[R] R solve equation
rafamoral
rafa_moral2004 at yahoo.com.br
Sun Feb 8 23:05:11 CET 2009
If you are looking for a solution to a polynomial equation with imaginary
solutions you could use polyroot().
Example:
To solve the equation: 1 + x + x^3 + 2*x^4 = 0
you create a vector with the coefficients of x and use polyroot:
z <- matrix(c(1,1,0,1,2), ncol=1)
polyroot(z)
Also try ?polyroot
Rafael
Paul Smith wrote:
>
> On Sat, Feb 7, 2009 at 10:20 AM, oryie <43248523 at qq.com> wrote:
>> I want to use R to calculate the variable x which is in some eqation,
>> give
>> an example:
>>
>> 3*x-log(x)+1=0,
>>
>> how to solve equation to get the exact x in R?
>
> You could use uniroot(), but your equation has no real solution.
>
> Paul
>
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