initialzie beta vector #1380

Job	Run time
macos-latest: clang++ Release Threads	11m 56s
macos-latest: clang++ Release OneTBB	3m 35s
macos-latest: clang++ Release PaRSEC	4m 53s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	23m 26s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	3m 16s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	3m 20s
macos-latest: clang++ Debug Threads	26m 9s
macos-latest: clang++ Debug OneTBB	4m 4s
macos-latest: clang++ Debug PaRSEC	3m 53s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	23m 11s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 35s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 42s
	1h 53m 0s

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