Problem with Legend command.
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syms x
f=log(x);
hold on
T1=taylor(f,'Expansionpoint',2,'order',1)
T2=taylor(f,'Expansionpoint',2,'order',2)
T3=taylor(f,'Expansionpoint',2,'order',3)
T4=taylor(f,'Expansionpoint',2,'order',4)
x=-5:.1:5;
xx=subs(x);
yy1=subs(T1);
plot(xx,yy1,'m');
yy2=subs(T2);
plot(xx,yy2,'r');
yy3=subs(T3);
plot(xx,yy3,'c');
yy4=subs(T4);
plot(xx,yy4,'b');
legend('po(x)','p1(x)','p2(x)','p3(x)')
xlabel('x');
ylabel('y');
grid on
The problem is very silly and i think i am missing something elementary.Why the legend command not giving different colors to the p0,p1,p2,p3 in the image.Any help will be appreciated.
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Réponses (1)
Star Strider
le 15 Déc 2017
Modifié(e) : Star Strider
le 15 Déc 2017
The problem is the first plot call.
Change it to:
fplot(yy1,[-5 5],'m');
and everything else works.
EDIT —
Also, the ‘xx’ assignment is not necessary. Simply delete it and use ‘x’ instead in the rest, or use fplot for the rest, as with the first one.
2 commentaires
Walter Roberson
le 16 Déc 2017
The first couple of versions that had fplot did not support symbolic variables. You might be using an older release. If so then instead of passing yy to fplot, call matlabFunction on yy and pass the result to fplot
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