# DSP Toolbox : Array Plot Sample Increment Configuration for Simulink

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Hello,
I would like to know about the configuration settings suggestion for the Array Plot module present in the DSP System Toolbox for Simulink. The model design consists of a Discrete Sine Wave generator. The Sine wave source generates 1 Hz eqivalent 'Double' sine elements with a sampling time of (1/1000) seconds.
In the Array plot, Configuration properties: -
• X-Data mode = Sample Increment and X-Offset
• Sample Increment = (1/1000)
• X-Offset = 0
1. The resultant is stepwise plot of discrete elements representing the sine wave at x=0 for all sampling times. There is no x-displacement appearing in the array plot.
2. Second Attempt:
• X-Data Mode = Custom
• Sample Increment = linspace(1,100) % declared in MATLAB workspace as variable
Second Attemmpt, generates the same results as step 1.

Kiran Felix Robert on 26 Aug 2020
Hi Shashwat,
The Array plot block is used to plot vectors or arrays.
The X-axis shown in the array plot block is samples of different vectors at the same time-step. (The X-tick may or may not be integers though, depends on sample increment)
The x-axis is not the time step of your simulation nor the sample time of the input (signal) block.
For example,
If the input to Array plot block is a vector v = [1,2,3,4], and if you set the sample increment to 1, after the simulation
x-axis = 0 ,1 ,2, 3
y-axis = 1 ,2 ,3 ,4
will be the output of the Array Plot block.
The Discrete sine wave block generates a scalar output at every time step.
That is, at a given time step, input to the Array plot block is (a scalar or) a 1-element vector. So the array plot block, plots the entire sine wave at x=0 (which corresponds to vector 1), which you see at the end of your simulation.
Refer to this example for better understanding the operation of Array Plot.
To Visualize a discrete or a continuous sine wave, refer to the scope
Kiran Felix Robert

R2020a

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