user_guide:tutorials:data

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tutorial:data [2017/07/24 22:21] – [Handling arbitrary files] fixed a bug oroehriguser_guide:tutorials:data [2019/02/11 16:43] – ↷ Links adapted because of a move operation oroehrig
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 To store polymake objects use the command To store polymake objects use the command
   > save($p,"myPolyObject.poly");   > save($p,"myPolyObject.poly");
 +This silently overwrites existing files.
 +  
 polymake objects that are stored in polymake's own XML file format can be loaded via polymake objects that are stored in polymake's own XML file format can be loaded via
   > $p=load("myPolyObject.poly");   > $p=load("myPolyObject.poly");
-If you did not start ''polymake'' in the directory containing your object, it is necessary to add the relative path, e.g.+If you did not start ''polymake'' in the directory containing your object, it is necessary to add the relative or absolute path, e.g.
   $p=load("MyFolder/myPolyObject.poly");   $p=load("MyFolder/myPolyObject.poly");
 +TAB completion like in a usual UNIX shell supports you in navigating through the file system.
 +
 +
 **Note:** If you load a polymake object and compute new properties, these properties will automatically be added to the original XML-file at the end of the session. You can suppress this with the command  **Note:** If you load a polymake object and compute new properties, these properties will automatically be added to the original XML-file at the end of the session. You can suppress this with the command 
   > $p->dont_save;   > $p->dont_save;
-called prior to leaving the session (but after the last compuation with $p).+called prior to leaving the session (but after the last computation with $p).
  
 +
 +If you want to store a collection of objects into a single file, there is an [[..:howto:tarballs|extra tutorial]] for you.
 ===== Handling complex data types ===== ===== Handling complex data types =====
  
-It is also possible to store complex data structures in XML format via ''save_data'', e.g.+Apart from the full objects, you can also persistently store arbitrary data structures like matrices or graphs in XML format via ''save_data'', e.g.
   > $s=new Set<Int>(1,2,3,4);   > $s=new Set<Int>(1,2,3,4);
-  > save_data($s,"mySet.poly");+  > save_data($s, "mySet.poly", "My very own set."); 
 +The description text is optional; it can be an arbitrary text, even stretching over several lines. 
 To load such files just type To load such files just type
   > $s=load_data("mySet.poly");   > $s=load_data("mySet.poly");
 +===== Saving visualized objects =====
 +Furthermore, most visualization methods provide an option to save the visualized object in a suitable format. Consult the [[user_guide:intro_tutorial#getting_help|F1 help]] for information on the file format and further options.
 +
 +To save the cube visualized via JReality in a new file called ''mycube.bsh'', do this:
 +<code>jreality(cube(3)->VISUAL,File=>"mycube");</code>
 +To save the cube as a TiKz file named ''mycube.tikz'' that you can e.g. import in a LaTeX document, do this instead:
 +<code>tikz(cube(3)->VISUAL,File=>"mycube");</code>
  
 ===== Handling arbitrary files ===== ===== Handling arbitrary files =====
  • user_guide/tutorials/data.txt
  • Last modified: 2019/02/11 16:43
  • by oroehrig