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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( )


#3: correlation heatmap (+hierarchical clustering)

cor_raw<-cor(log_raw_ex)
library(pheatmap)
library(ggplot2)
group2<-c (paste0("collagen",1:2) ,paste0("collagen and cisplatin",1:2),paste0("non",
 "non",1:4))
group2
pheatmap(cor_raw ,
         cellwidth=20,
         cellheight=20,
         labels_row=group2,
         labels_col=group2,
         color="blue2","yellow","burlywood3", 
         clustering_distance_cols ="binary",
         clustering_distance_rows ="binary")

error Error in sample.int(m, k) : vector size cannot be NA/NaN In addition: Warning message: In sample.int(m, k) : NAs introduced by coercion

The pheatmap function is meant for numeric data, but you are providing character data. What sort of heatmap do you expect to get from character data?