subs: Substitute symbol for value

In caracas: Computer Algebra

Substitute symbol for value

Description

Substitute symbol for value

Usage

subs(sym, nms, vls)

Arguments

sym	Expression
nms	Names of symbols (see Details)
vls	Values that nms is substituted with (see Details)

Details

Two different ways to call this function is supported:

1. Supplying nms as a named list and omitting vls. If two components have the same name, the behaviour is undefined.

2. Supplying both nms and vls See Examples.

Examples

if (has_sympy()) {
   x <- symbol('x')
   e <- 2*x^2
   e
   subs(e, "x", "2")
   subs(e, x, 2)
   subs(e, list(x = 2))
   
   A <- matrix_sym(2, 2, "a")
   B <- matrix_sym(2, 2, "b")
   e <- A %*% A
   subs(e, A, B)
}

caracas documentation built on June 22, 2024, 10:59 a.m.