Popup Menu Items Relating to Formulas


If you have clicked on a Formula, the statement-specific menu items in the popup menu are:

Decompose RHS of this Formula (toggle first)

Decompose RHS of this Formula (toggle last)

Decompose Selected Expression (fm) [This will only be visible in the menu if you have selected two or more characters in the Formula.]

We describe the effect of clicking on either of these below. Also visible (and described elsewhere) are:

Evaluate (selection or coeff/var at cursor)

Start a Group of Toggles

Decomposing the Right-hand Side of a Formula

An example makes the idea of decomposition clear. You choose whether to put the toggle set first or last.

Whenever you decompose the RHS of a formula, the program tries to give suggestive names for the toggles. The exact terms which have been grouped into one toggle are shown in the memo on the AnalyseGE form and in the Header Exxx in the ViewHAR form which gives the Formulas actually being evaluated. You should check these to be sure exactly what terms from the RHS of the formula have been grouped together.

When decomposing the RHS of a formula, the program respects brackets and SUMS; the decomposition produced is similar to the Intelligent decomposition (as distinct from the Complete decomposition) of Equations.

Occasionally the decomposition of the Formula may not be quite what you want. In this case, it should be reasonably easy to modify the expressions in the memo on the AnalyseGE form and then re-evaluate them.

Decompose Selected Expression (fm)

This is similar to decomposing the RHS of the Formula, but here you just see a decomposition of the expression you have selected (rather than of the whole RHS). The toggle is always put first when you decompose a selected expression.

When you decompose the selected expression, the decomposition produced respects brackets and SUMs. When you decompose the RHS of a Formula, you see separate terms in the decomposition for the different parts which are added or subtracted on the RHS. When you decompose the selected expression, you see separate terms in the decomposition for the different parts which are added, subtracted, multiplied or divided. The last term in the decomposition shows the values of the expression you have selected. Examples will make this clear.



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