Question about Texas Instruments TI-89 Calculator
Clear the contents of variables. Somme variable of letter you are using contains an object incompatible with the arguments of the expand( function ; a matrix, a list, a reserved system variable.
Clear the calculator of old junk by resetting the RAM or executing the NewProb command, either from the keyboard or by pressing [Diamond][HOME][2nd][F6:CleanUp][2:NewProb][ENTER].
Here is a screan capture.
Hope it helps.
Posted on Oct 06, 2009
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Posted on Jan 02, 2017
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