plotting a polynomial function
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mohammad
el 14 de Dic. de 2011
Editada: Walter Roberson
el 23 de Oct. de 2023
How can I plot a polynomial function in MATLAB? for example:
89.9659+0.1110371T-0.001472155T^2+ 1.1E-5T^3-4.381E-8T^4+1E-10T^5
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mohammad
el 18 de Jun. de 2012
Editada: Walter Roberson
el 23 de Oct. de 2023
3 comentarios
Morne' Breitenbach
el 5 de Jun. de 2020
Sorry not German or Dutch, my surname is Afrikaanse. so I presume you ment "look here", we write it as "Kyk heir"(said Cake Hirr(like the i in his with a pronounced roll of the r). So the zero means that our number set begins at zero and ends at 33.5, and we get from zero to 33.5 by adding incraments of 0.1? Is this correct?
Más respuestas (5)
Rubén Lumbiarres
el 13 de Sept. de 2018
Editada: Walter Roberson
el 15 de Sept. de 2018
x=-5:.1:5;
p=[1 -1 -11 9 18] % polynomial function
plot(x,polyval(p,x))
grid on
1 comentario
Brian Trease
el 24 de Nov. de 2020
Thanks!
I made it one step easier, with no need to specify spacing...
fplot(@(x) polyval(p,x), [-5 5])
grid on
Fangjun Jiang
el 14 de Dic. de 2011
Of course ezplot(), but you need to fix your formula.
ezplot('89.9659+0.1110371*T-0.001472155*T^2+ 1.1E-5*T^3-4.381E-8*T^4+1E-10*T^5')
Walter Roberson
el 14 de Dic. de 2011
Editada: Walter Roberson
el 23 de Oct. de 2023
You are asking to plot data that has a range of about 10^10 at one end, and about 10^20 at the other end. What are you expecting to see of interest?
T=linspace(100,1000,100);
p=89.9659+0.1110371*T-0.001472155*T.^2+ 1.1E-5*T.^3-4.381E-8*T.^4+1E-10*T.^5;
plot(T,p)
2 comentarios
Fangjun Jiang
el 14 de Dic. de 2011
No. Because you have small coefficients, the range of p is not from 10^2 to 10^20. The maximum value of p is around 7e4.
The point is, you can specify any range of T as you want, use linspace() or 100:100:1000, then use array power ".^" not the matrix power "^" to evaluate p, and then you can use plot().
Ch
el 4 de Sept. de 2022
x=-5:.1:5;
p=[1 -1 -11 9 18] % polynomial function
plot(x,polyval(p,x))
grid on
0 comentarios
Pink_panther
el 23 de Oct. de 2023
%solve1
fplot(@(x)89.9659+0.1110371.*x-0.001472155.*x.^2+1.1E-5.*x.^3-4.381E-8.*x.^4+1E-10.*x.^5)
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