Use the Display Steps check box of the Simplification tab of the Options > Mode Settings command19_L5FP to turn Display Steps mode on or off.  You can also turn this mode on or off by an assignment of the form

DisplaySteps := truth-value

where truth-value is true or false.  Off is the factory default Display Steps mode.


Expressions can be simplified by clicking on the icon on the command toolbar or by clicking on the Simplify button in a Calculus commandCalculus_commands dialog box.  If Display Steps mode is on when an expression is simplified, only the first step in the simplification of the currently highlighted expression or subexpression is displayed in the algebra window.  Repeatedly click on the icon on the command toolbar to see successive steps in the simplification of an expression.


If Display Steps mode is on when Derive is trying to factor an integer, the part of the integer that remains un-factored and the factoring method being used is displayed on the status line.  See Factoring NumbersFactoring_Numbers for a list of the methods Derive uses to factor integers.


Since it has no meaning in the context of iterative programming, Display Steps mode is disabled within the scope of PROG and LOOP constructs in user-defined functions.  Instead the new DISPLAY and WRITE function can be used within user-defined functions to display intermediate values during the execution of Derive programs (for details, see Programming FunctionsProgramming_Functions).


You can try stepping through the simplification of any expression, however some or all of the intermediate steps may not be displayed.  Also, some algorithms (for example integer, polynomial, and matrix factoring) are not amenable to step-simplifying, since there are no equivalent intermediate steps to display.


An alternative to turning on Display Steps mode is to use the Simplify > Display Step command76D46L to step-simplify an expression.


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