Answered Essay: Write a 3-argument function replace which takes a list ls, an integer n and an value x as a

Write a 3-argument function replace which takes a list ls, an integer n and an value x as arguments, and returns a list where the element in the n th position has been replaced by x. The other elements in the list should stay the same as before. The positions start with 0. If n is not a valid position in ls, then ls itself should be returned.This needs to be done in standard ML.

sample test cases:

– replace; val it = fn: ’a list * int * ’a -> ’a list –

replace(nil, 2, 3); val it = []: int list

– replace([1,2,4], 2, 3); val it = [1, 2, 3]: int list

– replace([1,2,4], 5, 0); val it = [1, 2, 4]: int list

– replace([2.3, 5.0, 2.001, 1.11], 1, 50.0); val it = [2.3, 50.0, 2.001, 1.11]: real list

Expert Answer


function ls=replace(ls, n ,x) %start of function replace
% This function takes a list and replaces the element at position n-1
% with value x and return the list. If the size of list ls is less than n
% it returns the original list
if(length(ls)>=n) %Checking if the length of ls is atleast n
ls(n+1)=x; % As position or n starts from 0 but
%index start from 1 in matlab we use n+1 as index.
end %end of if
disp(ls); %displaying ls
end %end of function


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