func (m fm) Format(fs fmt.State, c rune) {
if c == 'v' && fs.Flag('#') {
fmt.Fprintf(fs, "%#v", m.Matrix)
return
}
mat.Format(m.Matrix, m.margin, '.', fs, c)
}
func (m Mat) Format(f fmt.State, c rune) {
mat64.Format(m, 0, 0, f, c)
}