stackoverflow: t.list – R documentation

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t.list

Transpose a list-of-lists

For a nested list x, returns another nested list y such that x[[a]][[b]] == y[[b]][[a]] for all indices in the original list.

## S3 method for class 'list'
t(x)

`x`	a list of lists

Occasionally, sparse matrices are represented this way.

zerweck, Neal Fultz