how to calculate the sum of a matrix in matlab

To calculate the sum of a matrix (or array) in MATLAB, you can use the sum() function. This function can be applied to the entire matrix, or to a specific dimension of the matrix.

Here's an example of how to use the sum() function to calculate the sum of a matrix:

main.m
% Create a 3x3 matrix
A = [1 2 3; 4 5 6; 7 8 9];

% Calculate the sum of the entire matrix
total_sum = sum(sum(A))

% Calculate the sum of each column
column_sum = sum(A)

% Calculate the sum of each row
row_sum = sum(A, 2)
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In this example, we first create a 3x3 matrix A. We then use the sum() function to calculate the total sum of all elements in the matrix. To do this, we apply the sum() function twice - once to each dimension of the matrix. This gives us the total sum.

We can also use the sum() function to calculate the sum of each column or each row. To do this, we only apply the sum() function once, but we specify the dimension to sum over (1 for columns, 2 for rows). This gives us either a row vector (for column sums) or a column vector (for row sums) containing the sum of each column or row.