size

Scilab Function
Last update : 16/12/2004

size - size of objects

### Calling Sequence

  `y=size(x [,sel])`
  `[nr,nc]=size(x)`

### Parameters

- `x` : matrix (including transfer matrix) or list or linear system (`syslin` )
- `y` : `1x2` integer vector or integer number
- `sel` : a scalar or a character string
- `nr,nc` : two integers

### Description

  Applied to :a matrix (constant, polynomial, string, boolean, rational) `x` , with only one lhs argument `size` returns a `1` x`2` vector [number of rows, number of columns]. Called with LHS=2, returns `nr,nc` = [number of rows, number of columns]. `sel` may be used to specify what dimension to get:
  1 or 'r': to get the number of rows
  2 or 'c': to get the number of columns
  '*': to get the product of rows and column numbers
  Applied to:a list it returns the number of elements. In this case only `y=size(x)` syntax can be used
  Applied to:

  a linear system, `y=size(x)` returns in `y` the (row) vector [number of outputs, number if inputs] i.e. the dimension of the corresponding transfer matrix. The syntax `[nr,nc]=size(x)` is also valid (with `(nr,nc)=(y(1),y(2)` ). If `x` is a linear system in state-space form, then `[nr,nc,nx]=size(x)` returns in addition the dimension `nx` of the `A` matrix of `x` .

  label='Applied to:'> an hypermatrix `y=size(x)` returns the vector of hypermatrix dimensions. `[n1,n2,...nn]=size(x)` returns the hypermatrix dimensions. `ni=size(x,i)` returns the ith dimension and `size(x,'*')` returns the product of dimensions.

### Examples

    [n,m]=size(rand(3,2))
    [n,m]=size(['a','b';'c','d'])
    x=ssrand(3,2,4);[ny,nu]=size(x)
    [ny,nu]=size(ss2tf(x))
    [ny,nu,nx]=size(x)

### See Also

`length` , `syslin` ,