`dsyr2:`procedure`xSYR2`performs the symmetric rank 2 operation`A := alpha*x*y' + alpha*y*x' + A`.`ALPHA`is a scalar,`X`and`Y`are`N`element vectors, and`A`is an`N x N`symmetric matrix.

`dsyr2:`procedure`xSYR2`performs the symmetric rank 2 operation`A := alpha*x*y' + alpha*y*x' + A`.`ALPHA`is a scalar,`X`and`Y`are`N`element vectors, and`A`is an`N x N`symmetric matrix.