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package dstream
import "fmt"
type convert struct {
xform
// The name of the variable to be converted
vname string
// The position of the variable to be converted
vpos int
// The new type of the variable
dtype Dtype
}
// Convert returns a Dstream in which the named variable is converted
// to the given type.
func Convert(da Dstream, vname string, dtype Dtype) Dstream {
vpos := -1
for k, na := range da.Names() {
if na == vname {
vpos = k
break
}
}
if vpos == -1 {
msg := fmt.Sprintf("Convert: no variable '%s'\n", vname)
panic(msg)
}
c := &convert{
xform: xform{
source: da,
},
vname: vname,
dtype: dtype,
vpos: vpos,
}
c.bdata = make([]interface{}, c.source.NumVar())
return c
}
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