Naming Conventions
	Scalar	Vector	Matrix	Any rank	Non- scalar
Boolean	`BS`	`BV`	`BM`	`BA`	`BN`
Integer	`IS`	`IV`	`IM`	`IA`	`IN`
Float	`FS`	`FV`	`FM`	`FA`	`FN`
Numeric	`NS`	`NV`	`NM`	`NA`	`NN`
Character	`CS`	`CV`	`CM`	`CA`	`CN`
Enclosed vector	`ES`	`EV`	`EM`	`EA`	`EN`
enclosed Text vector	`TS`	`TV`	`TM`	`TA`	`TN`
Simple	`SS`	`SV`	`SM`	`SA`	`SN`
Any	`AS`	`AV`	`AM`	`AA`	`AN`
phrase e.g.: `.X...Y. ⍝ X←BS; Y←IV`
combinations: use `ISV` for Integer scalar`∨`vector
`B3`, `I4` &c. to specify higher ranks.

JoinDate

Transform a numeric vector (Y M D ...) or simple matrix with three or more columns into a scalar or vector of Integers representing YYYYMMDD per item.

      100⊥3↑[⎕IO]⍉IA

Examples

      100⊥3↑[⎕IO]⍉ 2010 8 29 112
20100829
      100⊥3↑[⎕IO]⍉ ⊃(2010 8 29 112) (999 1 2)
20100829 9990102
      100⊥3↑[⎕IO]⍉⊃(2010 8 29 112)(999 1 2 0)(3000 1 1 0)(3000 12 31 0)
20100829 9990102 30000101 30001231

Compatibility

Checked with: APL2, APLX, Dyalog, NARS2000 Add as many as you can/like

Test Cases

Replace "PhraseName" accordingly Show Hide test cases test cases

Test
 ⎕IO←0      ⍝ You may change this; however, zero IS the default in the PhraseBook
  ⎕FX ⍕2 1⍴'r←JoinDate y' 'r← 100⊥3↑[⎕IO]⍉y'   
⍝ ---- Start Test cases (do not delete this!)
20100829 ≡ JoinDate 2010 8 29 1 2 3 4
10203 ≡ JoinDate 1 2 3 4
10203 10001231 19990102 ≡ JoinDate ⊃(1 2 3 4) (1000 12 31) (1999 1 2)
20100829 9990102 30000101 30001231≡100⊥3↑[⎕IO]⍉⊃(2010 8 29 112)(999 1 2 0)(3000 1 1 0)(3000 12 31 0)
0 ≡ JoinDate 0 0 0
0 ≡ JoinDate ⍳0

For details see the PhraseBook/TestCasesGuidelines.

Test my code, both Examples and Test Cases.

PhraseBook/JoinDate

JoinDate

Examples

Compatibility

Test Cases