Difference between revisions of "LlListStatistics"

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m (added a smalll comment to the example script)
(Add an example showing expected results for each statistical operation on a sample list)
 
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|func_footnote=If a list entry type is not a float or an integer it is silently ignored.  
 
|func_footnote=If a list entry type is not a float or an integer it is silently ignored.  
 
|func_desc
 
|func_desc
|return_text=that is the result of performing statistical aggregate function '''operation''' on '''src'''.
+
|return_text=that is the result of performing statistical aggregate function {{LSLP|operation}} on {{LSLP|src}}.
 
|spec
 
|spec
 
|caveats
 
|caveats
Line 55: Line 55:
 
{{!}}}
 
{{!}}}
 
|examples=
 
|examples=
<lsl>
+
<source lang="lsl2">// Show results for each operation for a sample list
// shows just how bad SL is behaving and demonstrates the use of llListStatistics()
+
list dil_s;
+
list fps_s;
+
integer ticks;
+
+
 
default
 
default
 
{
 
{
     on_rez (integer parm)
+
     state_entry()
 
     {
 
     {
         llResetScript();
+
         list LX = [-1, 3.33, 17, "object", -4.5, 0.8675 ];
    }
+
 
 +
        llSay(0, "G.Mean= " + (string) llListStatistics(LIST_STAT_GEOMETRIC_MEAN, LX) );           // 0. 000000
 +
        llSay(0, "Max= " + (string) llListStatistics(LIST_STAT_MAX, LX) );                        // 17.000000
 +
        llSay(0, "Min= " + (string) llListStatistics(LIST_STAT_MIN, LX) );                        // -4.500000
 +
        llSay(0, "Mean= " + (string) llListStatistics(LIST_STAT_MEAN, LX) );                      // 3.139500
 +
        llSay(0, "Median= " + (string) llListStatistics(LIST_STAT_MEDIAN, LX) );                  // 0.867500
 +
        llSay(0, "Count= " + (string) llListStatistics(LIST_STAT_NUM_COUNT, LX) );                // 5.000000
 +
        llSay(0, "Range= " + (string) llListStatistics(LIST_STAT_RANGE, LX) );                    // 21.500000
 +
        llSay(0, "Std.Dev= " + (string) llListStatistics(LIST_STAT_STD_DEV, LX) );                // 8.258468
 +
        llSay(0, "Sum= " + (string) llListStatistics(LIST_STAT_SUM, LX) );                        // 15.697500
 +
        llSay(0, "Sum of squares= " + (string) llListStatistics(LIST_STAT_SUM_SQUARES, LX) );      // 322.091500
  
    changed(integer change)
 
    {
 
        if(change & CHANGED_REGION)
 
            llResetScript();
 
 
     }
 
     }
 +
}
 +
// Note that LSLEditor produces "NaN" (Not A Number) for the geometric mean above. Geometric mean applies only to numbers of the same sign.
 +
</source>
  
 +
<source lang="lsl2">// shows just how bad SL is behaving and demonstrates the use of llListStatistics()
 +
list dil_s;
 +
list fps_s;
 +
integer ticks = 0;
 +
 +
default
 +
{
 
     state_entry()
 
     state_entry()
 
     {
 
     {
        // set the timer to go off every other second
 
 
         llSetTimerEvent(1.0);
 
         llSetTimerEvent(1.0);
 
     }
 
     }
+
   
 +
    on_rez (integer parm)
 +
    {
 +
        llResetScript();
 +
    }
 +
   
 
     timer()
 
     timer()
 
     {
 
     {
 
         dil_s = llList2List(dil_s + llGetRegionTimeDilation(), -60, -1);
 
         dil_s = llList2List(dil_s + llGetRegionTimeDilation(), -60, -1);
 
         fps_s = llList2List(fps_s + llGetRegionFPS(), -60, -1);
 
         fps_s = llList2List(fps_s + llGetRegionFPS(), -60, -1);
 
+
         if(3 <= ++ticks)
         if(++ticks < 3)
+
 
         {
 
         {
 
             llSetText(
 
             llSetText(
                 "Dilation:"
+
                 "Dilation: min="+(string) llListStatistics(LIST_STAT_MIN, dil_s) + ", mean=" +
                + "\nmin = " + (string) llListStatistics(LIST_STAT_MIN, dil_s)
+
                    (string) llListStatistics(LIST_STAT_MEAN, dil_s) + ", max=" +
                + "\nmean = " + (string) llListStatistics(LIST_STAT_MEAN, dil_s)
+
                    (string) llListStatistics(LIST_STAT_MAX, dil_s) + ", std.dev=" +
                + "\nmax = " + (string) llListStatistics(LIST_STAT_MAX, dil_s)
+
                    (string) llListStatistics(LIST_STAT_STD_DEV, dil_s) + "\n" +
                + "\nstd.dev = " + (string) llListStatistics(LIST_STAT_STD_DEV, dil_s)
+
                    "FPS: min="+(string) llListStatistics(LIST_STAT_MIN, fps_s) + ", mean=" +
                + "\nFPS:"
+
                    (string) llListStatistics(LIST_STAT_MEAN, fps_s) + ", max=" +
                + "\nmin = " + (string) llListStatistics(LIST_STAT_MIN, fps_s)
+
                    (string) llListStatistics(LIST_STAT_MAX, fps_s) + ", std.dev=" +
                + "\nmean = " + (string) llListStatistics(LIST_STAT_MEAN, fps_s)
+
                    (string) llListStatistics(LIST_STAT_STD_DEV, fps_s),
                + "\nmax = " + (string) llListStatistics(LIST_STAT_MAX, fps_s)
+
                 <1.0, 1.0, 0.0>, //yellow
                + "\nstd.dev = " + (string) llListStatistics(LIST_STAT_STD_DEV, fps_s),
+
                1.0);
                 <1.0, 1.0, 0.0>, (float)TRUE);// yellow and opaque
+
 
