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2014/04/18

Fixed points of conversion between integer and floating-point number

Among interesting topics in HAKMEM, there is an item about a fixed point: Item 174 (Bill Gosper and Stuart Nelson)

So what's a modern variation of it? A simple minded one is on conversion between int32_t (or int64_t) and float (or double, respectively). Although IEEE 754 does not specify the memory layout of its floating-point representation, we can do an experiment for the problem in a particular processor anyway.

Unfortunately the IA-32 case has no non-trivial solution except obvious 0. See a discussion about the same problem.

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2014/04/03

Repeatability, replicability, reproducibility, oh my!

We often see a word "reproducibility" in a scientific context, as well as in a bug report of a software, and we know it plays an important role at analysing an uncertainty. But wait, there are a couple of similar things aside; "repeatability" and "replicability". How they are different from each other?

Here are corresponding articles in Wikipedia:

Do you distinguish between them clearly now? Not really, at least to me. It seems harder than expected as the following papers matters:

The last one indicates that it is helpful for reproducible research to make repeating/replicating an experiment easier with make(1).

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