Amino acid and dipeptide composition
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Input: amino acid sequences in the fasta format
Output: amino acid composition or dipeptide composition

Output file format:

[SVM_light format] this can be used as the input file for SVM-light. The 
format is shown below. Note that the first letter '0' is not the entry name, 
but it is used to identify the type of each sequence (1 for a positive sample, 
-1 for a negative sample, or 0 for an unknown sample). In this output, 
all sequences are assigned with '0'.

0 1:value1 2:value2 3:value3 4:value4 5:value5 6:value6 7:value7 8:value8 

[TAB-delimited table] this is a simple table format with the header in the 
first line. Sequence ID and length (aa) are listed before frequencies.

The order of amino acid frequencies: K N T R S I M H P L E D A G V Q Y C W F
The order of dipeptide frequencies is specified as: (ARNDCQEGHILKMFPSTWYV) x 
(ARNDCQEGHILKMFPSTWYV) = AA AR AN AD AC AQ AE ... VS VT VW VY VV