calc: Selecting Subformulas
11.1 Selecting Sub-Formulas
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When working with an algebraic formula it is often necessary to
manipulate a portion of the formula rather than the formula as a whole.
Calc allows you to “select” a portion of any formula on the stack.
Commands which would normally operate on that stack entry will now
operate only on the sub-formula, leaving the surrounding part of the
stack entry alone.
One common non-algebraic use for selection involves vectors. To work
on one element of a vector in-place, simply select that element as a
“sub-formula” of the vector.
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calc: Algebra
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calc: Algebraic Manipulation