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nexus [2007/12/12 10:41] – heidinexus [2008/07/22 13:31] (current) – external edit 127.0.0.1
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 ===== format information ===== ===== format information =====
 standard text file standard text file
 +
 +
 +
  
  
 ===== file format: ===== ===== file format: =====
 +  * NEXUS files are free-format, which means that the entire file could conceivably consist of a single, long line of text. It does not matter to Hickory where you break lines (as long as you don’t split up a keyword or the name of a locus, allele or population), nor does it matter if you use one space or a dozen spaces to separate the individual words (tokens) in the file. Tokens may be casually defined as sequences of characters separated by whitespace (e.g., spaces, carriage returns, line feeds, tabs, etc.)
 +  * NEXUS files are for the most part not case-sensitive by default. A big exception is in the matrix command, where (by default) an allele named A is treated as being distinct from a
 +
 +\\
   * Comments can be added by enclosing text with brackets: ''[comment]''   * Comments can be added by enclosing text with brackets: ''[comment]''
   * first line must be: ''#NEXUS''   * first line must be: ''#NEXUS''
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     * Blocks: series of commands, beginning with a BEGIN command and ending with an END command: <code>     * Blocks: series of commands, beginning with a BEGIN command and ending with an END command: <code>
 BEGIN block-name; BEGIN block-name;
-command-name token . . . ; + command-name token . . . ; 
-command-name token . . . ; + command-name token . . . ; 
-...+ ...
 END; END;
 </code> </code>
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   * **TAXA:** TAXA block defines taxa and gives them names. The block also establishes the order (numbering) of the taxa. Taxa consist of the entities (biological species, haplotypes, manuscripts, etc.) whose attributes might be recorded in characters and whose relationships are described in trees <code>   * **TAXA:** TAXA block defines taxa and gives them names. The block also establishes the order (numbering) of the taxa. Taxa consist of the entities (biological species, haplotypes, manuscripts, etc.) whose attributes might be recorded in characters and whose relationships are described in trees <code>
 BEGIN TAXA; BEGIN TAXA;
-DIMENSIONS NTAX=number-of-taxa; + DIMENSIONS NTAX=number-of-taxa; 
-TAXLABELS taxon-name [taxon-name ...] ;+ TAXLABELS taxon-name [taxon-name ...] ;
 END; END;
 </code> </code>
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   [TRANSPOSE]   [TRANSPOSE]
   [INTERLEAVE]   [INTERLEAVE]
-  [ITEMS=([MIN][MAX][MEDIAN][AVERAGE][VARIANCE][STCERROR][SAMPLESIZE][STATES])]        default: STATES +  [ITEMS=([MIN][MAX][MEDIAN][AVERAGE][VARIANCE][STCERROR][SAMPLESIZE][STATES])]  default: STATES 
-  [STATESFORMAT={STATESPRESENT|INDIVIDUALS|COUNT|FREQUENCY}]                           default: STATESPERSENT+  [STATESFORMAT={STATESPRESENT|INDIVIDUALS|COUNT|FREQUENCY}]                     default: STATESPERSENT
   [[No]TOKENS]   [[No]TOKENS]
  ;]  ;]
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  ;]  ;]
  MATRIX data-matrix;  MATRIX data-matrix;
 +END;
 +</code> example: <code>
 +BEGIN CHARACTERS;
 + DIMENSION NCHAR=3;
 + CHARSTATELABELS 1 hair/absent present, 2 color/red blue, 3 size/small big;
 + FORMAT TOKENS;
 + MATRIX
 +  taxon_1 absent red big
 +  taxon_2 absent blue small
 +  taxon_3 present blue small;
 END; END;
 </code> </code>
  
-  * UNALIGNED: similar to a CHARACTRS block, but it contains unaligned molecular sequence data. <code>+  * **UNALIGNED:** similar to a CHARACTRS block, but it contains unaligned molecular sequence data. <code>
 BEGIN UNALIGNED; BEGIN UNALIGNED;
  [DIMENSIONS NEWTAXA NTAX=number-of-taxa;]  [DIMENSIONS NEWTAXA NTAX=number-of-taxa;]
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 </code> </code>
  
