HOW DO I PLOT THIS GRAPH

Create a surface plot of the following function: Z = (4x^2+y^2+x-1)e^(-x^2-y^2)

the function z has 2 maximum points and 1 minimum point. Make sure your graph shows these 3 points clearly.

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/417158-mark-max-min-points-on-a-surface-plot

[Zeng Zhi Tee]

but there is error

[Zeng Zhi Tee]

@Walter Roberson can help me to write down the code?

[Zeng Zhi Tee]

who can help me!!

[Walter Roberson]

That other question already has most of the code. The rest you should develop on your own, following the direction I gave there. If you have specific questions about error messages or what the MATLAB function name is to do a particular operation, then you should ask about that.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[KALYAN ACHARJYA]

@Zeng Already Walter sir gave you the sufficient answer, now onwards learn by doing, not too much depends on "No learning just question posting".

[Zeng Zhi Tee]

This Correct?

[x,y]=meshgrid(-2:0.1:2,0:1);

z = (4.*x.^2 + y.^2 + x - 1).*exp((-x.^2) - (y.^2));

surf(x,y,z)

[Walter Roberson]

That looks okay.

I tend to suggest

surf(x, y, z, 'edgecolor', 'none')

to prevent the black edges from being drawn. The black edges are constant thickness, and can easily hide the graph itself when you plot more densely.

Notice by the way that you are only using two distinct points in y, since 0:1 is the same as [0 1] . Perhaps you were thinking of something like 0:.1:1