Displaying 2 results from an estimated 2 matches for "par_nam".
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par_name
2009 Feb 09
2
how to get form parameters while using fields_for with nested attributes
...ny :addresses
although the form is displaying fine, but on submitting it the following
error is shown:
*can''t convert HashWithIndifferentAccess into Array*
on this line:
*@partner = Partner.new(params[:partner])*
the names of main ''partner'' fields are like:
*partner[par_name]*
the names of ''address'' fields are like:
*partner[addresses][add_line_1]*
*some code:*
<% form_for(@partner) do |f| %>
<%= f.error_messages %>
<%= f.label :par_name, "Partner Name" %><br />
<%= f.text_field :par_name %>
&l...
2018 Jun 22
0
bug in 'optim' documentation : "Brent" method doesn't copy 'par' names
...on (x) x^2 + x
> par <- -0.75
> x <- optim(par = par, method = "Brent", lower = -1, upper = 0, fn = quad)
> x$par
[1] -0.5
> x$value
[1] -0.25
However, if the fn argument relies in the names in par, this optimum might not be achieved, e.g.,
> names(par) <- "par_name"
> par
par_name
-0.75
> named <- function (x) if (length(names(x)) > 0) quad(x) else 123.456
> y <- optim(par = par, method = "Brent", lower = -1, upper = 0, fn = named)
> y$par
[1] -6.474096e-09
> y$value
[1] 123.456
The y$value suggests that the names...