Note that the C library had to be patched to get this working; a new version of the library will address the bug directly.
gsw_IPV_vs_fNsquared_ratio(SA, CT, p, p_ref = 0)
Absolute Salinity [ g/kg ]
Conservative Temperature [ degC ]
sea pressure [dbar], i.e. absolute pressure [dbar] minus 10.1325 dbar
reference pressure [ dbar ]
list containing IPV_vs_fNsquared_ratio [ unitless ] and mid-point pressure p_mid [ dbar ]
This R function uses a wrapper to a C function
contained within the GSW-C system as updated 2021-03-27
with git commit 'f7bfebf44f686034636facb09852f1d5760c27f5'.
In turn, that C function uses data from the
file provided in the GSW-Matlab source code, version 3.06-11.
Unfortunately, this version is no longer displayed on the
TEOS-10.org website. Therefore, in the interests of making
GSW-R be self-contained, a copy was downloaded from
on 2021-0706, the .mat file was stored in
the developer/create_data directory of
https://github.com/TEOS-10/GSW-R, and then the dataset
used in GSW-R was created based on that .mat file.
Please consult http://www.teos-10.org to learn more about
the various TEOS-10 software systems.
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SA <- c(34.7118, 34.8915, 35.0256, 34.8472, 34.7366, 34.7324) CT <- c(28.8099, 28.4392, 22.7862, 10.2262, 6.8272, 4.3236) p <- c( 10, 50, 125, 250, 600, 1000) p_ref <- 0 r <- gsw_IPV_vs_fNsquared_ratio(SA, CT, p, p_ref) stopifnot(all.equal(r$IPV_vs_fNsquared_ratio, c(0.999742244888022, 0.996939883468178, 0.986141997098021, 0.931595598713477, 0.861224354872028))) stopifnot(all.equal(r$p_mid, c(30, 87.5, 187.5, 425, 800)))
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