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DecToAlpha ( decimal )

Returns the representation of a decimal number as a variable-length alphabetic text string.

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Michael Horak - Show more from this author *COMMENT Visual Realisation

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/* DecToAlpha function Author *COMMENT Visual Realisation Format DecToAlpha ( decimal ) Parameters decimal - any numeric expression or field containing a non-negative numeric expression. NOTE: Only the integer part of decimal will be considered. Data type returned text Description Returns the representation of a decimal number as a variable-length alphabetic text string. January 18, 2006 */ Let ( [ alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" ; base = Length ( alpha ) ; bit = Mod ( decimal ; base ) ; char = Middle ( alpha ; bit + 1 ; 1 ) ; next = Div ( decimal ; base ) ] ; Case ( next ; DecToAlpha ( next - 1 ) ) & char ) Click to copy

Returns the representation of a decimal (base-10) number as a variable-length alphabetic text string, similar to the column headings in Excel: A, B, C ... Z, AA, AB ... AZ, BA, BB ... ZZ, AAA, AAB ... ZZZ, AAAA, AAAB, etc.

NOTE:
DecToAlpha expects numbers to start at 0 (zero). In other words, DecToAlpha (0) returns "A", while DecToAlpha (1) returns "B". If your numbers start at 1, and you want the number 1 to be represented as "A", use DecToAlpha (decimal - 1).

 

Comments

		Alex Mead Oct 27, 2020
I'm trying to figure out how to reverse this process to ultimately create an increment script. Idea is that I turn a, alpha field (A,B,C...AA,AB...ZZ) into a decimal, then +1, then turn back into an alpha. Has anyone come across this or found a solution? Many thanks!

		Michael Horak, *COMMENT Visual Realisation Oct 27, 2020
Post your question on one of the forums (e.g. https://fmforums.com/).

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