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已知符号函数 sgn x = 1 ...

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4      3      2      1  
sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

绝对值  符号值  整数值  小数值  
Sgn(Y-X)-Sgn(A-B)<0  Sgn(Y-X)-Sgn(A-B)=-2  Sg  Sgn  
5  -5  1  -1  
sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx

  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

sgn[g(x)]=sgnx  sgn[g(x)]=﹣sgnx  sgn[g(x)]=sgn[f(x)]  sgn[g(x)]=﹣sgn[f(x)]  

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