Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
1

replace, not clone, a curve?

asked 2017-12-04 11:58:25 -0600

Matt Koch gravatar image

updated 2017-12-05 15:14:04 -0600

I was able to use an existing code snippet to create (or clone, if it already exists) a particular curve. However, if a curve of that name (say "Curve") already exists, then this will add another curve (say "Curve 1"), and each time this is called, there will be another (say "Curve 2", etc.) - the meaning of clone, I suppose.

library_Factor2 = curve.get.to_ModelObject.get.clone(model).to_CurveBiquadratic.get

Is there a way to replace (or first delete and then create) that curve, so that I will only ever have a curve named "Curve" in the model? Something like (hopefully it is that easy) the following, perhaps?

library_Factor2 = curve.get.to_ModelObject.get.replace(model).to_CurveBiquadratic.get

Where the replace function would either create or replace, not create or clone?

<<< EDIT <<<

OK, some progress, thanks. I did the following:

model_Curves = model.getCurveBiquadratics
model_Curves.each do |model_Curve|
  runner.registerInfo("Is x#{model_Curve.name}x equal to x#{curve_name}x?")
  if model_Curve.name == curve_name
    runner.registerInfo("Yes, x#{model_Curve.name}x is equal to x#{curve_name}x!")
    break
  end
end

Unfortunately, it does not quite work, as the result in the image below shows.

image description

It seems to me that "Trane CGAM-120-SE CAPFT" should have been caught and entered the above if comparison, but it does not seem to? Also, should I be able to enter the if comparison, I could then simply use

model_Curve.remove

Is that correct?

edit retag flag offensive close merge delete

Comments

1

Try if model_Curve.name.to_s == curve_name.

model_Curve.name is returning an object, so if you're checking equality with a string it won't work. You can make it a string with to_s.

Eric Ringold gravatar imageEric Ringold ( 2017-12-04 20:34:32 -0600 )edit

OK, so the following works, whereby model_Curve.name.get and model_Curve.name.to_s seem to give the same results.

    model_Curves = model.getCurveBiquadratics
    model_Curves.each do |model_Curve|
      runner.registerInfo("Is x#{model_Curve.name}x equal to x#{curve_name}x?")
      if model_Curve.name.get == curve_name.get
        runner.registerInfo("Yes, x#{model_Curve}x is equal to x#{curve.get}x!")
        runner.registerInfo("Yes, x#{model_Curve.name}x is equal to x#{curve_name}x!")
        model_Curve.remove
        break
      end
    end
Matt Koch gravatar imageMatt Koch ( 2017-12-05 07:18:52 -0600 )edit

... unfortunately, the model_Curve.remove part does not work. I suppose I cannot just delete the curve without also deleting it in the object that references it. I tried to do that with model_chiller.setCoolingCapacityFunctionOfTemperature(), but it does not let me do that. I know I could reassign all the curve entries if the curvealready exists, but the remove/clone approach seems to require less programming.

Matt Koch gravatar imageMatt Koch ( 2017-12-05 07:23:03 -0600 )edit

I'm confused at what the ultimate aim is. Are you trying to add a new curve that might already exist in the model? Or add a curve that is named the same as an existing curve, but contains different data?

Eric Ringold gravatar imageEric Ringold ( 2017-12-05 17:43:13 -0600 )edit

If you want to check if a curve named "Curve" exists in the model, you can test if model.getCurveByName("Curve").is_initialized returns true, and then not add an additional "Curve".

Eric Ringold gravatar imageEric Ringold ( 2017-12-05 17:50:58 -0600 )edit

2 Answers

Sort by ยป oldest newest most voted
3

answered 2017-12-04 14:19:08 -0600

Avi gravatar image

updated 2017-12-05 05:56:16 -0600

You could find your Curve by getting all the curves in the model and then finding the one named "Curve".

mycurves = model.getCurveBiquadratics
theCurve=[]
 mycurves .each do |mcurve|
 if mcurve.name.to_s == 'Curve'
     theCurve = mcurve
     break
 end
end

Then you can use the methods listed here to change the Curve. Alternatively, you could stay with the boost code you used and once you done with the first curve delete it using .remove and rename the new one to whatever you need.

edit flag offensive delete link more

Comments

OK, so I am trying the following:

model_curve = model.getCurveByName("Curve")
if model_curve.is_initialized()
  runner.registerInfo("Curve #{curve_name.get} is already initialized!")
  runner.registerInfo("Coefficient 1: #{model_curve.get.coefficient1Constant()}")
else
  runner.registerInfo("Curve #{curve_name.get} is not yet initialized!")
end

The decision towards "already initialized" or "not yet initialized" is made correctly. However, it fails at trying to display coefficient1Constant(). Am I misusing the "get" function? What would fix this?

Matt Koch gravatar imageMatt Koch ( 2017-12-11 11:23:22 -0600 )edit

You need to change to :

model_curve = model.getCurveByName("Curve")
 if model_curve.is_initialized()
      runner.registerInfo("Curve #{model_curve.get.name.to_s} is already initialized!")
      runner.registerInfo("Coefficient 1: #{model_curve.get.coefficient1Constant()}")
else
      runner.registerInfo("Curve #{model_curve.get.name.to_s} is not yet initialized!")
end

That is since model.getCurveByName returns boost object, then when you use the .get you translate it to curve object which then accept the normal methods (name etc.)

Avi gravatar imageAvi ( 2017-12-12 01:25:12 -0600 )edit
2

answered 2017-12-12 09:56:40 -0600

Matt Koch gravatar image

Yes, in the end, I was able to do initialization checks on these entities:

  model_curve_check = model.getCurveByName(curve_name.get)
  library_curve_check = library_model.getObjectByTypeAndName(OpenStudio::Model::CurveBiquadratic::iddObjectType,curve_name.get)

And if these curves exist, I can do any work I want on them by doing the following:

if model_curve_check.is_initialized and library_curve_check.is_initialized then
  model_curve = model_curve_check.get.to_CurveBiquadratic.get
  library_curve = library_curve_check.get.to_CurveBiquadratic.get

  library_coefficient1 = library_curve.coefficient1Constant()

  if library_coefficient1 != "" then
    model_curve.setCoefficient1Constant(library_coefficient1)
  end

  model_chiller.setCoolingCapacityFunctionOfTemperature(model_curve)
end

And if only the library curve exists, then I do the following:

if not model_curve_check.is_initialized and library_curve_check.is_initialized then
  library_curve = library_curve_check.get.to_ModelObject.get.clone(model).to_CurveBiquadratic.get

  model_chiller.setCoolingCapacityFunctionOfTemperature(library_curve)
end

I even encapsulated this in its own function, one for biquadratic, one for quadratic.

This seems to work reasonably well now.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

 

Question Tools

1 follower

Stats

Asked: 2017-12-04 11:58:25 -0600

Seen: 82 times

Last updated: Dec 12