MATLAB: Replacing elements in an array

arrayMATLABreplacereplacing

Didn't find a relevant answer.

Suppose we have an array

R=[1 2 1 2 2 2]';
How to replace "2" with "4" ?
Thank you.

Best Answer

R=[1 2 1 2 2 2]';
R(R==2) = 4;

See Logical Indexing – Multiple Conditions

Related Solutions

MATLAB: Replace elements in array

I wouldn't call this an algorithm. It's just indexing. If something more robust is needed we'll need a more detailed description or set of rules to follow.

A = [1, 2, 3, 4, 5, 6];
A = A([1,3,2,4,5,6])
A = 1×6
     1     3     2     4     5     6

> Vector A is a vector of unknown length and content, in which the k-th and j-th elements change.

A = [1, 2, 3, 4, 5, 6];
k = 4; 
j = 2; 
A([k,j]) = A([j,k])
A = 1×6
     1     4     3     2     5     6

MATLAB: Replacing elements of a matrix with vectors

Simply put the replacement arrays inside a cell array and then use the starting matrix as indices:

>> mat = [1,2;3,4];
>> rep = {[1,2,1],[2,7,2],[6,4,3],[9,8,2]};
>> cell2mat(rep(mat))
ans =
     1     2     1     2     7     2
     6     4     3     9     8     2

Best Answer

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MATLAB: Replace elements in array

MATLAB: Replacing elements of a matrix with vectors

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