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The representations of the three functions are:
impulse(t) is the continuous time unit impulse applied at the origin whose graphical representation is an infinite vertical straight line, i.e., it reaches the border of the graphic for T = 0.
step(t) is the continuous time unit step applied at the origin as presented in the previous section.
ramp(t) is the continuous time unit ramp applied at th origin as presented in the previous section.
The operations are:
Sum – represented by +
Subtraction – represented by –
Product of a constatn and a function – represented by *
Product of two functions – represented by .*
Time shifting of a function – f(t -  ); ∈ ℜ
In order to create a new function, y(t), the three functions can be combined and constants can be used. The following example shows the use of two step functions, one applied at t = 0 and the other at t = 5 and the operation of subtraction.
Using the proposed syntax, it is written as:
It is submitted to SciLab as:
The SciLab result in graphical format is:
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