CODEWITHSUNDEEP
javaarraysmultidimensional-array
user1830307
user1830307

Reputation:

Efficent addition of indices to 2d-arrays of various sizes

If one had a set of 2d-arrays of different dimensions, say:

float[][] P = new float[2][3];
float[][] B = new float[2][2];
float[][] A = new float[32][2];
float[] E = new float[2];

currently holding no values.

Is it possible to add values to each index of the arrays by looping through the index values of the largest collective dimensions (in this case):

for (int i=0; i<32; i++){
    for (int j=0; j<3; j++){
         //doSomething to (P[i][j]) if P has this index
         //doSomething to (B[i][j]) if B has this index
         //doSomething to (A[i][j]) if A has this index
         //doSomething to (E[i][j]) if E has this index         
    }
}

Otherwise, one must have four separate loops!

Thank you.

Upvotes: 0

Views: 40

Answers (1)

Daniel
Daniel

Reputation: 6755

for (int i=0; i<32; i++){
    for (int j=0; j<3; j++){
         if(i < 2)
           doSomething(P[i][j]);
         if(i < 2 && j < 2)
           doSomething(B[i][j]);
         if(j < 2)
           doSomething(A[i][j]);
         if(i == 0 && j < 2)
           doSomething(E[i][j]);         
    }
}

You need the i == 0 part for E because you only want to modify everything once, not 32 times. Note that only B needs two conditions because the other conditions are enforced by the for loop.

Upvotes: 1

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