Question: FASTX-toolkit in iMAC
gravatar for Arash
3.7 years ago by
Iran, Islamic Republic Of
Arash20 wrote:

Hi, When I want to use FASTX-toolkit on iMAC , I get the following error "Invalid quality Score value (char '#' ord 35 quality value -29) on line 4 "

what does mean? Thank you!

rna-seq • 1.0k views
ADD COMMENTlink modified 3.7 years ago by Michael Dondrup47k • written 3.7 years ago by Arash20
gravatar for Michael Dondrup
3.7 years ago by
Bergen, Norway
Michael Dondrup47k wrote:

I think this means that the encoding of the quality values in the fastq file is different from what the fastx tool expects. Presence of # indicates 'Sanger' encoding (Ascii code - 33):

perl -e 'print ord("#") - 33, "\n"'

See : for a solution.

ADD COMMENTlink written 3.7 years ago by Michael Dondrup47k
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