ReplacePart
 Usage
Notes
 Further Examples
Here is a list.
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This replaces {b, c} by X.
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This replaces the element b at position {2, 1} of vv by X.
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This replaces the elements at positions 2 and 4 of vv by X.
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Here is another list.
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Here are the elements of vv and ww at the specified positions.
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This replaces b by  and d by  .
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The defined function EvaluateAt evaluates a held expression exactly at a specified list of positions.
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Here 3 + 4 and 2*4 get evaluated.
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This defines the function ApplyAt which applies a function to the held parts of an expression at specified positions.
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This applies Power at positions  and  .
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This defines the function ReplaceAt which applies a rule or a list of rules to the parts of an expression at specified positions.
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This applies a list of two rules at positions  and  .
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