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How to execute an Ocean command from a string

BobS893

Hi,

 I would like to generate a command as a string, perhaps based on local variables or something, and then run it in Ocean _as if_ I typed the contents of the string at an Ocean prompt.  If I denote the function I am looking for as OCN_COMMAND( input_string ) then running:

 OCN_COMMAND( "vtest = 5" )

will run, and after this there will be a variable named    vtest     with a value of 5.

A better example could be:  

 sprintf( str_to_run, "vtest = %d + %d", 5, 6 )

 OCN_COMMAND( str_to_run )

after these two lines, a variable    vtest   would be created and have the value of 11.  

I have seen similar abilities to run UNIX commands with the system( ) command, but not a means to generate commands within Ocean and then have it executed

Thanks in advance!

 Bob

  • Andrew Beckett

    Bob,

    evalstring() will do this. In general building code by creating strings and evaluating it is not usually the right way to do anything - I've seen all sorts of odd code done that way when there is a better approach. It would be good to know precisely what you are wanting to do here - the above is a very general description rather than the high level goal.

    Regards,

    Andrew

  • BobS893
    in reply to Andrew Beckett

    Andrew,

     This is exactly what I wanted, thank you!  Clearly I did not know that this function already existed.  As a more real-world example, sometimes when I am post-processing a set of data I may want to create a waveform with a more meaningful name, such as vout_n40_0p9 (representing an output waveform at a particular temperature corner), and within the post-processing loop I can create this meaningful string name.  Thus now I could form the string then use evalstring() to execute the command, so that later I can: plot( vout_n40_0p9 ) and know exactly which corner that pertains to.

    Thanks again!

    Bob

  • Andrew Beckett
    in reply to BobS893

    Hi Bob,

    In that case, I would do:

    sprintf(name "..." ...) ; so that name="vout_n40_0p9"
    measurement=...
    set(stringToSymbol(name) measurement)

    That way you're just using the set() function to set the variable. That would be cleaner than building commands as strings and then evaluating them.

    Andrew

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