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Sometimes a certain part of an object's code may need to be repeated many times. Even the number of repetitions may be required to be determined by the user. In short, the Repeat Object is used to clone a series of objects multiple times.

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• S (start)

• E (end)

• I (increment)

• CTRL (control parameter)

Syntax

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<O T="Repeat"
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</O>

Example

Code Block language xml <O N="Replicate" T="Project" Category="Core Objects"> <!-- created by ParamML Examples on 26.01.2023 --> <O N="Recap" T="Repeat" S="0" E="3" I="1" CTRL="j" j="0"> <P N="Result" V="3^jpow(3,j)" /> </O> <O T="Design Code"> <P N="RecapObjectList" V="Recap" /> <P N="RecapResult0" V="Recap[0].Result" /> <P N="RecapResult1" V="Recap[1].Result" /> <P N="RecapResult2" V="Recap[2].Result" /> <P N="RecapResult3" V="Recap[3].Result" /> <!-- -l- --> <P N="Result0" V="3^0pow(3,0)" /> <P N="Result1" V="3^1pow(3,1)" /> <P N="Result2" V="3^2pow(3,2)" /> <P N="Result3" V="3^3pow(3,3)" /> </O> </O>

The above codes give exactly the same results as below.

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To view this example in the library, see (https://openbrim.org/platform/?application=inc&author=ParamML_Examples_OpenBrIM+Platform&folder=Core+Objects&obj=objidr5mrcuyfnw8mxik04obc)

ParamML is a programming language that employs lazy evaluation (https://en.wikipedia.org/wiki/Lazy_evaluation ), where each parameter is only computed when it is called. Unlike sequential programming (e.g., http://VB.NET ), where each line is executed one by one, ParamML doesn't compute every parameter upfront. However, a drawback is that if a parameter is called a thousand times, it needs to be computed a thousand times, which can be a significant performance issue.

To address this problem, caching is used (https://en.wikipedia.org/wiki/Cache_(computing) )."Repeat" is a specific object, and under normal circumstances, due to software limitations, we cannot employ caching within "repeat." This is where "StaticParams" comes into play. StaticParams overrides this rule. The parameters written within StaticParams are computed, and their values are manually added to the cache. As a result, when attempting to access these parameters within "repeat," there is no need to reevaluate the parameters; their values are readily available in the cache.

Example:

<O N="StaticParamsObject1" T="Project" Category="Core Objects">
    <!-- created by ParamML Examples on 8/29/2023 -->
    <P N="StaticParameters" V="10" />
    <O T="Repeat" S="0" E="2" I="1" CTRL="index" index="0" StaticParams="[StaticParameters]">
        <P N="width" V="StaticParameters" />
        <P N="depth" V="StaticParameters" />
        <O N="Rectangular Column" T="Line">
            <O T="Point" X="index * 15" Y="0" Z="0" />
            <O T="Point" X="index * 15" Y="0" Z="width" />
            <O N="Rectangular" T="Section">
                <O T="Shape">
                    <O T="Point" X="-width/2" Y="-depth/2" Z="0" />
                    <O T="Point" X="-width/2" Y="depth/2" Z="0" />
                    <O T="Point" X="width/2" Y="depth/2" Z="0" />
                    <O T="Point" X="width/2" Y="-depth/2" Z="0" />
                </O>
            </O>
        </O>
    </O>
</O>

To view this example in the library, see (https://openbrim.org/platform/?application=inc&author=ParamML_Examples_OpenBrIM+Platform&obj=objidro1flg1c11lprm05wr6kzo )

Parameters of Repeat Object

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