2
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t1 ={0, 1, 2, Log[6]/Log[2], 3, Log[12]/Log[2], 4, Log[24]/Log[2]}

I want to get the Position of the Integers. I can do it by

Flatten[Position[Length /@ t1, 0]]

to get the result {1,2,3,5,7}. How would I use IntegerQ here to get the same result?

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    $\begingroup$ Use Position[t1, <pattern>, 1] and find some way to use IntegerQ in a pattern (spoiler). $\endgroup$
    – Jason B.
    Mar 18 at 15:51
4
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Note that

IntegerQ/@t1

gives a vector consisting if Trues and Falses. So you want the Positions of all those that have True:

Flatten@Position[IntegerQ /@ t1, True]
{1,2,3,5,7}
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  • 1
    $\begingroup$ Also Flatten@Position[t1, _Integer, 1] $\endgroup$
    – Bob Hanlon
    Mar 18 at 22:05

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