Decimal Comparison Tolerance ⎕DCT

The value of ⎕DCT determines the precision with which two numbers are judged to be equal when the value of ⎕FR is 1287. If ⎕FR is 645, the system uses ⎕CT.

⎕DCT is an implicit argument of:

• monadic functions: ⌈, ⌊, ∪, ≠
• dyadic functions: ~, <, ≤, =, ≥, >, ≠, ≡, ≢, ⍳, ∊, ∪, ∩, ⍷, |, ∨, ∧
• operators: ⌸
• system functions: ⎕FMT

⎕DCT may be assigned any value in the range from 0 to 2*¯32 (about 2.3283064365386962890625E¯10). A value of 0 ensures exact comparison. The value in a clear workspace is 1E¯28. ⎕DCT has Namespace scope.

For further information, see Comparison Tolerance.

Examples

      ⎕DCT←1E¯10
      1.00000000001 1.0000001 = 1
1 0