This is a helper function for many *_byname
functions.
prep_vector_arg(a, vector_arg)
a | a matrix or list of matrices |
---|---|
vector_arg | the vector argument over which to apply a calculation |
vector_arg
, possibly modified when a
is a list
It is potentially ambiguous to specify a vector or matrix argument, say, margin = c(1, 2)
when applying
the *_byname
functions to unary list of a
.
Rather, one should specify, say, margin = list(c(1, 2)
to avoid ambiguity.
If a
is a list,
vector_arg
is not a list and has length > 1 and length not equal to the length of a,
this function returns a list value for vector_arg
.
If a
is not a list and vector_arg
is a list,
this function returns an un-recursive, unlisted version of vector_arg
.
Note that if vector_arg
is a single matrix, it is automatically enclosed by a list when a
is a list.
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