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Apl2ToDo/FinancialAlgorithms
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A←(÷1+FS)⊥⌽NA ⍝ Present value of cash flows NA at int FS.
A←(1+FS)⊥NA ⍝ Future value of cash flows NA at int FS.
A←FA÷⍉1-(1+FA)∘.×-IA ⍝ Annuity coefficient: IA periods at int FA.
A←NA∘.×(1+FA)∘.*IA ⍝ Compound interest: IA prds, FA int, NA prn.