I can't graph multivariable function that contains cos function doens't work
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I'm trying to graph f(x,y)=(e^x )* cos(y)
By using ulframalpha, I found that the graph should look like this.
>> x=[-4*pi:0.1:4*pi];
>> y=[-4*pi:0.1:4*pi];
>> [X,Y]=meshgrid(x,y);
>> Z=exp(X)*cos(Y);
>> surf(X,Y,Z)
My code look like this, and the result keep shows me this, flat plane.
I changed range for several times, but I don't think that range is not problem.
Can you see any problem in my code?
Any help would be aprreciated.
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Accepted Answer
Walter Roberson
on 28 Oct 2020
Z=exp(X).*cos(Y);
Remember that the * operator is matrix multiplication (inner product). Multiplication of corresponding elements requires the .* operator.
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