         }
 
         }
 
     }
 
     }
}
+
   
</lsl>
+
    changed(integer change)
 +
    {
 +
        if(change & CHANGED_REGION)
 +
        {
 +
            llResetScript();
 +
        }
 +
    }
 +
}</source>
 
|helpers
 
|helpers
 
|also_functions=
 
|also_functions=

Latest revision as of 07:41, 13 January 2016

Summary

Function: float llListStatistics( integer operation, list src );

Returns a float that is the result of performing statistical aggregate function operation on src.

• integer operation a LIST_STAT_* flag
• list src

If a list entry type is not a float or an integer it is silently ignored.

Constant Description
LIST_STAT_RANGE 0 Calculates the range.
LIST_STAT_MIN 1 Calculates the smallest number.
LIST_STAT_MAX 2 Calculates the largest number.
LIST_STAT_MEAN 3 Calculates the mean (average).
LIST_STAT_MEDIAN 4 Calculates the median number.
LIST_STAT_STD_DEV 5 Calculates the standard deviation.
LIST_STAT_SUM 6 Calculates the sum.
LIST_STAT_SUM_SQUARES 7 Calculates the sum of the squares.
LIST_STAT_NUM_COUNT 8 Determines the number of float and integer elements.
LIST_STAT_GEOMETRIC_MEAN 9 Calculates the geometric mean.

Examples

// Show results for each operation for a sample list
default
{
    state_entry()
    {
        list LX = [-1, 3.33, 17, "object", -4.5, 0.8675 ];
 
        llSay(0, "G.Mean= " + (string) llListStatistics(LIST_STAT_GEOMETRIC_MEAN, LX) );           // 0. 000000
        llSay(0, "Max= " + (string) llListStatistics(LIST_STAT_MAX, LX) );                         // 17.000000
        llSay(0, "Min= " + (string) llListStatistics(LIST_STAT_MIN, LX) );                         // -4.500000
        llSay(0, "Mean= " + (string) llListStatistics(LIST_STAT_MEAN, LX) );                       // 3.139500
        llSay(0, "Median= " + (string) llListStatistics(LIST_STAT_MEDIAN, LX) );                   // 0.867500
        llSay(0, "Count= " + (string) llListStatistics(LIST_STAT_NUM_COUNT, LX) );                 // 5.000000
        llSay(0, "Range= " + (string) llListStatistics(LIST_STAT_RANGE, LX) );                     // 21.500000
        llSay(0, "Std.Dev= " + (string) llListStatistics(LIST_STAT_STD_DEV, LX) );                 // 8.258468
        llSay(0, "Sum= " + (string) llListStatistics(LIST_STAT_SUM, LX) );                         // 15.697500
        llSay(0, "Sum of squares= " + (string) llListStatistics(LIST_STAT_SUM_SQUARES, LX) );      // 322.091500
 
    }
}
// Note that LSLEditor produces "NaN" (Not A Number) for the geometric mean above. Geometric mean applies only to numbers of the same sign.
// shows just how bad SL is behaving and demonstrates the use of llListStatistics()
list dil_s;
list fps_s;
integer ticks = 0;
 
default
{
    state_entry()
    {
        llSetTimerEvent(1.0);
    }
 
    on_rez (integer parm)
    {
        llResetScript();
    }
 
    timer()
    {
        dil_s = llList2List(dil_s + llGetRegionTimeDilation(), -60, -1);
        fps_s = llList2List(fps_s + llGetRegionFPS(), -60, -1);
        if(3 <= ++ticks)
        {
            llSetText(
                "Dilation: min="+(string) llListStatistics(LIST_STAT_MIN, dil_s) + ", mean=" +
                    (string) llListStatistics(LIST_STAT_MEAN, dil_s) + ", max=" +
                    (string) llListStatistics(LIST_STAT_MAX, dil_s) + ", std.dev=" +
                    (string) llListStatistics(LIST_STAT_STD_DEV, dil_s) + "\n" + 
                    "FPS: min="+(string) llListStatistics(LIST_STAT_MIN, fps_s) + ", mean=" +
                    (string) llListStatistics(LIST_STAT_MEAN, fps_s) + ", max=" +
                    (string) llListStatistics(LIST_STAT_MAX, fps_s) + ", std.dev=" +
                    (string) llListStatistics(LIST_STAT_STD_DEV, fps_s),
                <1.0, 1.0, 0.0>, //yellow
                1.0);
        }
    }
 
    changed(integer change)
    {
        if(change & CHANGED_REGION)
        {
            llResetScript();
        }
    }
}

Notes

Given that this operation ignores any non-numbers in a list, it can be used to tell you, in a mixed list, how many of the elements in a list are numbers (when used with the LIST_STAT_NUM_COUNT parameter.)

See Also

Functions

•  llGetListEntryType

Deep Notes

Search JIRA for related Issues

Tests

•  llListStatistics Test

Signature

function float llListStatistics( integer operation, list src );