`zher2k:`procedure`xHER2K`performs one of the hermitian rank 2k operations`C := alpha*A*conjg(B') + beta*C`or`C := alpha*conjg(B')*A + beta*C`.`ALPHA`and`BETA`are scalars,`A`and`B`are`N x K`or`K x N`matrices, and`C`is an`N x N`hermitian matrix.

`zher2k:`procedure`xHER2K`performs one of the hermitian rank 2k operations`C := alpha*A*conjg(B') + beta*C`or`C := alpha*conjg(B')*A + beta*C`.`ALPHA`and`BETA`are scalars,`A`and`B`are`N x K`or`K x N`matrices, and`C`is an`N x N`hermitian matrix.