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Symbolic DifferentiationVisual Prolog is well suited for symbolic mathematics because it is easy and elegant to handle expressions as Prolog structures. A typical dialog with the system could be write an expression: 10*x^4 Differentiated expression: 0*x^4+10*4*x^3*1 Reduced expression: 40*x^3 The Diff program consist of the following parts:
Of these parts, the reducing of an expression is the most complicated. From the Goal-section, the main parts of the program, can be examined. tokl(STR,TOKL) : converts the string to a list of tokens. s_exp(TOKL,OL,EXP) : used by the parser. d(EXP,"x",EXP1) : differentiate the expression. reduce(EXP1,EXP2) : the expression is reduced.
Diff.PRJ (Uses win32 VDE) |