julialang.org/en/release-0.3/stdlib/arrays/#Base.cat).

If you download Julia 0.4 and point Juno to it
http://junolab.org/docs/install-manual.html, the above will actually
work (although Juno doesn't officially support 0.4 yet and you may need to
fix some things first).
And it's always a good idea to try those things in the REPL first and rule
out that your issue is a problem with Julia itself.

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