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Y must be a simple character scalar, vector or matrix, or a vector of character vectors containing a list of names. R is a simple integer vector of non-negative elements with the same length as the number of names in Y.
If the name in Y identifies an object with an active referent, the workspace required in bytes by that object is returned in the corresponding element of R. Otherwise, 0 is returned in that element of R.
The result returned for an external variable is the space required to store the external array. The result for a system constant, variable or function is 0. The result returned for a GUI object gives the amount of workspace needed to store it, but excludes the space required for its children.
Note: Wherever possible, Dyalog APL shares the whole or part of a workspace object rather than generates a separate copy; however ⎕SIZE reports the size as though nothing is shared. ⎕SIZE also includes the space required for the interpreter's internal information about the object in question.
⎕VR 'FOO' ∇ R←FOO  R←10 ∇ A←⍳10 'EXT/ARRAY' ⎕XT'E' ⋄ E←⍳20 ⎕SIZE 'A' 'FOO' 'E' 'UND' 28 76 120 0