Create Term Vector

Creates a term vector from values. A term vector is an S3 vector of parameter terms of the form p, q[#] or r[#,#] where # are positive integers. This function checks that all terms are valid but does not require stronger levels of consistency, see chk_valid() for details.

term(...)

Arguments

...

Unnamed values are term values, named values describe the parameter in the name and the dimensionality in the value.

Value

A term vector.

See also

dims(), ndims(), npdims() and pdims()

Other term: term_rcrd(), tindex()

Examples

term()
#> <term[0]>
term("p", "q[1]", "q[2]", "q[3]")
#> <term[4]>
#> [1] p    q[1] q[2] q[3]
term("q[1]", "q[2]", "q[3]")
#> <term[3]>
#> [1] q[1] q[2] q[3]
combined <- term(par = 2:4, "alpha")
pdims(combined)
#> $alpha
#> [1] 1
#> 
#> $par
#> [1] 2 3 4
#> 
term(!!!pdims(combined))
#> <term[25]>
#>  [1] alpha      par[1,1,1] par[2,1,1] par[1,2,1] par[2,2,1] par[1,3,1]
#>  [7] par[2,3,1] par[1,1,2] par[2,1,2] par[1,2,2] par[2,2,2] par[1,3,2]
#> [13] par[2,3,2] par[1,1,3] par[2,1,3] par[1,2,3] par[2,2,3] par[1,3,3]
#> [19] par[2,3,3] par[1,1,4] par[2,1,4] par[1,2,4] par[2,2,4] par[1,3,4]
#> [25] par[2,3,4]

# Invalid terms are rejected:
try(term("r["))
#> Error in term_impl(args) : 
#>   All elements of term vector `string_args_term` must be valid.

# Valid terms are repaired
term("r  [ 1  ,2  ]")
#> <term[1]>
#> [1] r[1,2]