ReplacePart

expr with the operand at position i replaced by new — Wolfram 1-based positions, negative counting from the end.

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ReplacePart(expr, i -> new)expr with its ith operand replaced (1-based; i < 0 counts from the end)

ReplacePart(expr, {i, j, …} -> new)like the scalar form, drilling into nested operands along the given path

ReplacePart(expr, {rule1, rule2, …})applies every rule, each position resolved against the RESULT of the earlier ones

Typed signatures

Type	Package	Applies
`(any, expression<Rule> \| list<expression<Rule>>) -> any`	`combinatorics`	always

Domain: Collections

Examples

Basic #

\mathrm{ReplacePart}(\bigl\lbrack a, b, c\bigr\rbrack, \mathrm{Rule}(2, z))

Out

\bigl\lbrack a, z, c\bigr\rbrack

Scope #

\mathrm{ReplacePart}(\bigl\lbrack a, b, c\bigr\rbrack, \mathrm{Rule}(-1, z))

Out

\bigl\lbrack a, b, z\bigr\rbrack

\mathrm{ReplacePart}(\bigl\lbrack a, b, c\bigr\rbrack, \bigl\lbrack\mathrm{Rule}(1, x), \mathrm{Rule}(3, y)\bigr\rbrack)

Out

\bigl\lbrack x, b, y\bigr\rbrack

\mathrm{ReplacePart}(\bigl\lbrack\bigl\lbrack a, b\bigr\rbrack, c\bigr\rbrack, \mathrm{Rule}(\bigl\lbrack1, 2\bigr\rbrack, z))

Out

\bigl\lbrack\bigl\lbrack a, z\bigr\rbrack, c\bigr\rbrack

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