The ARGoS Forum

Posted: **Fri Apr 24, 2015 9:00 pm**

Hi, when the simulator starts, it outputs something like

[INFO] Not using threads
[INFO] Using random seed = 263127
[INFO] Using simulation clock tick = 0.1
[INFO] Total experiment length in clock ticks = unlimited
[INFO] The physics engine "dyn2d" will perform 10 iterations per tick (dt = 0.01 sec)

I would like to get the value of that random seed and save it a file from my loop function, when it initialises. Or at least get all the info and save it. This is so that if I find a bug in a specific simulation run, I just re-run that particular case.

I couldn't find a way to do it, is there one? I have the output stream setup, I just need to fill in the following line:

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outputFileGlobal << ???

Thanks!

Posted: **Sat Apr 25, 2015 8:26 pm**

Hi Elendurwen,

If you type

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$ argos3 -h

you'll see that there are two options to redirect [INFO] (stdout) and [WARNING] / [ERROR] (stderr) to file. The syntax is:

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$ argos3 -l INFOFILE -e ERRORFILE -c myexperiment.argos

By default, the output contains extra control characters to color the output green and red. You can prevent ARGoS from outputting these characters by passing the additional option -n:

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$ argos3 -n -l INFOFILE -e ERRORFILE -c myexperiment.argos

Once you have your INFOFILE, you can find the random seed with this one-liner:

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$ grep 'random seed' INFOFILE | cut -d' ' -f6

Alternatively, you can get the value of the current random seed directly from C++, e.g., within the loop functions. To achieve this, you can write:

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CSimulator::GetInstance().GetRandomSeed()

Cheers,
Carlo

The ARGoS Forum

Writing the simulator's random seed or initial log into a file

Writing the simulator's random seed or initial log into a file

Re: Writing the simulator's random seed or initial log into a file