Hello all,

I am trying to analyze a plant metabolomics database with PAPi, but haven't been able to get even started as there is a constant error apparently related with the data formatting. All examples from the package work fine, and my own data looks in the same format as the example metabolomics data set. My database contains 20 compounds (rows) and 80 samples (columns), the column names are "Sample1", "Sample2" ... "Sample80"; the second row indicate two conditions, healthy or infected. The first column has the KEGG codes instead of compound names. Below is a portion of my database (first six rows and columns).

> papivoc[1:6, 1:6]
       Names   Sample1   Sample2   Sample3   Sample4   Sample5
1 Replicates   healthy   healthy   healthy   healthy   healthy
2     C19757 2.1927358 1.6329086 2.4302252 0.5544893      <NA>
3     C00042      <NA> 1.0817259      <NA>      <NA> 0.7601545
4     C11391      <NA> 0.9295942      <NA>      <NA>      <NA>
5     C14272 1.2880552 1.2894686 0.8696715 1.9424637      <NA>
6     C07287 1.4880006 1.4538546 1.2594548 1.2812344 0.2241397

All the columns in the data.frame are formatted as characters

> str(papivoc)
'data.frame':    21 obs. of  81 variables:
 $ Names   : chr  "Replicates" "C19757" "C00042" "C11391" ...
 $ Sample1 : chr  "healthy" "2.1927358" NA NA ...
 $ Sample2 : chr  "healthy" "1.6329086" "1.0817259" "0.9295942" ...
 $ Sample3 : chr  "healthy" "2.4302252" NA NA ...

The error message is the following

> papiresults <- papi(papivoc, save = FALSE, offline = FALSE)
[1] "Online analysis being performed..."
[1] "PAPi in progess..."
[1] "Data frame loaded..."
  |=                                                 |   2%
Error in names(comp)[1] <- "value" : 
  'names' attribute [1] must be the same length as the vector [0]
In addition: Warning message:
In if (getpath != 0) { :
  the condition has length > 1 and only the first element will be used

Thanks for any help in advance

Hannier Pulido

Graduate student

Department of Biology, Penn State University

Hi Hannier,

I have tested PAPi and it seems to b working well.

Would you be able to send me your dataset in a csv file so I can test it?

Cheers.

Raphael

I am having the same issue;  how did you fix this?  Is there an update I need to do?  

Thanks in advance,

Kara

Hi Hannier,

I am sorry to hear that you are having problems with PAPi. I will investigate your problem and come back to you soon.

Cheers.

Raphael