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

[Elendurwen]

Hi, when the simulator starts, it outputs something like

Code: Select all

[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:

Code: Select all

outputFileGlobal << ???

Thanks!

[pincy]

Hi Elendurwen,

If you type

Code: Select all

$ argos3 -h

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

Code: Select all

$ 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:

Code: Select all

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

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

Code: Select all

$ 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:

Code: Select all

CSimulator::GetInstance().GetRandomSeed()

Cheers,
Carlo