`expression``.lweight(weight)`¶

The left scalar product of an expression by a weight.

See also:

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.lweight(c.weight('4'))

Out[3]:

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

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

In [4]:

c.weight('4') * e

Out[4]:

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

You may even run the simpler:

In [5]:

4 * e

Out[5]:

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