type of matrix ?

Hi

i want gerally ask how many typ of matrix do we have ?

and specially what is the neanning of " r-by-q matrix " or " s-by-q matrix " ?

[Adam]

What do you mean by 'type' of matrix? A matrix is just a 2-dimensional array, and thus r-by-q matrix means dimensions are r and q, likewise s-by-q.

[mohsen tawakoli]

you mean that for example in r-by-q r is row and q is column ?

[Adam]

yes

[Stephen23]

"...for example in r-by-q r is row and q is column ?"

Yes, because this is the definition used in mathematics:

https://en.wikipedia.org/wiki/Matrix_(mathematics)

[mohsen tawakoli]

thanks a lot

[Adam Danz]

Matrices only store numeric data. If there are non-numeric or mixed data types, they can be stored in a cell array that can have any number of dimensions.

Here's an example of a 3-by-2 cell array.

c = {'a', 5; 'b', 8; 'c', 0}

c =
  3×2 cell array
    {'a'}    {[5]}
    {'b'}    {[8]}
    {'c'}    {[0]}

[Walter Roberson]

In MATLAB, matrices can have any of the following arithmetic types:

• uint8, uint16, uint32, uint64 (unsigned integer)
• int8, int16, int32, int64 (signed integer)
• single (IEEE 754 Single Precision Binary Floating Point), double (IEEE 754 Double Precision Binary Floating Point)

and also the arithmetic-like types

• char
• logical .

There are also the composite types:

• struct
• cell

MATLAB also supports objects, and there are a wide variety of object classes. These include:

• string (array)
• graphic objects
• transfer functions and state space models (Control System Toolbox)
• symbolic expressions (Symbolic Toolbox)

Most MATLAB objects can be made into arrays. Some of the notable ones that cannot be made into arrays are:

• function handles
• tables (this one is open to debate about what arrays mean)
• symbolic functions