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MathGroup Archive 1995

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Save/Get

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1717] Save/Get
  • From: Martin Rickli <Rickli at aut.ee.ethz.ch>
  • Date: Thu, 20 Jul 1995 22:36:33 -0400
  • Organization: Automatic Control Laboratory, ETH Zurich

Hi

Have you ever tried to save a protected symbol to a file and reload it
using Get? Unfortunately the sequence in which Mathematica writes
definitions to the file is - in above mentioned case - wrong: First the
protected attribute is saved and then other definitions. When you try to
reload you get a bunch of error messages (symbol protected)!

How about changing the order definitions are saved to file?

======================================================
In[33]:=
test[x_] = x^2;
Protect[test]

Out[34]=
{test}

In[35]:=
Save["xxx", test]

In[36]:=
!!xxx

Attributes[test] = {Protected}
 
test[x_] = x^2

In[37]:=
Unprotect[test]
Remove[test]

Out[37]=
{test}

In[39]:=
Get["xxx"]

From In[39]:=
Set::write: Tag test in test[x_] is Protected.

Out[39]=
 2
x

In[40]:=
??test

Global`test

Attributes[test] = {Protected}

======================================================
Your opinions are welcome.

Regards
Martin Rickli


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