`expression.rweight(weight)`

The right scalar product of an expression by a weight.

Examples

In [1]:

import vcsn
c = vcsn.context('lal_char, q')

In [2]:

e = c.expression('<2>a<3>bc', 'trivial')
e

Out[2]:

$\left\langle 2 \right\rangle \,a \, \left( \left\langle 3 \right\rangle \,b \, c\right)$

In [3]:

e.rweight(c.weight('4'))

Out[3]:

$\left( \left\langle 2 \right\rangle \,a \, \left( \left\langle 3 \right\rangle \,b \, c\right)\right)\, \left\langle 4 \right\rangle$

Instead of e.rweight(w), you may write e * w.

In [4]:

e * c.weight('4')

Out[4]:

$\left( \left\langle 2 \right\rangle \,a \, \left( \left\langle 3 \right\rangle \,b \, c\right)\right)\, \left\langle 4 \right\rangle$

You may even run the simpler:

In [5]:

e * 4

Out[5]:

$\left( \left\langle 2 \right\rangle \,a \, \left( \left\langle 3 \right\rangle \,b \, c\right)\right)\, \left\langle 4 \right\rangle$