Input:
library(ISLR) data("NCI60")

`cancers=NCI60$labs
gene_counts <- table(cancers)
g3 <- names(gene_counts[gene_counts > 3])
g3`

`subset_NCI60 <- NCI60[cancers %in% g3]
subset_NCI60$labs`

Output:
[1] "BREAST" "CNS" "COLON" "LEUKEMIA" "MELANOMA" "NSCLC" "OVARIAN" [8] "RENAL"

` [1] "CNS"         "CNS"         "CNS"         "RENAL"       "BREAST"     
 [6] "CNS"         "CNS"         "BREAST"      "NSCLC"       "NSCLC"      
[11] "RENAL"       "RENAL"       "RENAL"       "RENAL"       "RENAL"      
[16] "RENAL"       "RENAL"       "BREAST"      "NSCLC"       "RENAL"      
[21] "UNKNOWN"     "OVARIAN"     "MELANOMA"    "PROSTATE"    "OVARIAN"    
[26] "OVARIAN"     "OVARIAN"     "OVARIAN"     "OVARIAN"     "PROSTATE"   
[31] "NSCLC"       "NSCLC"       "NSCLC"       "LEUKEMIA"    "K562B-repro"
[36] "K562A-repro" "LEUKEMIA"    "LEUKEMIA"    "LEUKEMIA"    "LEUKEMIA"   
[41] "LEUKEMIA"    "COLON"       "COLON"       "COLON"       "COLON"      
[46] "COLON"       "COLON"       "COLON"       "MCF7A-repro" "BREAST"     
[51] "MCF7D-repro" "BREAST"      "NSCLC"       "NSCLC"       "NSCLC"      
[56] "MELANOMA"    "BREAST"      "BREAST"      "MELANOMA"    "MELANOMA"   
[61] "MELANOMA"    "MELANOMA"    "MELANOMA"    "MELANOMA"   `

My problem:
Only “BREAST” “CNS” “COLON” “LEUKEMIA” “MELANOMA” “NSCLC” “OVARIAN” and “RENAL” should appear in the second output. What am I doing wrong?

`subset <- NCI60[NCI60$labs %in% g3, ]`

I know this is the correct way, but when I do, my R throws this error:

`> subset <- NCI60[NCI60$labs %in% g3, ]
Error in NCI60[NCI60$labs %in% g3, ] : incorrect number of dimensions`