## SYNOPSIS

`spike2sdf`

**fname**

**period**

**sigma**

**restrict_window**

## DESCRIPTION

Spike2sdf computes spike density function for a spiking timeline, sampling
every **period** using a Gaussian with **sigma** considering
spikes from **restrict_window** msec centred at sampling point.

SDF is calculated as a sum of exp(- dt_i^2 / sigma^2), where dt_i is sampling point to spike time distance.