-  * DISTANCES: contains distance matrices <code>+  * **DISTANCES:** contains distance matrices <code>
 BEGIN DISTANCES; BEGIN DISTANCES;
  [DIMENSIONS [NEWTAXA] NTAX=number-of-taxa NCHAR=number-of-characters;]  [DIMENSIONS [NEWTAXA] NTAX=number-of-taxa NCHAR=number-of-characters;]
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 </code> </code>
  
-  * DATA: is a CHARACTERS block that includes not only the definition of characters but also the definition of taxa (this block is not recommended) <code>+  * **DATA:** is a CHARACTERS block that includes not only the definition of characters but also the definition of taxa (this block is not recommended) <code>
 BEGIN DATA; BEGIN DATA;
  DIMENSIONS NTAX=5 NCHAR=20;  DIMENSIONS NTAX=5 NCHAR=20;
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 </code> </code>
  
-  * SETS: descriptions of collections of objects. These objects include characters, taxa, trees, states, and kinds of changes. In addition, partitions of characters, taxa, and trees can be formed. <code>+  * **SETS:** descriptions of collections of objects. These objects include characters, taxa, trees, states, and kinds of changes. In addition, partitions of characters, taxa, and trees can be formed. <code>
 BEGIN SETS; BEGIN SETS;
  [CHARSET charstet_name [({STANDARD|VECTOR})]=character-set;]  [CHARSET charstet_name [({STANDARD|VECTOR})]=character-set;]
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 </code> </code>
  
-  * ASSUMPTIONS: assumptions about the data. These can include assignment of weights to various characters, specification of the nature of character changes, exclusion of particular characters, and designation of ancestral states. <code>+  * **ASSUMPTIONS:** assumptions about the data. These can include assignment of weights to various characters, specification of the nature of character changes, exclusion of particular characters, and designation of ancestral states. <code>
 BEGIN ASSUMPTIONS; BEGIN ASSUMPTIONS;
  [OPTIONS [DEFTYPE=type-name]  [OPTIONS [DEFTYPE=type-name]
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 </code> </code>
  
-  * CODONS: contains information about the genetic code, the regions of DNA and RNA sequences that are protein coding, and the location of triplets coding for amino acids in nucleotide sequences. <code>+  * **CODONS:** contains information about the genetic code, the regions of DNA and RNA sequences that are protein coding, and the location of triplets coding for amino acids in nucleotide sequences. <code>
 BEGIN CODONS; BEGIN CODONS;
  [CODONPOSSET [*] name [({STANDARD|VECTOR})]=  [CODONPOSSET [*] name [({STANDARD|VECTOR})]=
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 </code> </code>
  
-  * NOTES: allows attachment of additional information (text, pictures, etc.) to various objects (trees, taxa, characters, etc.) in the file. <code>+  * **NOTES:** allows attachment of additional information (text, pictures, etc.) to various objects (trees, taxa, characters, etc.) in the file. <code>
 BEGIN NOTES; BEGIN NOTES;
  [TEXT [TAXON=taxon-set] [CARACTER=character-set] [STATE=state-set] [TREE=tree-set]  [TEXT [TAXON=taxon-set] [CARACTER=character-set] [STATE=state-set] [TREE=tree-set]
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 Description in Maddison, D. R., D. L. Swofford and W. P. Maddison. 1997. NEXUS:  an extensible file format for systematic information.  Description in Maddison, D. R., D. L. Swofford and W. P. Maddison. 1997. NEXUS:  an extensible file format for systematic information. 
 \\ Systematic Biology 46:590-621. \\ Systematic Biology 46:590-621.
 +
 +
 +
 +===== NCL =====
 +[[http://hydrodictyon.eeb.uconn.edu/ncl/|NCL]]
 +
 +NEXUS Class Library (NCL) is an integrated collection of C++ classes designed to allow the user to quickly write a program that reads NEXUS-formatted data files. It also allows easy extension of the NEXUS format to include new blocks of your own design
 +
 +
nexus.1197452509.txt.gz · Last modified: 2008/07/22 13:30 (external edit)