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Scilab help >> Xcos > palettes > Continuous time systems palette > DERIV



Block Screenshot


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

It is a measure of how a 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


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)


Ramine Nikoukhah - INRIA


<< CLSS Continuous time systems palette INTEGRAL_f >>

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Last updated:
Thu Mar 03 10:59:46 CET 2011