From: Sjoerd Mullender <sjoerd@acm.org>

Date: Fri, 25 May 2007 14:21:17 +0200

Message-ID: <4656D4BD.1000201@acm.org>

To: Patrick Schmitz <cogit@ludicrum.org>

CC: "Dr. Olaf Hoffmann" <Dr.O.Hoffmann@gmx.de>, www-smil@w3.org

Date: Fri, 25 May 2007 14:21:17 +0200

Message-ID: <4656D4BD.1000201@acm.org>

To: Patrick Schmitz <cogit@ludicrum.org>

CC: "Dr. Olaf Hoffmann" <Dr.O.Hoffmann@gmx.de>, www-smil@w3.org

Patrick Schmitz wrote: > By even multiple we intended that it was an integer multiple, with no > fractional or partial multiple result. We should probably have said > "integer multiple". To be really precise we would have to specify an > (integer>0) multiple. > > Our intent with "some" positive integer is "any". This is an English > expression, common in mathematical descriptions. Sorry for any confusion. I propose to change the wording to "integral multiple" to make it clear that we're talking about proper multiples here. Alternatively, we could just leave out the word "even", but I think (as apparently the original author did also) that an extra adjective should make it even clearer. Sjoerd (member of the SYMM working group, so in a position to effect the change) > Patrick > >> -----Original Message----- >> From: www-smil-request@w3.org [mailto:www-smil-request@w3.org]On Behalf >> Of Dr. Olaf Hoffmann >> Sent: Friday, April 06, 2007 7:43 AM >> To: www-smil@w3.org >> Subject: Re: frozen value for discrete animation >> >> >> >> Hello, >> >> I think there is another problem concerning frozen animation, >> maybe just a wording problem. I discussed this with several >> people, but the result was always the same, but from my point of >> view somehow useless for animation, but maybe I am wrong with this. >> >> For 'Freezing animations' (SMIL 2.1, 3.3.5) it is noted: >> >> 'If AD is an even multiple of d, i.e. AD = d*i for some positive >> integer i , and the animation is non-cumulative, f_f(t) = f(d).' >> >> There a two remarkable points about this - why only 'some' and not >> 'any' or 'a' positive integer and why only even multiples, why not >> odd multiples too? >> Ok, if odd multiples are excluded by this rule, this means that >> some integers are only even integers, but then it should be much >> more precise to write: >> 'AD = d*2*i for a positive integer i' >> >> Of course 'even' can have several meanings, therefore >> I looked for another interpretation for 'even multiple' >> in wikipedia and other resources, but all I could find is >> really: >> 'AD = d*2*i for a positive integer i'. >> I cannot see, why to distinguish between odd and even >> multiples? Is there any reason? >> >> This causes another problem for odd multiples, because then >> the following has to be applied: >> >> 'If AD is not an even multiple of the simple duration d, >> f_f(t) = f_i(t), where i = floor(t/d).' >> >> For example with AD=d (odd multiple) we get 1 = floor(d/d) >> f_f(t=AD) = f_1(t=0) >> if the animation is repeated (and stopped for example with >> an end attribute) and an undefined value, if the animation >> is not repeated. Is this correct? >> >> >> Thanks in advance for a clarification >> >> Olaf Hoffmann >> > > -- Sjoerd MullenderReceived on Friday, 25 May 2007 12:21:54 UTC

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