draw a plot-graph

how can i draw a graph from this equation:F(n) = x2^3 − 3x1^2 + x3 ?

Can anyone explain?

[KSSV]

Define x2, x1, x3....what should be there range?

[andreas kaffas]

thank you....there was a problem with the exercise and teachers uploaded another file in which the variables are defined!!

Answer 1

[madhan ravi]

doc fimplicit3

[Walter Roberson]

This would be suitable if F(n) is some constant, such as if the equation is

[andreas kaffas]

thank you....there was a problem with the exercise and teachers uploaded another file in which the variables are defined!!

Answer 2

[Walter Roberson]

If F(n) is not a constant, then you have the problem that you have three independent variables and one dependent variable. That would require 4 dimensional plots.

The closest you can get to 4 dimensional plots is to use isosurface() or slice() .

For example:

Fn = @(x1, x2, x3) x1.^2 - 2*x2.^3 + 3*x3/5 + 4;
[X1, X2, X3] = meshgrid(linspace(-2,2,25));
Z = Fn(X1, X2, X3);
for level = -13:5:25; isosurface(X1, X2, X3, Z, level); end

[andreas kaffas]

thank you....there was a problem with the exercise and teachers uploaded another file in which the variables are defined!!