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F[k1_, k2_, λ1_, λ2_, δ_, w1_, w2_] := 
  (1 - Exp[-(w1/λ1)^k1])*(1 - Exp[-(w2/λ2)^k2])*
    Exp {[(1 - (1 - Exp[-(w1/λ1)^k1]))^-δ + (1 + (1 - Exp[-(w2/λ2)^k2]))^-δ]^(1/-δ)};

f[k1_, k2_, λ1_, λ2_, δ_, w1_, w2_] = D[F[k1, k2, λ1, λ2, δ, w1, w2], w1, w2];

Plot3D[f[2.3, 2.5, 6, 8, 0.001, x, y], {x, 0, 15}, {y, 0, 15}, 
  PlotPoints -> 100, PlotRange -> All]

Plot3D[f[2.3, 2.5, 6, 8, 1, x, y], {x, 0, 15}, {y, 0, 15}, 
  PlotPoints -> 100, PlotRange -> All]

Plot3D[f[2.3, 2.5, 6, 8, 10, x, y], {x, 0, 15}, {y, 0, 15}, 
  PlotPoints -> 100, PlotRange -> All]

I am trying run the code above. 1t gives an error message:

Syntax::tsntxi: "[(1-(1-Exp[-(w1/λ1)^k1]))^-δ+(1+(1-Exp[-(w2/λ2)^k2]))^-δ]" is incomplete; more input is needed.

I checked for a syntax error but there isn't any. Formula used is also correct, so what can be the problem?

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closed as off-topic by m_goldberg, Szabolcs, chuy, J. M. will be back soon Aug 12 '15 at 15:12

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." – m_goldberg, Szabolcs, chuy, J. M. will be back soon
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ "i checked for syntax error but there isn't." - did you carefully look at the syntax highlighting and notice any pink delimiters (parentheses, brackets)? $\endgroup$ – J. M. will be back soon Aug 12 '15 at 13:57
  • 1
    $\begingroup$ Your definition of F clearly has syntax errors. $\endgroup$ – m_goldberg Aug 12 '15 at 14:12
  • 1
    $\begingroup$ Square brackets are (to first order) strictly for function calls and for Part extraction when they appear in pairs. Curly brackets are strictly for Lists. $\endgroup$ – Patrick Stevens Aug 12 '15 at 14:27
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There was a wrong bracket in F. Also do not use { as a normal bracket, and second you wrote Exp{[ which has to be either {Exp[ or (Exp[ .

F[k1_, k2_, λ1_, λ2_, δ_, w1_, w2_] := 
  (1 - Exp[-(w1/λ1)^k1]) (1 - Exp[-(w2/λ2)^k2]) 
    (Exp[(1 - (1 - Exp[-(w1/λ1)^k1]))^(-δ) + (1 + (1 - Exp[-(w2/λ2)^k2]))^-δ]^(1/-δ))
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