数据集长这样:
Gene SampleName
gene1 sample1
gene1 sample2
gene1 sample3
gene2 sample2
gene2 sample3
gene2 sample4
gene3 sample1
gene3 sample5
我的目标是创建一个这样的数据矩阵:
gene1 gene2 gene3
gene1 - 2 1
gene2 - - 0
gene3 - - -
gene1
与gene2
的值为2
,因为它们共享相同的样本sample2
和sample3
。gene1
与gene3
的值为1
,因为它们只共享一个相同的样本-sample1
。我的问题是如何在R或Perl中实现这个目标?实际数据集要大得多。非常感谢您的帮助。
这是R的
dput(df)
输出:df <- structure(list(Gene = c("gene1", "gene1", "gene1", "gene2", "gene2",
"gene2", "gene3", "gene3"), SampleName = c("sample1", "sample2",
"sample3", "sample2", "sample3", "sample4", "sample1", "sample5"
)), .Names = c("Gene", "SampleName"), row.names = c(NA, -8L), class = "data.frame")