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pathologicalmore about pathological

pathological


  5  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Pathologic  \Path`o*log"ic\,  Pathological  \Path`o*log"ic*al\,  a. 
  (Med.) 
  Morbid;  due  to  disease;  abnormal;  as  pathological  tissue;  a 
  pathological  condition. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Pathologic  \Path`o*log"ic\,  Pathological  \Path`o*log"ic*al\,  a. 
  [Gr.  ?:  cf  F.  pathologique.] 
  Of  or  pertaining  to  pathology.  --  {Path`o*log"ic*al*ly},  adv 
 
  From  WordNet  r  1.6  [wn]: 
 
  pathological 
  adj  1:  of  or  relating  to  the  practice  of  pathology;  "pathological 
  laboratory"  [syn:  {pathologic}] 
  2:  caused  by  or  evidencing  a  mentally  disturbed  condition;  "a 
  pathological  liar";  "a  pathological  urge  to  succeed" 
  3:  caused  by  or  altered  by  or  manifesting  disease  or  pathology; 
  "diseased  tonsils";  "a  morbid  growth";  "pathologic 
  tissue";  "pathological  bodily  processes"  [syn:  {diseased}, 
  {morbid},  {pathologic}] 
 
  From  Jargon  File  (4.2.3,  23  NOV  2000)  [jargon]: 
 
  pathological  adj  1.  [scientific  computation]  Used  of  a  data 
  set  that  is  grossly  atypical  of  normal  expected  input,  esp.  one  that 
  exposes  a  weakness  or  bug  in  whatever  algorithm  one  is  using. 
  An  algorithm  that  can  be  broken  by  pathological  inputs  may  still  be 
  useful  if  such  inputs  are  very  unlikely  to  occur  in  practice.  2. 
  When  used  of  test  input,  implies  that  it  was  purposefully  engineered 
  as  a  worst  case.  The  implication  in  both  senses  is  that  the  data  is 
  spectacularly  ill-conditioned  or  that  someone  had  to  explicitly  set  out 
  to  break  the  algorithm  in  order  to  come  up  with  such  a  crazy  example. 
  3.  Also  said  of  an  unlikely  collection  of  circumstances.  "If  the  network 
  is  down  and  comes  up  halfway  through  the  execution  of  that  command  by 
  root,  the  system  may  just  crash."  "Yes,  but  that's  a  pathological  case." 
  Often  used  to  dismiss  the  case  from  discussion,  with  the  implication  that 
  the  consequences  are  acceptable,  since  they  will  happen  so  infrequently 
  (if  at  all)  that  it  doesn't  seem  worth  going  to  the  extra  trouble  to 
  handle  that  case  (see  sense  1). 
 
 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  pathological 
 
  1.  [scientific  computation]  Used  of  a  data  set  that  is  grossly 
  atypical  of  normal  expected  input,  especially  one  that  exposes 
  a  weakness  or  bug  in  whatever  algorithm  one  is  using.  An 
  algorithm  that  can  be  broken  by  pathological  inputs  may  still 
  be  useful  if  such  inputs  are  very  unlikely  to  occur  in 
  practice. 
 
  2.  When  used  of  test  input,  implies  that  it  was  purposefully 
  engineered  as  a  worst  case.  The  implication  in  both  senses  is 
  that  the  data  is  spectacularly  ill-conditioned  or  that  someone 
  had  to  explicitly  set  out  to  break  the  algorithm  in  order  to 
  come  up  with  such  a  crazy  example. 
 
  3.  Also  said  of  an  unlikely  collection  of  circumstances.  "If 
  the  network  is  down  and  comes  up  halfway  through  the  execution 
  of  that  command  by  root,  the  system  may  just  crash."  "Yes, 
  but  that's  a  pathological  case."  Often  used  to  dismiss  the 
  case  from  discussion,  with  the  implication  that  the 
  consequences  are  acceptable,  since  they  will  happen  so 
  infrequently  (if  at  all)  that  it  doesn't  seem  worth  going  to 
  the  extra  trouble  to  handle  that  case  (see  sense  1). 
 
  [{Jargon  File}] 
 
 




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