code: def j0(ctx, x):
      """Computes the Bessel function `J_0(x)`. See :func:`~mpmath.besselj`."""
      return ctx.besselj(0, x)
  
imports: from .functions import defun, defun_wrapped
label_desc: Use image node_id 1 for calling a global function with example usage: j0(ctx, x) and returns: ctx