I’m starting with PDL – Perl Data Language manual, more precisely, PDL::Indexing manual, and I found a nice feature to view variables declared in current session of pdl2 interpreter: ?vars. This command is a shortcut to help vars and/or PDL->vars, it shows a report about all variables with name, data type, dimension, flow, state and memory used.
See an example:
pdl> ?vars PDL variables in package main:: Name Type Dimension Flow State Mem ---------------------------------------------------------------- $a Double D [8,4,3,2,1] P 1.50KB $area Double D [2,3] VC 0.00KB $column Double D [1,5] VC 0.00KB $cube Double D [5,5,5] P 0.98KB $even Double D [5,2] VC 0.00KB $im Double D [5,5] P 0.20KB $line Double D [5] VC 0.00KB $rgb Double D [255,255,255] P 126.51MB $row Double D [5,1] VC 0.00KB pdl> _
Variables with “VC” (Virtual Child) in the “State” column and “0.00KB” in “Mem” column are children of variables with “P” (Parent) in the “State” column. They share space and modifications will reflect on the parent variables and other children, if applicable.
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