Main

## Main.OptionApmEvType History

June 09, 2017, at 12:01 AM by 10.5.113.159 -
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%width=50px%Attach:apm.png [[Main/DbsGlobal|Global Options]] | %width=30px%Attach:fv.png %width=30px%Attach:mv.png %width=30px%Attach:sv.png %width=30px%Attach:cv.png[[Main/DbsVariable|Local Options]]
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June 02, 2017, at 06:13 AM by 45.56.3.173 -

June 01, 2017, at 01:52 PM by 45.56.3.173 -
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Description: Estimated variable error model type: 1=linear, 2=squared, 3=approximate linear
to:
Description: Estimated variable error model type
1=linear error, abs(model-measured) with slacks
2=squared error, (model-measured)^2
3=approximate linear without slack variables
June 01, 2017, at 01:51 PM by 45.56.3.173 -
(:title APM.EV_TYPE - APMonitor Option:)
(:keywords APM.EV_TYPE, Optimization, Estimation, Option, Configure, Default, Description:)
(:description Estimated variable error model type: 1=linear, 2=squared, 3=approximate linear:)

%width=50px%Attach:apm.png

Type: Integer, Input
Default Value: 1
Description: Estimated variable error model type: 1=linear, 2=squared, 3=approximate linear

EV_TYPE applies a specific objective function. Linear is an l1-norm, or in other words the solver minimizes the sum of the absolute value of the difference between the CV and the set point. Squared is an l2-norm or sum squared error (SSE), or in other words the solver minimizes the sum of the squared difference between the CV and the set point. l1-norm can be useful when noise or measurement error is expected because it better rejects those. Option 3 is not typically used as an approximate absolute value function that uses a nonlinear function instead of slack variables.