strange behaviour when running a script via "run"

[John W. Eaton]

On 19-Apr-2009, Carlo de Falco wrote:

| Hi,
| 
| I have the following line in my .octaverc to load the sundials toolbox:
| 
| run /opt/sundials/2.3.0/sundialsTB/startup_STB.m
| 
| Since I built and installed the current mercurial tip on OSX this has  
| stopped working,
| I believe this is due to a strange behaviour when running scripts with  
| the "run" command.
| 
| For example with the following very simple script:
| 
| ---------------------------------------------------
|  >> type startup_STB
| startup_STB is the user-defined function defined from: /Users/carlo/ 
| Desktop/test/startup_STB.m
| 
| stb_path = '/opt/sundials/2.3.0';
| stb = fullfile(stb_path,'sundialsTB');
| printf(["stb=" stb "\n"]);
| printf(["stb=" stb "\n"]);
| ---------------------------------------------------
| 
| I get
| 
| ---------------------------------------------------
|  >> version
| ans = 3.1.55
|  >> run startup_STB.m
| stb=/opt/sundials/2.3.0/sundialsTB
| `stb' undefined near line 4 column 16
| error: called from `startup_STB' in file /Users/carlo/Desktop/test/ 
| startup_STB.m near line 4, column 1
| error: called from:
| error:   /Users/carlo/Desktop/OF/octave/octave-hg/scripts/ 
| miscellaneous/run.m at line 53, column 7
| ---------------------------------------------------
| 
| i.e. the variable "stb" exists when referenced in the first printf  
| command but it's undefined when printf is called the second time.
| If the script is launched directly, everything seems to work fine
| 
| ---------------------------------------------------
|  >> startup_STB
| /opt/sundials/2.3.0/sundialsTB
| /opt/sundials/2.3.0/sundialsTB
| ---------------------------------------------------

The following patch should fix the problem, but I haven't checked it
in yet because I'd like to think more about whether there is a better
way to handle scope changes like this.

jwe

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