DERIV

Derivative

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

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