MATLAB: Blocking Probabilty

blocking probabilitym/m/1queuesSimEvents

Hello guys, I am using M/M/1 simevent demo and I am happy with the result I am getting(i.e. Average waiting, Number of Packets in the queue and utilization). The problem however I can't get the blocking probability, Any body have any idea?. Thank you.

Best Answer

In general, you can use any of the statistics from the server, feed them into a Discrete-Event Subsystem (DESS) from the SimEvents / Ports and Subsystems library, and inside the DESS use any Simulink Math blocks to compute a desired result from this, if you know the formula.

I think for blocking probability you would need the server utilization, and probably the queue capacity. If so, the former can be obtained from the server block, and for the latter, use a Constant block inside the Discrete-Event Subsystem with constant value equal to queue capacity.

Disclaimer: Not sure about the correct formula for blocking probability. You'll have to look that up.

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MATLAB: Block cannot cross a non-virtual subsystem boundary, since both blocks are part of the same discrete-event system.

I don't think it is allowed. From this documentation here, "The entire discrete-event subsystem, which includes all discrete-event blocks, must reside entirely within the atomic subsystem. You cannot route entities into, or out of, the atomic subsystem."

MATLAB: Probabilty occurence of a number in long number sequence

X = randi(256,1,300)-1;       % Data on [0 255]
P = histc(X,0:255)/length(X); % Probabilities.
[(0:255).' P(:)]  % Show the probabilities.
plot(0:255,P)

If you only want to see the probabilities that are nonzero:

Y = 0:255;
Y = Y(logical(P));
P = P(logical(P));
[Y(:) P(:)]

Best Answer

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MATLAB: Block cannot cross a non-virtual subsystem boundary, since both blocks are part of the same discrete-event system.

MATLAB: Probabilty occurence of a number in long number sequence

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