How to fix the upper asymptote in sigmoid?
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Srilatha Raghavan
am 31 Jul. 2020
Kommentiert: Srilatha Raghavan
am 4 Aug. 2020
Hello, I have a sigmoid equation. My qestion is in a comment here:
The problem I am facing is, this sigmoid equation is a power curve and needs to reach a certain fixed height at the rated speed (variable 'a'). But I am not able to adjust my upper assymptode anything above 650, even by forcing my a to be an independent variable and also by replacing a by 900. Since, I am new to sigmoid, I would like some help to rewrite this piece of code to make my sigmoid reach 'a'. Also, I def need my xon, xoff and the everything about the curve from below to remain the same.
TIA
xon =3;
xrated = 12.5;
off=25;
a=900;
ft = fittype(@(b,c,x) mysigmoid(b,c,x,xon,xrated,a));
mdl = fit(x',y',ft,'start',[5 20]);
function yhat= mysigmoid(b,c,xon,xrated,a)
x= max(xon,min(x,xrated))
yhat = a./(1+exp(-(x-c)/b))- a./(1+exp(-(xon-c)/b));
end
0 Kommentare
Akzeptierte Antwort
Shae Morgan
am 31 Jul. 2020
Your call to mysigmoid has 6 input arguments (b,c,x,xon,xrated,a; the last of which is your "a"), but your defined function only accepts 5 (b,c,xon,xrated,a). you're missing the 'x' input argument in your function definition.
This is likely leading to your issues with manually setting the "height" of the sigmoid function.
4 Kommentare
Shae Morgan
am 3 Aug. 2020
your code still doesn't run after reading in these X and Y values. Please provide a code that will run so it can be used.
ex. missing 'b', 'c', and 'x' values.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Spline Postprocessing finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!