# Question:How to write functions with parameters that act on an object multiple times?

## Question:How to write functions with parameters that act on an object multiple times?

Maple 2022

This question was inspired by https://www.mapleprimes.com/questions/235613-Convert-A-List-With-Nested-Ordered-Sets.

I want to replace several characters of a string separately.

s:="[ (0, 1), (1, 2), (1, 10), (2, 3), (3, 4), (4, 5), (4, 9), (5, 6), (6, 7), (7, 8),(8, 9), (10, 11), (11, 12), (11, 16), (12, 13), (13, 14), (14, 15), (15, 16)]"

Like this their will be many say n element then I need to a list as

{{0,1},{1,2},{1,10},......}

I took the for-loop as follows, but I'm wondering if there's a more concise way to deal with it.

with(StringTools):
L:="[ (0, 1), (1, 2), (1, 10), (2, 3), (3, 4), (4, 5), (4, 9), (5, 6), (6, 7), (7, 8),(8, 9), (10, 11), (11, 12), (11, 16), (12, 13), (13, 14), (14, 15), (15, 16)]":
L1:=["(",")","[","]"]:
L2:=["{","}","{","}"]:
X:=L:
for i from 1 to nops(L1) do
X:=SubstituteAll(X,L1[i],L2[i]);
end do:
parse(X)

{{0, 1}, {1, 2}, {1, 10}, {2, 3}, {3, 4}, {4, 5}, {4, 9}, {5, 6}, {6, 7}, {7, 8}, {8, 9}, {10, 11}, {11, 12}, {11, 16}, {12, 13}, {13, 14}, {14, 15}, {15, 16}}

I know that a function acting repeatedly can use f @@ n, for example,

(sin@@2)(x);

But if f  has some  arguments, can it still be used?

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