MATLAB: Replacing elements in matrix with relational operations

matrixrelational operations

I am given a problem where I am given a matrix and I am suppose to change the values of the matrix depending on if a certain element of the matrix is greater than or less than a number. If it is greater than the variable n1 I am suppose to change the element to c1 and if is less than n1 I am suppose to change it to c2. I am to use only relational operations, I cannot use for, if, while or any implicit functions. How can I do this? This is what I have so far m3 is the matrix I am given

m4 = ((m3>n1)*c1)
m5 = ((m3<=n1)*c2)

Best Answer

M=randi(10,3);
n1 = 5;
c1 = 4;
c2 = 3;
M1 = M<5;
D1 = c1*M1;
M2 = M>=5;
D2 = c2*M2;
new_M = D1 + D2;
% In a single line
new_M = c1*(M<5) + c2*(M>=5);

Adapt the values of n1, c1 and c4 to yours needs.

Related Solutions

MATLAB: How can i write a code that show replacing the values in the combined matrix (m1m2) that are greater than n1 with c1, and those that are less than or equal to n1 with c2

Perhaps you mean something like this:

X = rand(3,4);  % Test data
match     = X > n1;
X(match)  = c1;
X(~match) = c2;

Another method:

pool = [c1, c2];
Y    = pool((X > n1) + 1)

MATLAB: Stuck in Indexing of a Matrix(or Cell Array)

E.g., using the cell array approach:

m= ['A','B','C'];
cs=size(m,2);
new_M = cell(cs*(cs-1),1); % Pre-allocate your cell array
k = 0; % Initialize counter for cell array
for i=1:cs
    for j=1:cs
        if i~=j
            s1=(m(i));s2=',';s3=(m(j));
            s=strcat(s1,s2,s3);
            disp(s);
            k = k + 1; % Increment cell array counter
            new_M(k) = {s}; % Stuff string into cell array element
        end    
    end
end

Best Answer

Related Solutions

MATLAB: How can i write a code that show replacing the values in the combined matrix (m1m2) that are greater than n1 with c1, and those that are less than or equal to n1 with c2

MATLAB: Stuck in Indexing of a Matrix(or Cell Array)

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