How to load file with variable length lines?

[Mike Miller]

Suppose I have a file called x.txt with three lines that looks like this:

1
1 2
1 2 3

I would be happy to have it load into Octave with, say, this form:

1 NaN NaN
1  2  NaN
1  2   3

That is, I want to pad the ends of shorter lines with NaNs (or anything 
else you can come up with).  Is there an Octave function that will do this 
for me?

I see the function "aload" but I can't get it to do what I want.  If no 
such function exists, I may be able to create one.

Mike



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