# Decontam analysis

**URL:** https://forum.qiime2.org/t/decontam-analysis/23713
**Category:** Other Bioinformatics Tools
**Tags:** decontam
**Created:** [July 26, 2022, 4:40pm UTC](https://forum.qiime2.org/t/decontam-analysis/23713 "2022-07-26T16:40:32Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Patricia\_Azevedo](https://forum.qiime2.org/user_avatar/forum.qiime2.org/patricia_azevedo/32/14830_2.png) [@Patricia\_Azevedo](https://forum.qiime2.org/u/Patricia_Azevedo)
#### Post date: [July 26, 2022, 4:40pm UTC](https://forum.qiime2.org/t/decontam-analysis/23713/1 "2022-07-26T16:40:32Z")

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Hi, I need some help with my analysis.  
I'm trying to plot the frequency of contaminants with Decontam but I have some errors:  
Error in data.frame(..., check.names = FALSE) :  
arguments imply differing number of rows: 64, 67  
In addition: Warning message:  
In plot\_frequency(physeq1, taxa\_names(physeq1)[c(1, 96)], conc = "QUANT\_READING") :  
Removed 3 samples with zero total counts (or frequency).  
The error in the data frame occurred because in the previous step the program exclude 3 samples with 0 reads and now the data do have not the same quantity of rows. How can I fix that to proceed with the analysis?  
Thank you so much!