parents ( ) - left and right parenthesis

Calling Sequence

(expression)

[...]=func(e1,e2,...)

[x1,x2,...]=(e1,e2,...)

x(i,j)

v(i)

[...]=l(i)

Parameters

• x : matrix of any possible type
• v : row or column vector of any possible type
• l : list variable
• func : any function name
• e1,e2,... : any possible type expression

Description

Left and right parenthesis are used to

* Specify evaluation order within expressions,

* Form right-hand-side functions argument list. Within multiple rhs arguments must be separated by comma.

* Select elements within vectors, matrices and lists. see help on extraction and insertion for more precisions

* [x1,x2,...]=(e1,e2,...) is equivalent to first performing %t_1 = e1, %t_2 = e2, ..., and then x1 = %t_1, x2 = %t_2, ..., where the variables %t_i, i = 1, 2, ... are invisible to the user.

Examples

3^(-1)
x=poly(0,"x");
//
(x+10)/2
i3=eye(3,3)
//
a=[1 2 3;4 5 6;7 8 9],a(1,3),a([1 3],:),a(:,3)
a(:,3)=[]
a(1,$)=33
a(2,[$ $-1])
a(:,$+1)=[10;11;12]
//
w=ssrand(2,2,2);ssprint(w)
ssprint(w(:,1))
ss2tf(w(:,1)) 
//
l=list(1,2,3,4)
[a,b,c,d]=l(:)
l($+1)='new'
//
v=%t([1 1 1 1 1])
//
[x,y,z]=(1,2,3)
 

See Also

colon  comma  brackets  list  extraction  insertion