Fix nvert for scalar data file #8

Job	Run time
maturin-linux (x86_64)	58s
Publish to crates.io	17s
maturin-macos (x86_64)	40s
maturin-linux (aarch64)	1m 20s
build (ubuntu-latest, armv7-unknown-linux-gnueabihf, use-cross)	42s
maturin-macos (aarch64)	50s
build (ubuntu-latest, aarch64-unknown-linux-gnu, use-cross)	45s
maturin-linux (armv7)	2m 25s
build (ubuntu-latest, aarch64-unknown-linux-musl, use-cross)	31s
maturin-sdist	14s
build (ubuntu-latest, powerpc-unknown-linux-gnu, use-cross)	59s
build (ubuntu-latest, powerpc64-unknown-linux-gnu, use-cross)	1m 6s
maturin-windows (x64)	2m 48s
build (ubuntu-latest, powerpc64le-unknown-linux-gnu, use-cross)	1m 6s
build (ubuntu-latest, riscv64gc-unknown-linux-gnu, use-cross)	35s
build (ubuntu-latest, x86_64-unknown-linux-gnu, use-cross, deb)	2m 34s
build (ubuntu-latest, x86_64-unknown-linux-musl, use-cross, true)	23s
build (macos-latest, x86_64-apple-darwin)	32s
build (macos-latest, aarch64-apple-darwin)	1m 18s
build (windows-latest, x86_64-pc-windows-gnu)	2m 56s
build (windows-latest, x86_64-pc-windows-msvc)	1m 59s
upload-release	5s
Release	22s
	25m 25s

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