System Function DR
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Monadic Function


R is an arbitrary array.  
Z is a numeric scalar which represents the datatype of R. 
The datatypes are encoded with a unique index in the loworder two digits, and the bits per element in the remaining digits:
 Boolean: 100, one bit per element
 Character: 1601, 16 bits per element
 Integer: 6402, 64 bits per element
 Floating Point: 6403, 64 bits per element (double precision)
 Arithmetic Progression Array: 6404 64 bits each for the offset and multiplier
 Heterogeneous: 3208, 32 bits per element (each is a pointer)
 Nested: 3210, 32 bits per element (each is a pointer)
For example,
⎕DR 2 100⍴1
100
⎕dr ⌈/⍬
6403
Dyadic Function


R is an arbitrary array.  
L is an integer scalar datatype (see the table above).  
Z is R where each of the values are converted to the datatype indicated by L. 
For example,
1601 ⎕dr 65 49
A1