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m[x_, y_] := 
 0.9*Exp[-((x - 1)^2 + (y - 1)^2)] + 
  0.5 Exp[-(3^2 ((x - 2.5)^2 + (y - 1.5)^2))]

I'm trying to create a 3d plot for the function above. I tried Plot3D, but all i got was a blank. my plot attempt : Plot3D[m, {x, -1, 1}, {y, -1, 1}]

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closed as off-topic by Nasser, Rahul, Michael E2, bobthechemist, m_goldberg Jul 6 at 3:30

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – Nasser, Rahul, Michael E2, bobthechemist, m_goldberg
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You can't just write Plot3D[m,...] you have to actually call m with the arguments. Try m[x,y] –  Nasser Jul 6 at 1:21
oh and i made a mistake, the domain is x= 0 to 5, y = 0 to 5 –  Lebouski Jul 6 at 1:22
Ok, you can try Plot3D[m[x, y], {x, 0, 5}, {y, 0, 5}, PlotRange -> All] and see if this works –  Nasser Jul 6 at 1:23
It does! sorry I'm not too familiar with mathematica. thanks for the quick reply. –  Lebouski Jul 6 at 1:25
I was going to down-vote this since it would seem to be a very simple error that would be avoided by just looking at the documentation for Plot3D. Turns out, though, that it's not so easy to find an example in the documentation like this, where first one defines the function of two variables and then plots it. (The first example there of this kind is, in fact, much more complicated: NDSolve[{D[u[t, x], t] == D[u[t, x], x, x], u[0, x] == 0, u[t, 0] == Sin[t], u[t, 5] == 0}, u, {t, 0, 10}, {x, 0, 5}] followed by what is essentially Plot3D[Evaluate[u[t, x] /. %], {t, 0, 10}, {x, 0, 5}]. –  murray Jul 6 at 3:02

1 Answer 1

up vote 1 down vote accepted

you don't need to use m[x_,y_]:= simply as follow:

m = 0.9*Exp[-((x - 1)^2 + (y - 1)^2)] + 
   0.5 Exp[-(3^2 ((x - 2.5)^2 + (y - 1.5)^2))];
Plot3D[m,{x, 0, 5}, {y, 0, 5}, PlotRange -> All]
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