在数据集中选择特定字符长度

Question

我有一个蛋白质组数据集和一个肽列表。例如：

x = c("DFGVEVDNNSYK","EFHIR","VGQEYQPR","AYQVEGDWSGAAFMLVAGAIAGSIEVENLNTR","SHQADR","AILDALK","LR").

我想提取一个肽长在4-10之间的列表肽。我怎么才能用

nchar?

Answer 1

使用nchar()函数：

x <- c("DFGVEVDNNSYK", "EFHIR", "VGQEYQPR", "AYQVEGDWSGAAFMLVAGAIAGSIEVENLNTR", "SHQADR", "AILDALK", "LR")
output <- x[nchar(x) >= 4 & nchar(x) <= 10]
output

[1] "EFHIR"    "VGQEYQPR" "SHQADR"   "AILDALK"