GNU Emacs Calc 2.02 Manual

11.1: Selecting Sub-Formulas

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.

• Making Selections
• Changing Selections
• Displaying Selections
• Operating on Selections
• Rearranging with Selections