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Reading Intensities Correctly #22
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So I went ahead and opened your file in GC Chemstation (Rev. B.04.02 SP1 [212]) and it looks like the scaled version: So I think MassHunter is wrong. Either that or there's a way to toggle the scaling of the y-axis and you may have it turned off. If so, the only issue is to figure out how to determine programmatically which version a 179 file belongs to. I'm thinking of just going with my hypothesis that the "mustang chemstation" produces your style of file, but I don't really know if that's correct |
Hi @zrolfs. I tried to fix this on the dev branch by telling the parser to assume the "mustang" files are in the 8-byte format (like your file). Want to test it out for me? You should be able to install it by running remotes::install_github("ethanbass/chromConverter", ref="dev"). You'll likely need to reload your R session to purge the old version from your cache. P.S. |
Hi Ethan, Quick thoughts: |
Congratulations!!!! hope you and the family have a nice holiday |
Happy new year! I am closing this issue for now because my fix has been integrated into the main branch (a50105e) and I think everything is all working as it should. If you run into any additional issues, feel free to reopen. |
Hello! Thank you for this excellent repository. I'm trying to use read_chemstation_ch.R to read in a v179 .ch GC-FID file. The retention times seem right, but the intensities are very different from what I see when I open the file in MassHunter. Could there be an issue with the scaling factor that is applied?
I've attached the .ch (FID1A.txt) file as well as an excel where I compared the MassHunter and read_chemstation_ch intensities. Any help is appreciated!
FID1A.txt
Test.xlsx
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