Canonical Representation R←⎕CR Y

Y must be a simple character scalar or vector which represents the name of a defined function or operator.

If Y is a name of a defined function or operator, R is a simple character matrix.  The first row of R is the function or operator header.  Subsequent rows are lines of the function or operator.  R contains no unnecessary blanks, except for leading indentation of control structures, trailing blanks that pad each row, and the blanks in comments.  If Y is the name of a variable, a locked function or operator, an external function, or is undefined, R is an empty matrix whose shape is 0 0.

#### Example

```      ∇R←MEAN X    ⍝ Arithmetic mean
  R←(+/X)÷⍴X
  ∇
+F←⎕CR'MEAN'
R←MEAN X    ⍝ Arithmetic mean
R←(+/X)÷⍴X

⍴F
2 30```

The definition of ⎕CR has been extended to names assigned to functions by specification (), and to local names of functions used as operands to defined operators.

If Y is a name assigned to a primitive function, R is a one-element vector containing the corresponding function symbol.  If Y is a name assigned to a system function, R is a one element nested array containing the name of the system function.

#### Examples

```      PLUS←+
+F←⎕CR'PLUS'
+
⍴F
1
C←⎕CR
C'C'
⎕CR
⍴C'C'
1```
```      ∇R←CONDITION (FN1 ELSE FN2) X
   →CONDITION/L1
   R←FN2 X ⋄ →0
  L1:R←FN1 X
   ∇

2 ⎕STOP 'ELSE'
(X≥0) ⌊ ELSE ⌈ X←¯2.5

ELSE
X
¯2.5
⎕CR'FN2'
⌈
→⎕LC
¯2```

If Y is a name assigned to a derived function, R is a vector whose elements represent the arrays, functions, and operators from which Y was constructed.  Constituent functions are represented by their own ⎕CRs, so in this respect the definition of ⎕CR is recursive.  Primitive operators are treated like primitive functions, and are represented by their corresponding symbols.  Arrays are represented by themselves.

#### Example

```      BOX←2 2∘⍴
+F←⎕CR'BOX'
2 2 ∘⍴
⍴F
3
]display F
.→----------.
| .→--.     |
| |2 2| ∘ ⍴ |
| '~--' - - |
'∊----------'```

If Y is a name assigned to a defined function, R is the ⎕CR of the defined function.  In particular, the name that appears in the function header is the name of the original defined function, not the assigned name Y.

#### Example

```      AVERAGE←MEAN
⎕CR'AVERAGE'
R←MEAN X    ⍝ Arithmetic mean
R←(+/X)÷⍴X```