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May I know which of the following sentences is grammatical?

  1. This method named ABC is used to calculate the temperature of these categories of objects.

  2. This method named as ABC is used to calculate the temperature of these categories of objects.

  3. This method, named ABC, is used to calculate the temperature of these categories of objects.

  4. This method, named as ABC, is used to calculate the temperature of these categories of objects.

In sentences 3 and 4, I added commas.

In sentences 2 and 4, I inserted the word as.

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  • You're varying two things: 1. whether you put the phrase in commas; and 2. whether you insert the word "as". So really, there are four possibilities here: +commas +as, +commas -as, -commas +as, -commas -as.
    – user230
    Oct 14, 2013 at 1:53
  • I'm going to insert the other two possibilities into your question. If you feel that was a mistake, please feel free to roll the change back :-)
    – user230
    Oct 14, 2013 at 1:58
  • Named alone is correct as @chrylis (below) said. No matter how well we punctuate it.
    – VijayaRagavan
    Oct 14, 2013 at 10:14

2 Answers 2

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Using as isn't strictly ungrammatical, but it's not standard usage in this sort of sentence; just use named ABC.

You should use the commas. In this sentence, named ABC is what's called non-restrictive: It doesn't serve to limit the identification of method, whose identity is already clear. Non-restrictive phrases, like this one, are set off in commas; you could strike out everything between the commas, and the sentence would still be clear. Restrictive phrases are necessary to properly identify the item being described and are not set off in commas.

Examples

This method, named ABC, is used to calculate the temperature of these categories of objects.

The demonstrative adjective This clearly identifies which method you're talking about, so named ABC is extra information that's not required for the sentence to make sense.

The method named ABC is used to calculate the temperature of these categories of objects.

Unless which method is clear from the context, you need named ABC so the reader can tell which method you're talking about, so the phrase is restrictive; no commas.

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The phrase "named as XYZ" means something quite different; it means the person has been identified by name as someone who is XYZ. For example:

My brother is named as a beneficiary in my will.

If you want to say that someone's name is XYZ, just use "named XYZ".

My brother is named Will.

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