to have, then for the new units. (If the value on the stack can be
simplified so that it doesn't contain any units, like @samp{ft/in} can
be simplified to 12, then @kbd{u c} will still prompt for both old
-units and new units. This can be disabled; @pxref{Customizing Calc}.)
-Assuming the old and new units you give are consistent with each
-other, the result also will not contain any units. For example,
-@kbd{@w{u c} cm @key{RET} in @key{RET}} converts the number 2 on the
-stack to 5.08.
+units and new units. Assuming the old and new units you give are
+consistent with each other, the result also will not contain any
+units. For example, @kbd{@w{u c} cm @key{RET} in @key{RET}} converts
+the number 2 on the stack to 5.08.
@kindex u b
@pindex calc-base-units
is @code{nil}.
@end defvar
-@defvar calc-allow-units-as-numbers
-When converting units, the variable @code{calc-allow-units-as-numbers}
-determines whether or not values which can be simplified so that
-they don't contain units (such as @samp{ft/in} can be simplified to 12)
-can be regarded as not containing units. If
-@code{calc-allow-units-as-numbers} is non-@code{nil}, then @kbd{u c}
-will prompt for both old units and new units when converting an expression
-like @samp{ft/in}, otherwise @kbd{u c} will only prompt for the new units.
-The default value of @code{calc-allow-units-as-numbers} is @code{t}.
-@end defvar
-
@defvar calc-undo-length
The variable @code{calc-undo-length} determines the number of undo
steps that Calc will keep track of when @code{calc-quit} is called.