2-D discrete graphs

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AGD
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2-D discrete graphs

AGD
Hello,

I have two queries:

1) How do I construct a 2-D discrete plot in Octave(3.0.1)? say for instance, I want to plot x[1 2 1 2] for the sample intervals [0 1 2 3]. The graph commands I tried all give continuous plots.

2) After I construct a discrete plot from the intervals 0 to 3, how can I increase the number of samples for the same graph?