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I m trying to do something like this:

Plot3D[x[s1, s2], 
  {s2, (m3^2 + m^2)^2, (Sqrt[s] -  m^2)^2}, {s1,s1min[s2], s1max[s2]}, 
  RegionFunction -> Function[{x[s1, s2]}, -1 < x < 1]]

but without success.

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    – bbgodfrey
    Commented Mar 27, 2015 at 0:08
  • $\begingroup$ The plot limits for s1 and s2 have to be constants, and your syntax for Function is wrong. Try integrating the conditions on s1 into the RegionFunction, something like Function[{s1, s2, x}, -1 < x < 1 && s1min[s2] < s1 < s1max[s2]]. $\endgroup$
    – 2012rcampion
    Commented Mar 27, 2015 at 0:09
  • $\begingroup$ First of all, thks for the quick answer. So the problem is that s2 varies between numbers and s1 varies a function of s2. So what I wanna do is plot the fucntion x that I already defined before but only if its between -1 and 1...hope you understand what I mean $\endgroup$
    – meriem
    Commented Mar 27, 2015 at 0:13

1 Answer 1

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You can use ConditionalExpression using all the conditions that define the region you want to plot as the second argument:

ClearAll[x, m, m3, s1min, s1max]
x[s1_, s2_] := Sin[s1 + s2];
m = Sqrt[Pi/32];
m3 = Sqrt[Pi/64];
s1min[s_] := Sqrt@s;
s1max[s_] := 2 + Sqrt@s;

Plot3D[ConditionalExpression[x[s1, s2], 
   (m3^2 + m^2)^2 <= s2 <= (Sqrt[s1] - m^2)^2 && 
   s1min[s2] <= s1 <= s1max[s2] && -1 < x[s1, s2] < 1], 
 {s1, 0, Pi}, {s2, 0, Pi}, PlotPoints -> 100, MaxRecursion -> 4]

enter image description here

or, use RegionFunction

Plot3D[x[s1, s2], {s1, 0, Pi}, {s2, 0, Pi}, PlotPoints -> 100, MaxRecursion -> 4, 
 RegionFunction -> 
  Function[{s1, s2, z}, (m3^2 + m^2)^2 <= s2 <= (Sqrt[s1] - m^2)^2 && 
    s1min[s2] <= s1 <= s1max[s2] && -1 < z < 1]]
 (* same picture *)
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