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shaq_1241 (16)

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A signum function is one which is defined as follows:
 
f(x) = |x|/x  for  x not equal to 0
     =  0 for x = 0 
 
it range lies within {0,1,-1) .It therefore returns 0 for 0  input,1 for +ne nos. and -1 for -ve nos.
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