how should a program ask for no SI prefix?
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11-24-2015, 03:14 PM
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how should a program ask for no SI prefix?
With SI written units, the absence of an SI prefix is indicated by a null: as in "m" instead of "mm".
I may have missed it (I have only looked at free specs) but I have not seen an equivalent that would suit a program. If I have a pop-up selector (CHOOSE or INPUT) prompting for K,M,G,... how should I signify " no prefix"? Which will probably be the default. The problem with "no prefix" is: - its longer than K, so might not fit your form - it needs translation - The opposite of "no prefix" is "a prefix", not a specific one. Using a null entry (equivalent to the written " m" for metres) is inconvenient, particularly on the HP Prime: There is no clue that this is your prefix input rather than something else, and HP Prime's default prompt is for a value - the inexperienced user is likely to try to type in a number rather than select a choice. For mathematical users one might avoid translation by using a number but even this can be confusing. Should one specify " 1" as in multiply by 1,1000,1000000? Or should one specify ^0 as in 1e6,1e3,1e0? Of course either could be used - but are there any hints as to what works and what doesn't? Does the SI organisation have any recommendations? (And if not, why not?) Stephen Lewkowicz (G1CMZ) https://my.numworks.com/python/steveg1cmz |
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Messages In This Thread |
how should a program ask for no SI prefix? - StephenG1CMZ - 11-24-2015 03:14 PM
RE: how should a program ask for no SI prefix? - walter b - 11-24-2015, 03:37 PM
RE: how should a program ask for no SI prefix? - StephenG1CMZ - 11-24-2015, 11:50 PM
RE: how should a program ask for no SI prefix? - walter b - 11-25-2015, 06:46 AM
RE: how should a program ask for no SI prefix? - renif - 11-25-2015, 11:59 AM
RE: how should a program ask for no SI prefix? - Vtile - 11-26-2015, 11:43 PM
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