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Re: [ddlm-group] Complex numbers
- To: [email protected], Group finalising DDLm and associated dictionaries<[email protected]>
- Subject: Re: [ddlm-group] Complex numbers
- From: "Herbert J. Bernstein" <[email protected]>
- Date: Mon, 16 Jun 2025 06:57:14 -0400
- Cc: Daniel Paley <[email protected]>, ddlm-group <[email protected]>, Aaron Brewster <[email protected]>
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- In-Reply-To: <CAM+dB2cTYn9QF==o6ctaT5X+5NDgy0sqwd4m2X4SjTGLKsmH6A@mail.gmail.com>
- References: <CAM+dB2cTYn9QF==o6ctaT5X+5NDgy0sqwd4m2X4SjTGLKsmH6A@mail.gmail.com>
I would suggest handling real, complex and quaternion in one unified notation using i, j, and k for the three square roots of -1 following the
conventions in the wikipedia article, https://en.wikipedia.org/wiki/Quaternion, and the Frobenius theorem.
Regards,
Herbert
On Mon, Jun 16, 2025 at 2:13 AM James H <[email protected]> wrote:
_______________________________________________Dear DDLm group,We currently do not define a format for complex or imaginary numbers either in the CIF2 syntax or in the DDL dictionary. I would like to suggest that we enhance the DDL dictionary to state that, where a format does not have a native definition for complex numbers, they should be formed as <R>+/-<I>j, where <R> and <I> are real numbers (the real and imaginary parts respectively). This is the Python syntax. I'd suggest we don't allow appended su for R and I in the case of complex numbers, instead allowing only a separate _su data name. But happy to be overruled on that one.Any objections?James.--T +61 (02) 9717 9907
F +61 (02) 9717 3145
M +61 (04) 0249 4148
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