linear fit in Log Scale + extension
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Niklas Kurz
el 16 de Jun. de 2020
Comentada: Niklas Kurz
el 17 de Jun. de 2020
Hello, also this question might be trivial and frequently answered, but yet again I'm not able to grasp it. Long story short, that's what I got:
ind = f>=5000& f <= 10000
p = polyfit(f(ind),qU(ind),1);
t = polyval(p,(f(ind)));
plot(f(ind),t,'-r','Linewidth',3);
actually this looks like a straight line to me, even if I set:
set(gca,'XScale','log')
set(gca,'YScale','log')
However I want to extend this line, lets say to [5000 15000]. How can I finally achieve this? Thx in advance
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Respuesta aceptada
David Hill
el 16 de Jun. de 2020
Editada: David Hill
el 16 de Jun. de 2020
ind = f>=5000& f <= 10000
p = polyfit(f(ind),qU(ind),1);%you will always get a line if degree is 1
x=5000:15000;
t = polyval(p,x);
plot(x,t,'-r','Linewidth',3);
3 comentarios
David Hill
el 17 de Jun. de 2020
p1 = polyfit(f(1:2),qU(1:2),1);%however many points you want
p2 = polyfit(f(3:end),qU(3:end),1);%second line
x=5000:15000;
t1 = polyval(p1,x);
t2 = polyval(p2,x);
plot(x,t1,'-r',x,t2,'-g','Linewidth',3);
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