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i'm new in wolfram-mathematica and I wanna know if is there a way to know if a function is already defined. I mean. Is there something likeSomeFunction[f[i,j+1]] that returns True or False?

I've been trying with ValueQ function but, it apparently doesn't work for that kind of arguments, j+1.

Thanks in advance.

joar va
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  • you can evaluate `?f` – agentp Nov 11 '17 at 13:23
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    seek [checking-if-a-symbol-is-defined](https://stackoverflow.com/questions/4599241/checking-if-a-symbol-is-defined) – Nasser Nov 12 '17 at 04:44
  • Possible duplicate of [Checking if a symbol is defined](https://stackoverflow.com/questions/4599241/checking-if-a-symbol-is-defined) – Mike Pierce Nov 13 '17 at 16:04
  • Hi, many thanks by reply. Well, i was expecting that `ValueQ` would help me, but when i use `ValueQ[f[j,k+1]]` it returns `True` even when `f[j,k]` is not defined. So, it did not work as i wanted. – joar va Nov 15 '17 at 16:46

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