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How to calculate standard deviation for a tag value in Vijeo Citect project?

For calculating the Standard Deviation in Citect, there is a inbuilt function is available " TableMath( ) ". You can use this in cicode as shown below:
REAL Array[5]=10,15,50,100,200;
REAL Result=0;
Result = TableMath(Array, 5,3,0);
STDEV = Result;
Where STDEV is a variable tag defined in the project, you need to call this StdDev() function using a button or in events.
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