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f[K[1] _, K[2] _, K[3] _] := 
 32 b^9 + 4 b^3 Cosh[b/2] K[1] K[2] - 4 b^3 Cosh[b/2] K[1] K[3]
f[10,10,10]

I have an equation which is a function of K[1], K[2] and K[3]. But when I have to try to evaluate at f[10,10,10]. But it is not evaluating. I don't understand what is the error. And moreover it not showing any warning and error.

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No, it is not possible. Just write

 f[K1_, K2_, K3_] := 32 b^9 + 4 b^3 Cosh[b/2] K1 K2 - 4 b^3 Cosh[b/2] K1 K3
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  • $\begingroup$ actually, I have written a small function from where the K1, K2, and K3 are coming. In that function I have used Table[K[i],{i,1,3}]. If I can able to express this then it would be very useful. Are there any ways to execute this? $\endgroup$
    – acoustics
    Commented Nov 23, 2018 at 9:46
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    $\begingroup$ You could do K[x_] := Symbol["K" <> ToString[x]]. $\endgroup$
    – Rolf Mertig
    Commented Nov 23, 2018 at 10:31

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