Today it was bugging me that there is no tritosquare, to provide another way to make a lower-triangular matrix. Now there is, on git master and soonish to be released: 
pdl> p ones(10)->tritosquare

[
 [1 0 0 0]
 [1 1 0 0]
 [1 1 1 0]
 [1 1 1 1]
]

[download]

In reply to Re^3: first stumbling steps in PDL by etj
in thread first stumbling steps in PDL by Discipulus

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