# [R] Solve equality function with GA

Bert Gunter bgunter@4567 @end|ng |rom gm@||@com
Sun Sep 25 17:11:16 CEST 2022

```... oops. Ignore my last sentence. Need more coffee...
-- Bert

On Sun, Sep 25, 2022 at 7:45 AM Bert Gunter <bgunter.4567 using gmail.com> wrote:

> ... and so you need f(x) = abs(x^2 - 25),
> though I have no idea if GA handles non-continuously differentiable
> functions.
>
> -- Bert
>
> On Sun, Sep 25, 2022 at 1:44 AM Eric Berger <ericjberger using gmail.com> wrote:
>
>> ?ga states that ga() searches for the maximum of the fitness function.
>> The maximum of your fitness function is at x=0.
>>
>>
>>
>> On Sun, Sep 25, 2022 at 4:52 AM Bert Gunter <bgunter.4567 using gmail.com>
>> wrote:
>>
>>> We aren't supposed to do homework on this list.
>>>
>>> Bert Gunter
>>>
>>> On Sat, Sep 24, 2022 at 5:29 PM Barry King via R-help <
>>> r-help using r-project.org>
>>> wrote:
>>>
>>> > I am having difficulty solving for 5 in this coded snippet. Please
>>> help.
>>> > -------------------
>>> > library(GA)
>>> >
>>> > # Solve for x where x^2 = 25, not x^2 <= 25
>>> >
>>> > f <- function(x)
>>> > {
>>> >   x^2-25
>>> > }
>>> >
>>> > fitness <- function(x) -f(x)
>>> >
>>> > GA <- GA <- ga(type = "real-valued", fitness = fitness, lower = 0,
>>> upper =
>>> > 10)
>>> > summary(GA)
>>> > -------------------------
>>> > Thank you,
>>> > Barry King
>>> >
>>> > --
>>> >
>>> >
>>> >
>>> >
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