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  • $\begingroup$ thank you very much for helping me. I already run it but how can I do if I want to substitute the list {-3,0,1,2} as A not the list.? $\endgroup$ Commented Aug 5, 2016 at 13:56
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    $\begingroup$ @munirah I may misunderstand but I think you mean simply A = {-3, 0, 1, 2} and then on another line -Total[#*pLog2[#] & @ A], or just -Total[A*pLog2[A]]. By the way it is best not to start user Symbol names (like A) with capital letters, as these may conflict with built-ins, e.g. C, D, E, I, N` are all existing reserved Symbols. $\endgroup$ Commented Aug 5, 2016 at 19:05
  • $\begingroup$ It mean when I want to make any, it better for me use small letter?Here, I try to replace the symbol A instead the list {-3, 0, 1, 2} since the list can be variety. hence, I do like this : -Total[#*pLog2[#] & @ A] but iit come error $\endgroup$ Commented Aug 7, 2016 at 0:32
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    $\begingroup$ @munirah: in short, always use a instead of A, c instead of C, etc. as your variables. $\endgroup$ Commented Aug 7, 2016 at 1:13