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MapleEval
evaluate a Maple object in external code
EvalMapleProc
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)
EvalMapleProc(kv, fn, n, arg1, arg2, ..., argN)
EvalMapleStatement(kv, statement)
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Parameters
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kv
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kernel handle of type MKernelVector
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s
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type ALGEB object
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fn
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Maple Procedure object of type ALGEB
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n
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number of args following
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arg1, ..., argN
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type ALGEB arguments to fn
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statement
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command string
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Description
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MapleEval evaluates the given Maple object, s. Evaluation is performed according to the rules used by the eval command.
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EvalMapleProc invokes the procedure, fn(arg1, arg2, ..., argN), where n specifies the number of arguments supplied to the function call. The result of the evaluation is returned as a Maple object. fn must be a Procedure object.
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EvalMapleStatement 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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Examples
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#include "maplec.h"
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ALGEB M_DECL MyStats( MKernelVector kv, ALGEB *args )
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{
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ALGEB mean, sd, f;
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if( 1 != MapleNumArgs(kv,(ALGEB)args) ) {
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MapleRaiseError(kv,"one argument expected");
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return( NULL );
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}
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if( !IsMapleList(kv,args[1]) ) {
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MapleRaiseError(kv,"list expected");
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return( NULL );
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}
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f = EvalMapleStatement(kv,"Statistics[Mean]:");
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mean = EvalMapleProc(kv,f,1,args[1]);
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f = EvalMapleStatement(kv,"Statistics[StandardDeviation]:");
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f = ToMapleFunction(kv,f,1,args[1]);
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sd = MapleEval(kv,f);
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return( ToMapleExpressionSequence(kv,2,mean,sd) );
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}
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Execute the external function from Maple.
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