How to give the total amount of row from a matrix as a value?

I need to define the total amount of row of a matrix as a variable

and don't how to extract this number.

For example, let

M=

1 2

2 4

3 6

4 8

5 10

In this case the row number would be 5.

I thought there would be a command such as

row(M)

but did not work.

Hopefully someone knows how to solve this

Thank you for your help

Emerson

Answer 1

[Matt Fig]

size(M,1)  % The number or rows of an array.
size(M,2)  % The number of columns of an array.

also,

S = size(M);
S(1)  % The same as size(M,1)
S(2)  % The same as size(M,2)

In general,

A = rand(4,5,2,2);
S = size(A)

notice the connection between S and the argument to RAND.

[Emerson De Souza]

Hi Matt Fig,

thank you again for your fast reply.

That was all what I needed.

I'm working tonight, may

be you will find more questions.

Or, I wish you a nice night

Emerson

Answer 2

[Teja Muppirala]

help size