Two questions about plotting with Octave

[Zumsel]

I'm still a newbie with octave, so may questions may be pretty basic:

1. Say I have to matrices data1 and data1, with two columns and n and m rows
respectively. Assume n < m. The first column is a time-coordinate, so
data2(1:n,1) is identical to data1(:,1). With

plot( data1(:,1) , [data1(:,2) ; data2(1:n,2) ])

I can plot the first column of data1 versus the second column of data1 and
the first n entries of the second column of data2. However I can't plot 

plot( data2(:,1) , [data1(:,2) ; data2(:,2) ])

because data1(:,2) is too short. Is it somehow possible to have data1(:,2)
and data2(:,2) in the same plot, even though the first one is shorter?

2. With

loglog( data1(:,1) , data1(:,2) )

both axes are logarithmic. Is it possible to have only the second axis
logarithmic? Of course 

plot( data1(:,1) , log(data1(:,2)) )

would give the correct plot, though with incorrect labeling of the second
axis.

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