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[ddlm-group] Complex numbers

  • To: ddlm-group <[email protected]>
  • Subject: [ddlm-group] Complex numbers
  • From: James H <[email protected]>
  • Date: Mon, 16 Jun 2025 16:13:25 +1000
  • DMARC-Filter: OpenDMARC Filter v1.3.2 mailserver.iucr.org 6BB665A1909
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.
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