func SubNorm64(a []float64, nfunc Func64) {
	nv := nfunc(a)
	AddVec64(a, -nv)
}
SubNorm64 does subtractive normalization by given norm function
i.e., it subtracts norm computed by given function from each element.
package norm
import (
	"math"
	"github.com/goki/ki/kit"
	"github.com/goki/mat32"
)
func DivNorm32(a []float32, nfunc Func32) {
	nv := nfunc(a)
	if nv != 0 {
		MultVec32(a, 1/nv)
	}
}
func DivNorm64(a []float64, nfunc Func64) {
	nv := nfunc(a)
	if nv != 0 {
		MultVec64(a, 1/nv)
	}
}
func SubNorm32(a []float32, nfunc Func32) {
	nv := nfunc(a)
	AddVec32(a, -nv)
}