Hello,

It is just a guess but I bet that what the OP means is


f <- function(x) {
  2 + x^2 - x^3
}

uniroot(f, lower = 1, upper = 2)


To the OP: please learn how to write math in R *before* trying to solve problems.

Hope this helps,

Rui Barradas


Às 16:07 de 02/02/2019, Berend Hasselman escreveu:


On 1 Feb 2019, at 12:41, malika yassa via R-help <r-help@r-project.org> wrote:

Please, can you help me I have a equation to solve by newton method but I can 
not do it
for example

f<-function(x) {


2+X2-X3=0}
this equation have un solution in [1,2]
is there a function in R for solve it or i have to programme it


What is the relation between the function argument x and variables X2 and X3?

As it stands this is incomprehensible. The function argument x is not used 
anywhere in the function body.

Berend Hasselman




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