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How do I plot a scalar field along an arbitrary line in Nutils?
Yes, please.
Sure thing. Here's an example code snippet:

```
from nutils import mesh, function, plot, nurbs

# Define a curve to represent the line
curve = nurbs.curve([[-1, 0], [1, 0]])

# Generate a mesh along the curve
ns = function.Namespace()
ns.x = curve
domain, geom = mesh.rectilinear([numpy.linspace(0, 1, 10)])
ns.x = geom

# Set up an integrand
def integrand(x):
    return x[0]**2

# Plot the results
bezier = domain.sample('bezier', 2)
values = bezier.eval(integrand=integrand, arguments=ns)
plot.plot(bezier, values)
```