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Timeline for Double trace of a square matrix

Current License: CC BY-SA 4.0

5 events
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Oct 27, 2021 at 16:38 history edited Arnauld CC BY-SA 4.0
added a shorter version
Oct 26, 2021 at 2:01 comment added tsh You can give Array.prototype.at a try which is introduced by ES2022: m=>m.reduce((t,r,i)=>t+r[i]+r.at(~i,r[i]=0),0)
Oct 25, 2021 at 7:07 history edited Arnauld CC BY-SA 4.0
minor clarifications
Oct 24, 2021 at 12:07 history edited Arnauld CC BY-SA 4.0
added a commented version
Oct 24, 2021 at 11:46 history answered Arnauld CC BY-SA 4.0