CODEWITHSUNDEEP
arraysmatlab
user3226108
user3226108

Reputation: 119

replacing a particular number of an array by the number of that position of another array

I am trying to write a function to replace a particular number of an array by the number of that position of another array. However, it does not allow me to do so. I am quite new in using MATLAB. Any help will be appreciated.

arr1 = [
    1     3     8     9
    2    47    10     4
    2     4     6    86
    6     8    11     4];

arr2 = [
    3 4  1  8
    8 2 99  1
    0 6 77 11
    9 3  2  1]

I want to write a function that will replace any particular number of arr1 with the number of arr2 of that index. Suppose I want to replace 2 from arr1, then the output should be

out = [ 
    1     3     8     9
    8    47    10     4
    0     4     6    86
    6     8    11     4];

arr1(arr1==2) = arr2(arr1==2)

This allows me to do so. However, it does not allow me to write a generalizes function like 

function new = arrayReplace(arr1,arr2,number)
    idx = arr1==number;
    new = (arr1(idx)=arr2(idx));
end

to replace any number of arr1.

Any help!?

Upvotes: 1

Views: 51

Answers (1)

Rody Oldenhuis
Rody Oldenhuis

Reputation: 38032

You're almost there:

function arr1 = arrayReplace(arr1,arr2,number)
    idx = arr1==number;
    arr1(idx) = arr2(idx);
end

or, perhaps less confusing:

function arr3 = arrayReplace(arr1, arr2, number)
    idx  = arr1==number;
    arr3 = arr1;
    arr3(idx) = arr2(idx);
end

Upvotes: 3

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