Plot will not show lines

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Christina Allen
Christina Allen 2021-3-2
评论： KSSV 2021-3-2
I'm trying to show multiple lines on a graph but the lines do not show up on the figure.
x = [-0.923 : 0.01 : -0.633] ;
for n = 1 : 1 : length(x)
f(n) = 16*x(n)^3 - 13*x(n)^2 + 12*x(n) + 15
g(n) = -7*x(n)^3 - 6*x(n)^2 + 4*x(n) - 6
end
plot(x,f(n), x,g(n))
ylabel('f(x) and g(x)')
xlabel('x values')
  1 个评论
KSSV
KSSV 2021-3-2
  1. Read about element by element operations.
  2. You are plotting only one point i.e n = length(x).
  3. You have not initalized f, g

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KSSV
KSSV 2021-3-2
编辑：KSSV 2021-3-2
Ran in:
x = -0.923 : 0.01 : -0.633 ;
f = 16*x.^3 - 13*x.^2 + 12*x + 15 ;
g = -7*x.^3 - 6*x.^2 + 4*x - 6 ;
plot(x,f, x,g)
ylabel('f(x) and g(x)')
xlabel('x values')
  2 个评论
Christina Allen
Christina Allen 2021-3-2
thank you!! I needed to label the vertical components of my plot as f and g, instead f(n) and g(n).
KSSV
KSSV 2021-3-2
Read about label and legend.

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