Improving fit of custom function

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Romio
Romio on 10 Aug 2020
Commented: Rena Berman on 12 Oct 2020
Hello,
I have the following curve.
I want to fit it into a closed-form equation. I tried to use GRABIT to get a vector of values that could plot it.
x = [0.0194119350975558 0.248031785422458 0.291351961297183 0.334455968629621 0.397706884103397 0.439513880182100 0.459876956865727 0.644744294231326 0.658622314646282 0.755249653049490 0.832378588938224 0.889360616685617 0.929005927341429 0.970164417793265 0.990095157392316 1.05248139869694 1.11508380854384 1.20042714903956 1.24439583054116 1.26670442410539 1.33211702500205 1.40033981694848 1.46964345160635 1.56039100565929 1.58464511610412 1.60738604675293 1.67279864764960 1.73734657437711 1.84391766572561 1.92839633205217 1.99143107898366 2.07482890259878 2.26069061525890 2.34387227033173 2.42813476811600 2.53492202800680 2.62113004267167 2.70712188879425 2.73029515652764 2.81693550827709 2.88234810917376 2.98956770614913 3.07491104664485 3.18169830653564 3.28783706079956 3.47910298701692 9.89096458726940]
y = [0.382895015585752 0.936494005646322 0.944570062386241 0.950609811457797 0.946433435220773 0.940255338282152 0.932075520641934 0.473525838625860 0.404256790934756 0.314486318692959 0.241040894764830 0.177811596145283 0.151270422523033 0.138983402579323 0.126730969602380 0.114409362691904 0.104124063449791 0.108058330919451 0.122243310664459 0.132390262039507 0.148576962486111 0.191235662621433 0.244075901098568 0.298917860277301 0.327391580667615 0.341611147379389 0.357797847825993 0.365839317599146 0.369738998102040 0.365528034898250 0.359315350992862 0.344922849447257 0.295740182705652 0.279311373491684 0.273064102619530 0.279000090790788 0.291079588933900 0.301122779408649 0.319414961457149 0.335567074936987 0.351753775383591 0.361762378891574 0.365696646361235 0.371632634532492 0.371459699698661 0.373184724666128 0.372920999044535]
However, I am trying to fit that into an equation, whatever it is. Is that possible? If so, how can I do that
Thanks,
  8 Comments
Rena Berman
Rena Berman on 12 Oct 2020
(Answers Dev) Restored edit

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Answers (1)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 10 Aug 2020
Hi,
Why not to use cftool (Curve Fitting Toolbox).
  1. Launch it with: >> cftool
  2. Indicate your x data and y data variable names in GUI window of cftool
  3. Select the available fit models or enter your custom equation
Good luck.
  1 Comment
Romio
Romio on 10 Aug 2020
Thanks. I just downloaded it :)

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