How to calculate the mean and standard deviation of the following matrix considering only the nonzero values of the matrix ?

A=[2 3 5 16;0 8 7 0;19 4 6 0;14 0 0 9]

Answer 1

[Animesh]

In MATLAB, you can calculate the mean and standard deviation of the non-zero values in a matrix using the following steps:

Step 1: Extract the non-zero values from the matrix.

Step 2: Calculate the mean of the non-zero values.

Step 3: Calculate the standard deviation of the non-zero values.

Here's the MATLAB code to accomplish this:

A = [2 3 5 16; 0 8 7 0; 19 4 6 0; 14 0 0 9];

nonzero_values = A(A ~= 0);  % Extract non-zero values from matrix A
mean_value = mean(nonzero_values);  % Calculate the mean of non-zero values
std_value = std(nonzero_values);  % Calculate the standard deviation of non-zero values

disp("Mean: " + mean_value);
disp("Standard Deviation: " + std_value);