i am using EdgeR for my differential expression analysis. i want to define the contrast of interest but a bug appears with the following error message "unexpected input in "...…." i have gone through my command but i did not detect any typo or any error.
here is my command line
contrasts <- makeContrasts("30hpi" = group30hpi_infected – group30hpi_control, "90hpi" = group90hpi_infected – group90hpi_control, "180hpi" = group180hpi_infected – group180hpi_control, levels = design)
Error: unexpected input in "contrasts <- makeContrasts("30hpi" = group30hpi_infected –"
please any help to solve this bug would be immensely appreciated