vsubc

Extract rows from a vector or matrix.

Usage

vsubc(x , 0 , vmin {, y }})

vsubc(x , 1 , vmax {, y }})

vsubc(x , 2 , vmin, vmax {, y }})

vsubc(x , 3 , vmin, vmax {, y }})

x

condition vector (and source vector if argument y is not supplied); must be a vector!

vmin

lower boundary; must be a scalar or a vector with the same length as x

vmax

upper boundary; must be a scalar or a vector with the same length as x

y

optional source data; must be a vector or matrix with the same number of rows as x

Result

A numerical object consisting of all selected rows of the source y (or x if y is not supplied). The 2nd argument c must be a number in the range 0 to 3 and defines the condition used for the selection of the source rows.

c=0

select all rows i where x[i] < vmin

c=1

select all rows i where x[i] > vmax

c=2

select all rows i where vmin < x[i] < vmax

c=3

select all rows i where x[i] <= vmin or x[i] >= vmax

See also

vsubn, select, vv

Example:

#a := eval vv(1,2,3,4,5)
#b := eval vmcol($#a, vv(5,4,3,2,1))
#c := vsubn($#a,3)
// -> vector: $#c = { 4 , 5 }
#d := eval vsubn($#b, 1 , 3)
// -> matrix: $#d[*,0] = { 2 , 3 , 4 },  $#d[*,1] = { 4 , 3 , 2 }
#e := eval vsubn($#a, 2, 1)
// -> scalar: $#e = 2, this is equivalent to $#a[2]
#f := eval vsubn($#b, 2, 1)
// -> vector (!!): $#f = { 3 , 3 }, this is equivalent to $#b[2,*]

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