freeze: Freeze and thaw matrices
In nspyrison/tourr: Implement Tour Methods in R Code

Some terminology: * frozen variables: the variables that have fixed values * warm variables: the remaining variables that vary freely

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freeze(input, frozen)

thaw(input, frozen)

A frozen matrix specifies which variables to fix in a projection matrix. Warm variables should be missing (NA) while frozen variables should be set to their fixed values.

frozen <- matrix(NA, nrow = 4, ncol = 2)
frozen[3, ] <- .5

input <- basis_random(4, 2)
freeze(input, frozen)
thaw(input, frozen)
freeze(basis_random(4, 2), frozen)