A double threshold function. When you use this function, you define two threshold values, and enter these into the 窶彭窶 and the 窶彳窶 fields. It is not necessary to enter the thresholds in a particular order. To avoid confusion, however, we recommend that you let 窶彭窶 be the smaller threshold and 窶彳窶 be the larger threshold.
If the input value is greater than or equal to the larger threshold, the output value is equal to the 窶彗窶 parameter. If the input value is less than the larger threshold and greater than or equal to the smaller threshold value, the output value is equal to the 窶彙窶 parameter. If the input value is less than both the threshold values, the output value is equal to the 窶彡窶 parameter.
Note that the 窶彗窶 parameter does not need to be greater than the 窶彙窶 or the 窶彡窶 parameters. Moreover, the 窶彙窶 parameter does not have to be greater than the 窶彡窶 parameter.