Get information from Unit Conversion (2024)

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Elisa am 3 Jul. 2024 um 10:33

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Kommentiert: Jeremy Huard vor etwa 2 Stunden

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Hi everyone, I am studying a simbiology model not made by me. In particular, I know that some parameters/species have inconsistent units, I just don't know which ones, since it's a huge model. While the Unit Conversion of Simbiology works perfectly, I'd like to know which parameters have different units; in other words I'd like to have a model with consistent units, that would work without using the unit conversion. It would also be sufficient to have, somehow, a table of the changes in units wrt a 'ground' unit, so that I can change the units manually.

I don't know if that's possible in simbiology and I haven't found any documentation on that.

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John D'Errico am 3 Jul. 2024 um 11:16

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Bearbeitet: John D'Errico am 3 Jul. 2024 um 11:31

Even without any knowledge of the tool, I seriously doubt it is possible. I could be wrong, but I think not. You might suggest it as a feature request, but you don't do that in Answers. Send your idea directly to tech support.

As for having a table of all changes made on the fly by the tool, I think that is even less likely to happen.

Elisa am 3 Jul. 2024 um 11:43

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Yes that's what I thought, but I guess proving the 'middle model' with consistent units could be something doable and it would be extremely useful when developing. Thank you for your quick reply by the way!

John D'Errico am 3 Jul. 2024 um 12:24

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You got the best possible result, actually, in the sense that you just got a response from someone on the staff. I hope it helps!

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Jeremy Huard am 3 Jul. 2024 um 12:13

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Bearbeitet: Jeremy Huard am 3 Jul. 2024 um 12:16

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Hi @Elisa,

I am curious about why you want to turn off unit conversion. Can you please explain the motivation behind it?

As for an implementation, one possible way to convert parameter units with your system of units could be as follows:

% export the model object to the MATLAB workspace from the Model Builder

% and keep Model Builder open

% create dictionary to map current/old units to new ground units

conversiondic = configureDictionary("string","string");

conversiondic("milligram") = "nanogram";

conversiondic("day") = "hour";

conversiondic("milliliter") = "liter";

% get parameter objects with a unit composed with one of the old units

parObj = sbioselect(modelObj,'Type','Parameter','Where','Units','function',...

@(x) contains(x,conversiondic.keys))

% convert units of each parameter

for currentPar=parObj'

oldunit = currentPar.Units;

% convert unit string to ground units

newunit = replace(oldunit,conversiondic.keys,conversiondic.values);

% convert parameter value to new units

sbioconvertunits(currentPar,newunit);

end

parObj

% the changes in units and values of these parameters will now be reflected

% in Model Builder as well.

% you can now keep working in the Model Builder Apps and save your project

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Elisa am 3 Jul. 2024 um 13:45

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Hi @Jeremy Huard I will try your solution for sure! The main reason is that I wanted to perform a identifiability analysis of the model with a MATLAB library (so not integrated in simbiology). I needed to figure out a method for having consistent units after exporting all the necessary info with getequations(). Thank you very much for your quick reply!

Jeremy Huard am 3 Jul. 2024 um 14:09

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Bearbeitet: Jeremy Huard vor etwa 6 Stunden

Thanks @Elisa.

Can you share which library? Is it related to your previous post?

I also wonder whether you have tried the Profile Likelihood method for practical parameter identifiability. It can be computed after a fit program using the Confidence Interval step in Model Analyzer or programmatically with sbioparameterci. Would this be an option?

Best,

Jérémy

Elisa vor etwa 4 Stunden

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Hi @Jeremy Huard, sorry for the late reply. Yes, it's always GenSSI (you can find the link to the repo in the previous post).

The SBML does not a perfect job in exporting the model, since simbiology supports several things that cannot be coded into SBML. I am parsing the result of getequation(), but it has been a pain changing the units of each parameter, I was interested in automating this task.

I've tried using the Profile Likelihood method, but sbioparameterci takes a long time to run (I'm talking > 30 hours), and I've suggested to use GenSSI instead for global and structural identifiability analysis.

Elisa

Jeremy Huard vor etwa 2 Stunden

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Thanks @Elisa for this info!

Calculating the Profile Likelihood CI can indeed be quite computationally expensive.

If you use the optimization-based method, increasing MaxStep and the Tolerance with a local optimizer might help. You could also try the integration-based method. In both cases parallel computing would help if you have access to the Parallel Computing Toolbox.

