列名的子矩阵

Submatrix by colname

我有一个带有行名和列名的 matrix,我想将其缩减为 submatrix 某些行/列名。指定的名称位于 ~20 值的字符串向量中,而矩阵具有 55.000 rownames805 colnames。我怎样才能在 R 中有效地做到这一点?

IFNGenes = c('TIMM10','UBE2L6','MX1','IF16','IFI44L','IFIT3','ISG15','OAS1','RSAD2','IFI44','OAS3','DOX58','HERC5','BATF2','LIPA','RSAD2.1')

subMatrix = theMatrix[,IFNGenes]
Error in theMatrix[, IFNGenes] : subscript out of bounds

如果我理解你的问题,你正在寻找这样的东西:

x <- matrix(1:100, 10)
rownames(x) <- LETTERS[1:10]
colnames(x) <- letters[1:10]
x[c("C", "F", "A"), c("d", "b", "e")]

您还可以这样做:

x[c("C", "F", "A"), c(4, 2, 5)]

如果您使用矩阵中不存在的 rowname-index(同名),则会出现错误:

> x[c("C", "F", "XX"), c(4, 2, 5)]
Error in x[c("C", "F", "XX"), c(4, 2, 5)] : subscript out of bounds

您可以找到如下索引:

r <- c("C", "F", "XX")
r[which(! r %in% rownames(x))]

对于您必须测试的数据:

IFNGenes[which(! IFNGenes %in% colnames(theMatrix))]