DERIV

Block Screenshot

Contents

• Derivative

• • Palette

  • Description

  • Default properties

  • Example

  • Interfacing function

  • Computational function

  • Example

Palette

• Continuous time systems palette

Description

The Derivative block approximates the instantaneous derivative of its input with respect to time t.

It is a measure of how an output changes as its input changes Δu. The derivative is given by:

The derivative block has no setting and the initial output for the block is zero.

Default properties

• always active: no

• direct-feedthrough: yes

• zero-crossing: no

• mode: no

• regular inputs:

  - port 1 : size [-1,1] / type 1

• regular outputs:

  - port 1 : size [-1,1] / type 1

• number/sizes of activation inputs: 0

• number/sizes of activation outputs: 0

• continuous-time state: no

• discrete-time state: no

• object discrete-time state: no

• name of computational function: deriv

Example

In this example, we compute and display the derivative waveform of a sinusoidal input signal, with amplitude 2 and frequency 1.25 Hz.

The input and output waveforms of the DERIVATIVE block are shown below:

Interfacing function

• SCI/modules/scicos_blocks/macros/Linear/DERIV.sci

Computational function

• SCI/modules/scicos_blocks/src/c/deriv.c (Type 4)

Example