IndexOf 指令

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IndexOf[ <Object>, <List> ]
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IndexOf[ <Object>, <List>, <Start Index> ]
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IndexOf[ <Text>, <Text>]
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IndexOf[ <Text>, <Text>, <Start Index> ]
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IndexOf[ <Object>, <List> ]
Returns position of first occurrence of Object in List, e.g. IndexOf[5,{1,3,5,2,5,4}] returns 3. When the object is not found, result is undefined.
IndexOf[ <Object>, <List>, <Start Index> ]
Same as above, but the search starts at given index.
范例:
  • IndexOf[5,{1,3,5,2,5,4},3] returns 3.
  • IndexOf[5,{1,3,5,2,5,4},4] returns 5.
  • IndexOf[5,{1,3,5,2,5,4},6] returns undefined.
IndexOf[ <Text Needle>, <Text Haystack>]
Returns position of first occurrence of Needle in Haystack, e.g. IndexOf["Ge","GeoGebra"] returns 1.
IndexOf[ <Text Needle>, <Text Haystack>, <Start Index> ]
Same as above, but the search starts at given index.
范例: IndexOf["Ge","GeoGebra",2] returns 4.
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