CAS.checksum: Test the check digit of a CAS number to confirm validity
In httk: High-Throughput Toxicokinetics
View source: R/add_chemtable.R
CAS.checksum R Documentation
Test the check digit of a CAS number to confirm validity
Description
Chemical abstracts services registry numbers (CAS-RN) include a final digit
as a "checksum" to test for validity (that is, that the number has not been
corrupted).
Usage
CAS.checksum(CAS.string)
Arguments
CAS.string
A character string of three numbers separated by two dashes
Details
The check digit (final number) is calculated by working from right to left,
starting with the second to last digit of the CAS-RN. We multiply each digit
by an increasing digit (1, 2, 3...) and sum as we work from right to left.
The check digit should equal the final digit of the sum.
Value
logical (TRUE if final digit of CAS is consistent with other digits)
Author(s)
John Wambaugh
httk documentation built on Sept. 11, 2024, 9:32 p.m.
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View source: R/add_chemtable.R
| CAS.checksum | R Documentation |
Test the check digit of a CAS number to confirm validity
Description
Chemical abstracts services registry numbers (CAS-RN) include a final digit as a "checksum" to test for validity (that is, that the number has not been corrupted).
Usage
CAS.checksum(CAS.string)
Arguments
CAS.string |
A character string of three numbers separated by two dashes |
Details
The check digit (final number) is calculated by working from right to left, starting with the second to last digit of the CAS-RN. We multiply each digit by an increasing digit (1, 2, 3...) and sum as we work from right to left. The check digit should equal the final digit of the sum.
Value
logical (TRUE if final digit of CAS is consistent with other digits)
Author(s)
John Wambaugh
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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