On 10/10/2013 2:39 PM, Ken Takagi wrote:
Hi,
I'm looking for an R function/package that will let me solve problems of the
type:
13 = 2^x + 3^x.
The answer to this example is x = 2, but I'm looking for solutions when x
isn't so easily determined. Looking around, it seems that there is no
algebraic solution for x, unless I'm mistaken. Does anyone know a good
package to solve these types of problems? Are there built in functions to do
this?
You can get approximate solutions using uniroot:
> uniroot(function(x) 2^x + 3^x - 13, c(0, 10))
$root
[1] 1.99998
$f.root
[1] -0.0002581592
$iter
[1] 10
$estim.prec
[1] 6.103516e-05
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