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Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

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Chapter 8 / Simulation<br />

_ _<br />

8.7.1.3 Parameter Change Facility<br />

When paused in STEP mode this facility allows the user to change any<br />

variable in the simulation that is not write protected. If a parameter is<br />

selected in the scrollable parameter selection area, the cursor automatically<br />

jumps to this field (bottom left box). If a new value is keyed in followed by<br />

the GCB variable selected is updated and displayed in<br />

the scrollable parameter selection area. If the left-hand mouse button is<br />

clicked over any other button within the window prior to entering the<br />

the variable value remains unchanged. Invalid entries,<br />

or changes to write protected variables, are rejected and a message to this<br />

effect is written to the scrollable text output area.<br />

8.7.1.4 RECD Facility<br />

This facility records unanticipated events. Activating this button changes it<br />

to green and starts the printing and plotting data facility (PRIPLO). The<br />

user provided time periods and frequencies in the external Characterisation<br />

file are ignored and the data requested is output at WIN_RATE.<br />

8.7.1.5 STAT Facility<br />

The interactive collection of statistical data on any variable is desirable<br />

when dealing with stochastic variables.<br />

Figure 8-10 : Statistical Analyser Window<br />

Activating the STAT button changes its indicator light to green, forces the<br />

simulation to enter step mode, and activates the pop-up window shown in<br />

Figure 8-10. This window contains a text field, selected for input using the<br />

left mouse button, into which any real GCB variable name can be keyed in<br />

followed by . The text is left justified, converted to<br />

upper-case characters, and variable statistics are collated at the windows<br />

refresh rate. If the variable name is not found the string in the text field is<br />

replaced by a warning message to this effect. When the simulation is restarted<br />

the mean, standard deviation and rms values are computed by<br />

VAR_STATS as defined in §22.2.7. Each time this window is activated all<br />

previous data is cleared except for the variable name. However, statistics<br />

8-22

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