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plotting quadratic equation and curve fittting

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Avinash Tallapaneni
Avinash Tallapaneni 2016-12-13
评论： Star Strider 2023-6-5
im kinda of struck how to plot quadratic function for different x and y values.the equation is (x^25)+(y^3)-(6*x^24*y) for different values of x =[-10,10] and y=[-10,10] and do a polyfit for the obtained point

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Star Strider
Star Strider 2016-12-13
The plot is straightforward:
fcn = @(x,y) (x.^25)+(y.^3)-(6*x.^24.*y);
[X,Y] = meshgrid(-10:0.5:10);
figure(1)
meshc(X, Y, fcn(X,Y))
grid on
xlabel('X')
ylabel('Y')
I do not know the reason you would want to fit this with polyfit. You already have the equation for the surface.
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M
M 2023-6-5
A quite good. but cammand for equation, F(x) = x^3+ 2x+1
Star Strider
Star Strider 2023-6-5
@M — Your function is not appropriate for this code, since it has only one variable and this code requires functions with two variables.

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