Question: help in plotting graph

y am not able to excutes these simple steps. What does this error means Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct



``

restart

 

with(plots):

 

``

u := proc (x, t) options operator, arrow; exp^(-Pi^2*t)*cos(`πx`) end proc

 

plot3d(u(x, t), x = 0 .. 1, t = 0 .. 0.5e-1)

 

 

 

 

``



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