diffcalc | diffraction condition calculator for X-ray or neutron | Data Manipulation library
kandi X-RAY | diffcalc Summary
kandi X-RAY | diffcalc Summary
Diffcalc: a diffraction condition calculator for X-ray or neutron diffractometer control
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QUESTION
So in an attempt to better understand MSVC++'s implementation of rand
, I re-implemented it and attempted to better understand it (and LCGs in general I guess).
My implementation (which matches MSVC++'s almost exactly) is as follows:
...ANSWER
Answered 2017-Jul-07 at 01:21The difference between the new seeds is indeed 214013*h
.
That gives the seeds s
and s + 214013*h
, the difference between the resulting random outputs would be (before simplification) diff = ((s + 214013*h >> 16) & 0x7fff) - ((s >> 16) & 0x7fff)
. The question is then essentially, is this expression independent of s
.
It is not. For example, even taking h = 1
, diff
can be either 3 (eg s = 0
) or 4 (eg s = 0x0000bc03
).
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Install diffcalc
You can use diffcalc like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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