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Causal Systems

  • Thread starter Natalie89
  • Start date
  • #1
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Homework Statement



Determine if y(n)=a^(|n|) is causal


Homework Equations



A system is causal if the output taken at anytime depends only on present and past inputs.

The Attempt at a Solution



I think the system is causal because the exponent, |n|, would represent a present value of 'n', but would this be the case when taking the magnitude of a value?
 

Answers and Replies

  • #2
What if n=-2 ? |-2|=2 .

Thus,the system at n=-2 depends on a future value.
 
  • #3
29
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Thank you!
 

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