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MapleEval - evaluate a Maple object in external code
EvalMapleProcedure - evaluate a Maple function object in external code
EvalMapleStatement - parse and evaluate a command string in external code
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Calling Sequence
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MapleEval(kv, s)
EvalMapleProcedure(kv, fn, args)
EvalMapleStatement(kv, statement)
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Parameters
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kv
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kernel handle returned by StartMaple
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s
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Maple object
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fn
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Maple name or procedure object
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args
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Maple expression sequence object
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statement
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command string
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Description
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These functions are part of the OpenMaple interface to Microsoft Visual Basic.
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The EvalMapleStatement function parses and executes the command string given in the statement argument. MapleAssign can be used to give external objects names that can be referenced in a command string. The command string must be terminated by a colon or semicolon. When using this command in OpenMaple, a colon suppresses the display of output.
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The MapleEval function evaluates the given Maple object, s. Evaluation is performed according to the rules used by the eval command.
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The EvalMapleProcedure function invokes the procedure, fn(args), where args is an expression sequence of arguments, possibly created by NewMapleExpressionSequence. If args is a single item, that object can be passed in directly instead of creating an expression sequence. The result of the evaluation is returned as a Maple object. The fn parameter must be a name or procedure object.
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Examples
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Sub SampleStats(ByVal kv As Long)
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Dim mean, sd, f, list, args As Long
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' create a data list
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list = MapleListAlloc(kv, 6)
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MapleListAssign kv, list, 1, ToMapleInteger(kv, 1)
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MapleListAssign kv, list, 2, ToMapleInteger(kv, 33)
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MapleListAssign kv, list, 3, ToMapleInteger(kv, 42)
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MapleListAssign kv, list, 4, ToMapleInteger(kv, 50)
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MapleListAssign kv, list, 5, ToMapleInteger(kv, 55)
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MapleListAssign kv, list, 6, ToMapleInteger(kv, 67)
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' build the argument expression sequence
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args = NewMapleExpressionSequence(kv, 1)
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MapleExpseqAssign kv, args, 1, list
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' get the name of the function to call, and compute the mean
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f = EvalMapleStatement(kv, "Statistics[Mean];")
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mean = EvalMapleProcedure(kv, f, args)
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Write #1, "Mean", MapleToFloat64(kv, mean)
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' compute the standard deviation using a different method -- build
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' up the function object and call MapleEval on it
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f = EvalMapleStatement(kv, "Statistics[StandardDeviation];")
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f = ToMapleFunction(kv, f, args)
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sd = MapleEval(kv, f)
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Write #1, "Standard Deviation", MapleToFloat64(kv, sd)
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End Sub
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