splitting 1 large row into multiple rows

[Rick T]

I have 1 large row with hundreds of columns in an array in octave

example of a row:  
540 6.28319 0 538.3 6.26573 0

I would like it to look like this. Every 3rd column move data to next row.

540 6.28319 0 
538.3 6.26573 0

How can I go about doing this? 

Thanks

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