Is there a function for sum of square matrix antidiagonal like "trace()"

hermann on Mon, 18 Nov 2024 13:18:50 +0100

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Is there a function for sum of square matrix antidiagonal like "trace()" for main diagonal?

To: pari-users@pari.math.u-bordeaux.fr
Subject: Is there a function for sum of square matrix antidiagonal like "trace()" for main diagonal?
From: hermann@stamm-wilbrandt.de
Date: Mon, 18 Nov 2024 13:18:45 +0100
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I used below code, is there something shorter?

  assert(isprime(trace(ps)));
  assert(isprime(vecsum([ps[i,#ps+1-i]|i<-[1..#ps]])));

Regards,

Hermann.

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