#+Title: some calc examples

#+BEGIN_SRC calc :var rho=7854 :var cp=434 :var r=0.05
  (rho*cp*r)
#+END_SRC

#+RESULTS:
: 170431.8

#+BEGIN_SRC calc :var r=0.10
  1/r
#+END_SRC

↑ before patch
----------------------------------------------------------------------
↓ after patch

#+BEGIN_SRC calc :var r=0.10
  1/r
#+END_SRC

#+RESULTS:
: 10.

#+BEGIN_SRC calc :var thi=20 :var tha=90 :var a=10 :var rho=7854 :var cp=434 :var r=0.05
tha - (tha - thi) * exp((-3.0*a)/(rho*cp*r))
#+END_SRC

#+RESULTS:
: 20.0123205598