[R] how to include if conditions in dplyr filter function

Yuan Chun Ding ycd|ng @end|ng |rom coh@org
Wed Oct 27 00:38:35 CEST 2021

Hi R users,

I thought the follow R code should work, but I got error, Can you fix my code?

Thank you,


outlier_tcga_MAD3 <- outlier_tcga %>% filter(n_two >0) %>% 
      mutate(freqMAD3_gain2ratio = N_MAD3_gain2/n_two )%>% 
  if (N_MAD3 < 9) {filter(freqMAD3_gain >=1)} else if (N_MAD3 > n_two*2 )
                  {filter (freqMAD3_gain >= 0.8 & freqMAD3_gain2ratio >= 0.33)} else 
                  {filter(freqMAD3_gain2 >=0.3 )} %>% 

Error in if (.) N_MAD3 < 9 else { : 
  argument is not interpretable as logical
In addition: Warning message:
In if (.) N_MAD3 < 9 else { :
  the condition has length > 1 and only the first element will be used


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