Undefined function or variable 'e'

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.

[Stephen23]

"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]

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?

Answer 1

[Torsten]

@(x,y)exp(-(x.^2 +y.^2)).* (x.^2 +y.^2)

instead of

@(x,y)e^(-x.^2-y.^2)*(x.^2+y.^2)

[PSSHDA]

Thanks Torsten this works for me... Thank You very much