Programmer Guide/Command Reference/EVAL/select: Difference between revisions
From STX Wiki
< Programmer Guide | Command Reference | EVAL
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 12: | Line 12: | ||
:The result r has the same length as ''x''. | :The result r has the same length as ''x''. | ||
;See also: | ;See also: [[Programmer_Guide/Command_Reference/EVAL/vsubc|vsubc]], [[Programmer_Guide/Command_Reference/EVAL/limit|limit, limitlow, limithigh]] | ||
Example: | Example: | ||
Revision as of 12:31, 6 April 2011
Conditional merge of selected elements of two vectors and/or scalars.
- Usage
select(x, t, yl, yh)- x
- condition vector; must be a vector!
- t
- threshold
- yl
- result if
x[i] <= t{[i]} - yh
- result if
x[i] > t{[i]}
- Note: t, yl and yh must be numbers or vectors with the same length as x
- Result
- A vector r with ...
r[i] = yl{[i]}ifx[i] <= t{[i]}andr[i] = yh{[i]}ifx[i] > t{[i]}
- The result r has the same length as x.
- See also
- vsubc, limit, limitlow, limithigh
Example:
#a := eval vv(1,2,3,4,5,4,3,2,1)
#b := eval fill(9,0,1)
#c := eval select($#a,3,0,$#a)
// -> $#c = { 0 , 0 , 0 , 4 , 5 , 4 , 0 , 0 , 0 }
#d := eval select($#a, $#b , $#b , $#a)
// -> $#d = { 1 , 2 , 3 , 4 , 5 , 5 , 6 , 7 , 8 }
#e := eval select($#b%2, 0, $#b, -1)
// -> $#d = { 0 , -1 , 2 , -1 , 4 , -1 , 6 , -1 , 8 }
