A step of the cgnonl_native implementation. Called by .cgnonl_beta.
See the file header for the source the module follows.
Usage
cgnonl_beta_polak_ribiere(g_new, g_old, plus = FALSE)
Arguments
- g_new
Numeric; combined arithmetically in the body.
- g_old
Numeric; combined arithmetically in the body.
- plus
A flag; the body branches on it. Defaults to FALSE.
Value
One of two values, depending on the branch taken.
Examples
cgnonl_beta_polak_ribiere(g_new = c(0.5, -0.2), g_old = c(1, 0.3))
#> [1] -0.1376147
cgnonl_beta_polak_ribiere(g_new = c(0.5, -0.2), g_old = c(1, 0.3), plus = TRUE)
#> [1] 0
