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Memory address related coding questions

👩‍💻 Technical question

Find the address in memory for the element at 4th row and 5th column in the generated Tri- diagonal matrix using the same parameters (Base address 2700 , W= 4)

🤖 SheCodes Athena says:

Answered in 3.18 seconds

To calculate the memory address for a specific element in a matrix, we need to know the size of each element, the number of rows, and the number of columns. We also need to know if the matrix is stored in row-major order or column-major order.

Since the matrix is tridiagonal, we know that it has non-zero elements only on the main diagonal, the superdiagonal, and the subdiagonal. Therefore, it is a sparse matrix and we can store only the non-zero elements. To generate the matrix, we need to know the values of three parameters: N (the number of rows/columns), D (the value on the main diagonal), and E (the value on the superdiagonal/subdiagonal).

Assuming that the matrix is stored in row-major order, the memory address for an element at row i and column j can be calculated as follows:

address = base_address + i * num_columns * element_size + j * element_size

In this case, we are given the following parameters:

  • Base address = 2700
  • W = 4 (assuming this is the size of each element in bytes)
  • Row = 4
  • Column = 5

We also need to know the values of N, D, and E, but they are not given in the question. Therefore, it is not possible to calculate the memory address without knowing these values.

Therefore, the answer is:

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