How can I calculate the sample mean and sample variance

I have a pseudo-random matrics M, sizes K-by-N. How can I calculate the sample mean and sample variance:

1) for each column,

2) for the whole matrix?

Answer 1

[RAGHUNATHRAJU DASHARATHA]

A per my understanding you want to calculate mean and variance for each column and whole matrix.

I'll demonstrate it using below example

a=randi(10,3) % generates pseudo random matrix

a = 3×3

3 2 10 5 10 3 8 4 3

%Mean and Variance for each column
[V,M]=var(a)

V = 1×3

6.3333 17.3333 16.3333

M = 1×3

5.3333 5.3333 5.3333

%Mean and Variance for whole matrix
[b,c]=var(a,0,"all")

b = 10

c = 5.3333

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