Introduction:

This tool takes a peak table file as input and performs log transformation (base 2) or median centered log2 transformation on the peaks.

Input files:

1. Peak table file in Tab-delimited txt format, with the first column as the compound identifier and others as samples.

For example:

AlignID	STDmix_GC_01	STDmix_GC_02	STDmix_GC_03
1	1486892478	561322777	3448620272
Nitrogen dioxide	5492977592	684434115	3265669981
Ethanol, 2-fluoro-	2265686433	4182838129	4365291513
3-Pentanone, 2,2,4,4-tetramethyl-	13390154	12612932	21155307
Hydrazine	14588107	8510918	7224351

Output files:

'log2_transformed_pkTable.txt', log2 transformed peak table file in Tab-delimited txt format by using two algorithms, log2_transform or log2_transform_median_center.

Note:

The transform formula is: log2(value+1)

The median center is performed on the row (compound data).