inclusion of #+RESULTS in a source block

inclusion of #+RESULTS in a source block

[Federico Beffa]

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  Suppose you want to use a program such as Sympy or Maxima to find
  the analytic solution of a complicated equation. After this you want
  to make use of that solution for numerical evaluation of various
  cases.

  Is it safe to use the analytic results (without using a session) in the
  following way, or is there a better way?

  #+NAME: analytic-sol
  #+BEGIN_SRC python :session none :results raw
    from sympy import symbols, sqrt, python, solve
    x, a = symbols("x, a")
    y = solve( x**2 + 2*a*x + 1, x)
    return python(y)
  #+END_SRC

  #+NAME: numeric-sol
  #+BEGIN_SRC python :session none
    from sympy import Symbol, sqrt, lambdify
    import numpy as np

    #+RESULTS: analytic-sol
    a = Symbol('a')
    e = [-a - sqrt(a**2 - 1), -a + sqrt(a**2 - 1)]

    f = lambdify(a, e[1], "numpy")
    t = np.r_[1:4]
    return f(t)
  #+END_SRC

  #+RESULTS:
  | -1 | -0.26794919 | -0.17157288 |

Regards,
Fede

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Re: inclusion of #+RESULTS in a source block

[Charles Berry]

Federico Beffa <beffa <at> ieee.org> writes:

> 
> 
> 

>   Suppose you want to use a program such as Sympy or Maxima to find
>   the analytic solution of a complicated equation. After this you
>   want to make use of that solution for numerical evaluation of
>   various cases.  


See 

http://orgmode.org/manual/Noweb-reference-syntax.html#Noweb-reference-syntax

You want something like

#+BEGIN_SRC python :noweb yes
<<analytic-sol()>>
#+END_SRC


To use in more than one src-block  use the `:cache yes' header for 
`analytic-sol'

HTH,

Chuck