select

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]}

t, yl and yh must be numbers or vectors with the same length as x

Result

A vector r with ...

r[i] = yl{[i]} if x[i] <= t{[i]} and

r[i] = yh{[i]} if x[i] > t{[i]}

The result r has the same length as x.

See also

vsubn, vsubc, vv

Example:

#a := eval vv(1,2,3,4,5)
#b := eval vmcol($#a, vv(5,4,3,2,1))
#c := vsubc($#a,0,3)
// -> vector: $#c = { 1 , 2 }
#d := eval vsubc($#a,2,0,5,$#b)
// -> matrix: $#d[*,0] = { 2 , 3 , 4 },  $#d[*,1] = { 4 , 3 , 2 }
#e := eval vsubc($#a,7,2,4)
// -> vector: $#e = { 1 , 2 , 4 , 5 }

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