Re: [cellml-discussion] Proposal: Standardised CellML real number format
Alan Garny wrote: >>> Therefore, I think that we need to restrict it down to something like >>> (in regular expression syntax): >>> >>> (\-|)[0-9]+(\.[0-9]+|)(E(-|)[0-9]+|e(-|)[0-9]+|) >>> >>> In other words: >>> An optional - , followed by 1 or more digits from 0 to 9, followed by >>> an optional decimal point (not a comma or momayyez) followed by an >>> optional E or e character with a possible sign and one or more digits >>> after it. >>> >> probably best to allow for an optional '+' or '-' both at the start and >> following the exponent character. >> > > So something like (assuming my use of the syntax is correct): > > (\+|\-|)[0-9]+(\.[0-9]+|)((E|e)(\+|\-|)[0-9]+) > > Note that I have also 'simplified' the exponent part. > I don't think the exponent should be mandatory, however, as this would break the majority of models in use. Best regards, Andrew ___ cellml-discussion mailing list cellml-discussion@cellml.org http://www.cellml.org/mailman/listinfo/cellml-discussion
Re: [cellml-discussion] Proposal: Standardised CellML real number format
> > Therefore, I think that we need to restrict it down to something like > > (in regular expression syntax): > > > > (\-|)[0-9]+(\.[0-9]+|)(E(-|)[0-9]+|e(-|)[0-9]+|) > > > > In other words: > > An optional - , followed by 1 or more digits from 0 to 9, followed by > > an optional decimal point (not a comma or momayyez) followed by an > > optional E or e character with a possible sign and one or more digits > > after it. > > probably best to allow for an optional '+' or '-' both at the start and > following the exponent character. So something like (assuming my use of the syntax is correct): (\+|\-|)[0-9]+(\.[0-9]+|)((E|e)(\+|\-|)[0-9]+) Note that I have also 'simplified' the exponent part. Alan. ___ cellml-discussion mailing list cellml-discussion@cellml.org http://www.cellml.org/mailman/listinfo/cellml-discussion
Re: [cellml-discussion] Proposal: Standardised CellML real number format
David Nickerson wrote: >> Therefore, I think that we need to restrict it down to something like >> (in regular expression syntax): >> >> (\-|)[0-9]+(\.[0-9]+|)(E(-|)[0-9]+|e(-|)[0-9]+|) >> >> In other words: >> An optional - , followed by 1 or more digits from 0 to 9, followed by >> an optional decimal point (not a comma or momayyez) followed by an >> optional E or e character with a possible sign and one or more digits >> after it. >> > > probably best to allow for an optional '+' or '-' both at the start and > following the exponent character. > > I have no experience, but does using a non-EN locale make it difficult > to enter numbers with a decimal point? > Based on http://en.wikipedia.org/w/index.php?title=Keyboard_layout&oldid=158242943 it looks like we are okay for the European, South American, and Asian keyboard layouts. I am not sure about the Arabic and Armenian layouts. However, I think that programs can present the numbers to the user in whatever format they like, as long as the specification describes that they are stored in a consistent way. Users who can't enter the full stop / period character who want to edit a CellML file in a text editor will have other problems anyway, e.g. they couldn't type in the CellML namespace or the XML version (or any cn elements in the MathML). Best regards, Andrew > ___ > cellml-discussion mailing list > cellml-discussion@cellml.org > http://www.cellml.org/mailman/listinfo/cellml-discussion > ___ cellml-discussion mailing list cellml-discussion@cellml.org http://www.cellml.org/mailman/listinfo/cellml-discussion
Re: [cellml-discussion] Proposal: Standardised CellML real number format
> Therefore, I think that we need to restrict it down to something like > (in regular expression syntax): > > (\-|)[0-9]+(\.[0-9]+|)(E(-|)[0-9]+|e(-|)[0-9]+|) > > In other words: > An optional - , followed by 1 or more digits from 0 to 9, followed by > an optional decimal point (not a comma or momayyez) followed by an > optional E or e character with a possible sign and one or more digits > after it. probably best to allow for an optional '+' or '-' both at the start and following the exponent character. I have no experience, but does using a non-EN locale make it difficult to enter numbers with a decimal point? ___ cellml-discussion mailing list cellml-discussion@cellml.org http://www.cellml.org/mailman/listinfo/cellml-discussion
[cellml-discussion] Proposal: Standardised CellML real number format
Hi all,
The CellML Specification does not define the format in which real
numbers will be represented at all (it just says, for initial_value:
"The value of the |initial_value| attribute may be a real number or a
variable"). The MathML specification defines
"A real number is presented in decimal notation. Decimal notation
consists of an optional sign ("+" or "-") followed by a string of digits
possibly separated into an integer and a fractional part by a "decimal
point". Some examples are 0.3, 1, and -31.56. If a different |base| is
specified, then the digits are interpreted as being digits computed to
that base."
This means that there are no constraints at all on how initial values
can be represented. It is common practice in current CellML processing
to use representations in standard notation, using formats like 1E8.
Therefore, I think that we need to restrict it down to something like
(in regular expression syntax):
(\-|)[0-9]+(\.[0-9]+|)(E(-|)[0-9]+|e(-|)[0-9]+|)
In other words:
An optional - , followed by 1 or more digits from 0 to 9, followed by
an optional decimal point (not a comma or momayyez) followed by an
optional E or e character with a possible sign and one or more digits
after it.
Are there any opinions about this? I will re-raise this at the next
CellML meeting next Wednesday so we can summarise any discussion which
has occurred on the mailing lists, so please send your comments before then.
Best regards,
Andrew
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