How about this:
library(rootSolve)
f1<-function(x)5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
uniroot.all( f1,c(-1e6,1e6))
[1] -1.9881665 0.0363435
Cheers
Am 20.11.2018 um 13:09 schrieb Engin Yılmaz:
Dea(R)
I try to solve one equation but this program did not give me real roots
for example
yacas("Solve( 5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
==0, x)")
gave me following results
How can I find real roots?
expression(list(x == complex_cartesian((1/42 - ((1/63 -
((root(7339451281/3087580356,
2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
2))^(1/3) - 1/63)^2/4 + 1, 2)))/2 - 1, root(4 *
(((root(7339451281/3087580356,
2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
2))^(1/3) - 1/63)/2 + root(((root(7339451281/3087580356,
2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
2))^(1/3) - 1/63)^2/4 + 1, 2)) - (((1/63 -
((root(7339451281/3087580356,
2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
2))^(1/3) - 1/63)^2/4 + 1, 2)) - 1/42)^2, 2)/2),...more
Engin Yılmaz <ispanyol...@gmail.com>, 20 Kas 2018 Sal, 12:53 tarihinde şunu
yazdı:
Thanks a lot!
Berend Hasselman <b...@xs4all.nl>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
yazdı:
R package Ryacas may be what you want.
Berend
On 20 Nov 2018, at 09:42, Engin Yılmaz <ispanyol...@gmail.com> wrote:
Dea(R)
Do you know any system solver in R ?
For example, in matlab, is very easy
syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
How can I find this type code in R (or directly solver)?
*Since(R)ely*
Engin YILMAZ
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Engin YILMAZ
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