U

unitV()

unitV(Vector1) vector

Returns either a row- or column-unit vector, depending on the form of Vector1.

Vector1 must be either a single-row matrix or a single-column matrix.

unLock

unLock Var1[, Var2] [, Var3] ...
unLock Var.

Unlocks the specified variables or variable group. Locked variables cannot be modified or deleted.

See Lock, here, and getLockInfo(), here.