Strand Assignment: Difference between revisions
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For example, <apl size="large">(A B C){is}{enclose}{iota}3</apl> | For example, <apl size="large">(A B C){is}{enclose}{iota}3</apl> is the same as <apl size="large">A{is}B{is}C{is}{iota}3</apl>. In contrast, <apl size="large">(A B C){is}{iota}3</apl> is the same as <apl size="large">A{is}1 {diamond} B{is}2 {diamond} C{is}3</apl>.<br />Also, <apl size="large">(A B C){is}(1 2) 'abc' 1.1</apl> is the same as <apl size="large">A{is}1 2 {diamond} B{is}'abc' {diamond} C{is}1.1</apl>, and <apl size="large">(A B){is}B A</apl> is a simple and efficient way to swap the values of the two names. | ||
Revision as of 08:57, 9 April 2008
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| A1 A2 ... An are assignable names, R is a scalar or vector. | ||||
| If 1<⍴⍴R, signal a RANK ERROR. | ||||
| If R is a scalar or one element vector, its item is assigned to each name, as in Ai←⊃⍬⍴R. | ||||
| Otherwise, assume there are n names in the list: | ||||
| If n≠⍴R, signal a LENGTH ERROR. | ||||
| Otherwise, each successive item of R is assigned to each successive name, as in Ai←i⊃R. |
For example, (A B C)←⊂⍳3 is the same as A←B←C←⍳3. In contrast, (A B C)←⍳3 is the same as A←1 ⋄ B←2 ⋄ C←3.
Also, (A B C)←(1 2) 'abc' 1.1 is the same as A←1 2 ⋄ B←'abc' ⋄ C←1.1, and (A B)←B A is a simple and efficient way to swap the values of the two names.
