DERIV
Derivative
Block Screenshot
![](/docs/2023.1.0/en_US/DERIV.png)
Description
The Derivative block approximates the instantaneous derivative of its input with respect to time t.
![y(t) = (u(t) - u(t-h)) / h](/docs/2023.1.0/en_US/_LaTeX_DERIV.xml_1.png)
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
Interfacing function
SCI/modules/scicos_blocks/macros/Linear/DERIV.sci
Computational function
SCI/modules/scicos_blocks/src/c/deriv.c (Type 4)
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:
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