Saving in Octave

[asha g]

 I am saving my data in Octave and have a command 

save cabun vvvv x vv1 vvN

How do I know that the saved data is in .mat format. Can I read the data in 
this format? I had sent it to someone to plot in Mayavi( Python) and they said 
that what I sent them was in text format and not .mat format. I thought that 
the default option in Octave was .mat while saving. I am using Octave 3.01 with 
Ubuntu OS. 

Please help.

Thanks 

Asha 


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