Subject: Re: [xsl] Function that reduces the number of digits to the rightof the decimal point? From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 23 Jun 2020 16:31:14 -0000 |
Sorry, should be (4.99 * 10 idiv 1) div 10 Michael Kay floor($x) does the same as $x idiv 1 for positive numbers, it's different for negative. > On 23 Jun 2020, at 17:25, Roger L Costello costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Michael Kay wrote: > > (4.99 * 10 idiv 10) gives 4.9 > > But, but, but, . > > 4.99 * 10 = 49.9 > 49.9 idiv 10 = 4 > > Right? > > /Roger > > From: Michael Kay mike@xxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> > Sent: Tuesday, June 23, 2020 11:48 AM > To: xsl-list <xsl-list@xxxxxxxxxxxxxxxxxxxxxx> > Subject: [EXT] Re: [xsl] Function that reduces the number of digits to the rightof the decimal point? > > Do you absolutely want truncation (so 4.99 becomes 4.9) or will rounding do (so 4.99 becomes 5.0)? > > If rounding will do, then use round($x, -$desired-digits). > > If you really want truncation then consider the "idiv" operator, for example (4.99 * 10 idiv 10) gives 4.9: you can construct the value 10 as math:pow(10, $desired-digits). > > Michael Kay > Saxonica > > > On 23 Jun 2020, at 15:28, Roger L Costello mailto:costello@xxxxxxxxx <mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hi Folks, > > $num is a variable holding a decimal value. > > $desired-number-of-digits-after-decimal-point is a variable holding an integer value. > > I want a function that reduces the number of digits to the right of the decimal point in $num according to the value specified in $desired-number-of-digits-after-decimal-point > > Example #1: > $num = 42.366978 > $desired-number-of-digits-after-decimal-point = 2 > The result of applying the function is: 42.36 > > Example #2: > $num = 42.366978 > $desired-number-of-digits-after-decimal-point = 0 > The result of applying the function is: 42 > > Below is one way to implement the function. Is there a better way? By "better" I mean simpler, more correct. > > Also, is there a better name for the function? By "better" I mean shorter, more standardized. /Roger > ----------------------------------------------------- > <xsl:function name="f:reduce-number-of-digits-after-decimal-point" as="xs:string"> > <xsl:param name="num" as="xs:string" /> > <xsl:param name="desired-number-of-digits-after-decimal-point" as="xs:integer" /> > > <xsl:variable name="whole-part" select="substring-before($num, '.')"/> > <xsl:variable name="fraction-part" select="substring-after($num, '.')"/> > <xsl:variable name="reduced-fraction-part" select="substring($fraction-part, 1, $desired-number-of-digits-after-decimal-point)"/> > <xsl:choose> > <xsl:when test="$desired-number-of-digits-after-decimal-point gt 0"> > <xsl:value-of select="concat($whole-part, '.', $reduced-fraction-part)"/> > </xsl:when> > <xsl:otherwise> > <xsl:value-of select="$whole-part"/> > </xsl:otherwise> > </xsl:choose> > </xsl:function> > > http://www.mulberrytech.com/xsl/xsl-list > http://lists.mulberrytech.com/unsub/xsl-list/673357 ()
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