Enter the body of text here

Code should be placed in three backticks as shown below

# include your problematic code here with any corresponding output 
# please also include the results of running the following in an R session 

sessionInfo( )

dds <- DESeqDataSetFromMatrix(countData=countdata, colData=coldata, design=~condition)

Error in DESeqDataSetFromMatrix(countData = countdata, colData = coldata, : could not find function "DESeqDataSetFromMatrix"

Did you do

library(DESeq2)

first? That's the error you get when the software has no idea what function you are referring to, because you haven't told it to load a library of functions.