This is A PREVIEW for NEST 3.0 and NOT an OFFICIAL RELEASE! Some functionality may not be available and information may be incomplete!

Write data to the terminal

When initially conceiving and debugging simulations, it can be useful to check recordings in a more ad hoc fashion. The recording backend screen can be used to dump all recorded data onto the console for quick inspection.

The first field of each record written is the node ID of the neuron the event originated from, i.e., the source of the event. This is followed by the time of the measurement, the recorded floating point values, and the recorded integer values.

The format of the time field depends on the value of the property time_in_steps. If set to false (which is the default), time is written as one floating point number representing the simulation time in ms. If time_in_steps is true, the time of the event is written as a value pair consisting of the integer simulation time step and the floating point offset in ms from the next grid point.


Using this backend for production runs is not recommended, as it may produce huge amounts of console output and considerably slow down the simulation.

Parameter summary


controls the number of decimal places used to write decimal numbers to the terminal.


A boolean (default: false) specifying whether to print time in steps, i.e., in integer multiples of the resolution and an offset, rather than just in ms.