 
 
 
21.5.13  Triangular window
The triangle_window
command applies the triangle window function to a sequence or its segment.
- 
triangle_window takes one mandatory argument
and up to three optional arguments:
- 
v, a real vector with length n.
- Optionally, one of:
- 
d, an integer in {−1,0,1} (by default, d=0).
- m,N ⟨,d⟩, a sequence of two integers
and optionally an integer d∈{−1,0,1} (by default, m=0 and N=n).
 
 
- triangle_window
returns the elementwise product of [vm,vm+1,…,vm+N−1]
and the vector w of length N defined by
| wk=1− | ⎪ ⎪
 ⎪
 ⎪
 ⎪
 ⎪
 ⎪
 |  | ⎪ ⎪
 ⎪
 ⎪
 ⎪
 ⎪
 ⎪
 | ,
   k=0,1,…,N−1. |  
 
The case d=−1 is called the Bartlett window function.
Example
| listplot(triangle_window([1$1000],1)) | 
 
 
