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Currently, I'm implementing a Robot framework using the "Page object model".
Kindly let me know if there is another better model.
I would say that the answer depends on what is your system under test (SUT) and how large your test code will be. IMO, page object model is a good choice for SUTs that are systems with many views and you will have a large test automation code base.
If the code base is small, you don't have to think that much about maintainability and code re-usability.
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When should one consider using a metamodel in place of an expensive analysis component? I haven't actually seen an example of an openMDAO project that uses metamodels yet, so I was wondering if they're recommended or whether it's still best to treat expensive analyses like normal ones.
Using a metamodel is a trade-off. You trade accuracy vs execution time so it is up to you in your context.
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What were the design decisions that led to R having often more than one way of doing things, that have subtle difference? See, for a good example,
https://www.r-bloggers.com/r-na-vs-null/
More more such issues are here, some which are justified, some which are not http://r4stats.com/articles/why-r-is-hard-to-learn/
From a software engineering perspective, having such choices in a language screams for having subtle and hard-to-find bugs in your code (e.g. in Python the whole point of writing "pythonic" code, that avoids ambiguity and is easy to read and consistent in style). So there must be some major advantages of having that. What are they?
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I want to machine learn a statistical technique which isn't available currently in caret package. Is there any way that i can add this technique in library or tweak anything to machine learn an algorithm?
I basically want to machine learn instrumental variable regression. Is there any way to do it?
Absolutely,
There are 2 ways:
You contribute to the package repo in github or
Follow this tutorial
Hope it helps
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I have:
UI layer
Business Layer
Data access layer
Common code layer
When I need to, for example, perform string manipulation that is unique to the application and isn’t a candidate for common code. Where would you place this function?
Currently I have it in the controller but is does not feel right.
I would move it out of the controller but keep it within the MVC application, as it sounds like presentation logic. It could be a helper or maybe an extension method.
I would recommend you to make Common.UI, which will store all common things for Pressentation Layer in a separate project. In the future it will help you to switch between different pressentation layers and use same common features.
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Syntactically, at least, SQL is pretty far off. Thanks!
Dataphor's D4 is said to be pretty close (sole major error being the introduction of a null-like construct that the customers forced upon the developers, IIRC).
The projects listed on The Third Manifesto's project page ( http://www.dcs.warwick.ac.uk/~hugh/TTM/Projects.html ) should all be expected to abide even more closely.
There are the two syntactically very different languages: Relational Algebra and Relational Calculus, and SQL is a mixture of both. There are plenty of verbatim Relational Algebra implementations, so the matter obviously is not how "faithful" the implementation is.