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Get information from Unit Conversion (2024)

FAQs

What information do unit conversions give? ›

A unit conversion expresses the same property as a different unit of measurement. For instance, time can be expressed in minutes instead of hours, while distance can be converted from miles to kilometers, or feet, or any other measure of length.

What is the easiest way to memorize unit conversions? ›

You can remember the order of the prefixes by using the following sentence: Good Morning King Henry Died By Drinking Chocolate Milk. Since the multiples and divisions of the base units are all factors of ten, you just need to move the decimal to convert from one to another.

How do you convert data units? ›

Converting data units involves multiplying or dividing the original value by the appropriate conversion factors to obtain the equivalent value in the target unit. The base unit of data storage, representing a single character or 8 bits.

What information does a unit give us? ›

Units of measure are how we express measurements of quantities. For length, the unit we would use in science is meters. A unit is really only a particular amount of some quantity used as a reference point for measurements of that quantity.

Why is it important to know about unit conversion? ›

Importance of Mathematical Conversions

In order to have accuracy and avoid confusion in measurement, we need to convert one unit to another. For instance, we do not measure the length of a pencil in kilometres. In such a case, one has to convert kilometre (km) to centimetre (cm).

What is the mnemonic for unit conversion? ›

The mnemonic “King Henry Died Drinking Chocolate Milk” gives students a funny, memorable way to keep the prefixes straight. The song includes an explanation of the following prefixes: kilo, hecto, deca, deci, centi, and milli.

What is the shortcut to learn the conversion of units? ›

Deci - 10 times smaller. Centi - 100 times smaller. Milli - 1,000 times smaller. A handy trick for remembering the basic metric prefixes is the mnemonic "King Henry Died Until Drinking Chocolate Milk," (or, if you prefer, "King Henry Doesn't Usually Drink Chocolate Milk").

What is the rule for unit conversion? ›

Use the basic conversion rule to solve any problem: from a larger unit to a smaller unit, multiply. From a smaller unit to a larger unit, divide. It's really that simple!

What are the 4 steps of conversion? ›

Recommendation 1: Enhance user experience at every touchpoint: In the realm of the 4 steps of conversion – attention, interest, desire, and action – user experience is king. Did you know that a one-second delay in page response can result in a 7% reduction in conversions (Source: Neil Patel)?

What is the formula for conversion? ›

The conversion rate is calculated by dividing the number of conversions by the total number of visitors. For example, if an eCommerce business received 1,000 site visitors in one month and received 50 customer orders, then the conversion would be 5.0% for the month.

Do you multiply or divide when converting units? ›

Rule 1: When converting from a larger unit to a smaller unit, multiply. Rule 2: When converting from a smaller unit to a larger unit, divide. This basic rule applies to all conversions, no matter the object being measured or the system you're using.

How to remember conversion of units? ›

The mnemonic way to remember the metric system is “King Henry Died Drinking Chocolate Milk” which gives us the funny memorable way to keep the prefixes straight. The statement includes an explanation of the following prefixes: kilo, hector, deca, centi and milli.

How do you convert units without a calculator? ›

Write the conversion as a fraction.

Write this conversion as a fraction, including units. Put the unit you start with on bottom (the denominator), and the unit you're converting to on top (the numerator). For example, write 2.54 cm/1 in.. You can read this as "2.54 centimeters per inch".

What method is used to convert units? ›

The factor–label method, also known as the unit–factor method or the unity bracket method, is a widely used technique for unit conversions that uses the rules of algebra.

What kind of information do unit conversions give brainly? ›

Expert-Verified Answer

Unit conversions give an equal amount but with other units. Hence, option C is correct.

Do you need to know unit conversions for SAT? ›

you do need to know common ones: like obviously 1 inch is 2.54 cm, obviously 1foot=12 inches, obviously 1 yard is 3 feet. But if SAT gives you one that's not so common, they'll tell u.

What do conversions measure? ›

Conversion rates are a percentage typically used in digital marketing to evaluate performance of website traffic, marketing campaigns and conversions. To calculate a conversion rate, take the number of conversions divided by the total number of visitors.

Why is it important to use the correct units of measurement when working with conversions? ›

It is important to use the correct units of measurement when working with conversions because units help us understand and compare quantities. Using the wrong units can lead to incorrect calculations and confusion. For example, when converting 5 feet into inches, we know that 1 foot is equal to 12 inches.

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