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Timeline for Is my barcode valid?

Current License: CC BY-SA 3.0

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Nov 24, 2017 at 16:59 comment added Wernisch Problem is how Excel interprets =(A1:H1): This is not handled as an array. Is invalid if placed in any column not in A-H range. If placed in a column in A-H, returns the value for that column only. (Formula in % results in %: C2 --> C1 H999 --> H1 K1 --> #VALUE!)
Nov 24, 2017 at 16:43 comment added Wernisch @RosLuP, Apologies, missed the changed ()s in your comment.
Nov 24, 2017 at 16:37 comment added user58988 I want only to say that seems that in APL goes well doing first y= (A1:H1)+2*(A1+C1+E1+G1), and after the sum and the mod; in APL not goes well first sum(A1:H1) etc something as (1,2,3)+4=(5,6,7) and than sum(5,6,7)=18; note that sum(1,2,3)=6 and 6+4=10 different from 18. But possible I make error in something
Nov 24, 2017 at 10:15 comment added Wernisch @RosLuP, not predefined, no. But Modulo, Sum, + etc do ;-)
Nov 23, 2017 at 21:40 comment added user58988 =MOD(SUM((A1:H1)+2*(A1+C1+E1+G1)),10)=0 this formula exist in Excel?
Nov 16, 2017 at 14:15 history answered Wernisch CC BY-SA 3.0