## 4.9 `PULSE`: Pulsed time dependent value

### 4.9.1 Syntax

`PULSE` args
`PULSE` iv pv delay rise fall width period

### 4.9.2 Purpose

The component value is a pulsed function of time.

### 4.9.3 Comments

For voltage and current sources, this is the same as the Spice `PULSE` function, with some extensions.
The shape of a single pulse is described by the following algorithm:

    if (time > _delay+_rise+_width+_fall){
      // past pulse
      ev = _iv;
    }else if (time > _delay+_rise+_width){
      // falling
      interp=(time-(_delay+_rise+_width))/_fall;
      ev = _pv + interp * (_iv - _pv);
    }else if (time > _delay+_rise){
      // pulsed value
      ev = _pv;
    }else if (time > _delay){
      // rising
      interp = (time - _delay) / _rise;
      ev = _iv + interp * (_pv - _iv);
    }else{
      // initial value
      ev = _iv;
    }

### 4.9.4 Parameters

`IV` = x
  Initial value. (required)
`PV` = x
  Pulsed value. (required)
`DELAY` = x
  Rise time delay, seconds. (Default = 0.)
`RISE` = x
  Rise time, seconds. (Default = 0.)
`FALL` = x
  Fall time, seconds. (Default = 0.)
`WIDTH` = x
  Pulse width, seconds. (Default = 0.)
`PERIOD` = x
  Repeat period, seconds. (Default = infinity.)