Undefined function or variable 'e'

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PSSHDA
PSSHDA 2023-2-9
评论： PSSHDA 2023-2-9
I am writing a code to convert 3D plot in to 2D plot for the given function. The code is as below
f=input('Enter any function in x and y f(x,y)=');
[x,y]=meshgrid (-10:0.5:10,-10:0.5:10);
figure
surf(x,y,f(x,y))
xlim([-11,11])
ylim([-11,11])
figure
surf(x,y,f(x,y))
view(90,0), shading interp
xlabel X, ylabel Y, zlabel Z
The code is sucessfully displays the results for @(x,y) sin(x.^2 + y.^2) & @(x,y) cos(x.^2 )*( y.^2), But for input like @(x,y)e^(-x.^2-y.^2)*(x.^2+y.^2) (I wish to check plots for exp(-x^2 -y^2) (x^2 +y^2)), it shows the error like "Undefined function or variable 'e'"
Please help me to sort out the error.
  2 个评论
Stephen23
Stephen23 2023-2-9
"Please help me to sort out the error."
Either define e or use the EXP() function:
https://www.mathworks.com/help/matlab/ref/exp.html
PSSHDA
PSSHDA 2023-2-9
Thanks @Stephen23 I have added function like this..
function e =exp(x,y)
f=input('Enter any function in x and y f(x,y)=');
[x,y]=meshgrid (-10:0.5:10,-10:0.5:10);
figure
surf(x,y,f(x,y))
xlim([-11,11])
ylim([-11,11])
figure
surf(x,y,f(x,y))
view(90,0), shading interp
xlabel X, ylabel Y, zlabel Z
still the result is same. though the plot windows is opened but no plot is there...Am I doing right?

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采纳的回答

Torsten
Torsten 2023-2-9
@(x,y)exp(-(x.^2 +y.^2)).* (x.^2 +y.^2)
instead of
@(x,y)e^(-x.^2-y.^2)*(x.^2+y.^2)

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