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Question: How do I test a variable against itself for a value

Question:How do I test a variable against itself for a value

Christopher2222 5650
August 22 2011
0

How do I test a variable against itself to see if it has a value or not?

As an example

p1:=sin(x)
p2:=46

[seq(`if`(p||i=p||i,p||i,NULL),i=1..5)]  # when p||i actually equals p||i and not some value ie sequence should not include p3,p4 and p5

 
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