https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881009#M16259 <P><FONT color="#0000FF">我的目的：需要HP提供方案绕过n进一取整。</FONT></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="029357866ec2a68c30f0375f59c7e125_r.jpg" style="width: 480px;"><img src="https://h30471.www3.hp.com/t5/image/serverpage/image-id/29750iFC8BD39DDA805C59/image-size/large?v=v2&amp;px=999" role="button" title="029357866ec2a68c30f0375f59c7e125_r.jpg" alt="029357866ec2a68c30f0375f59c7e125_r.jpg" /></span></P><P>譬如，我用它计算pv=1，fv=2，i=8%，PMT=0时n的取值时，照理答案是lg2/lg1.08=9.006，就像说明书注释的0.006&gt;0.005，于是进一得10。虽然从整数年的角度考虑确实应该取整，但CFA、FRM指定的劲敌计算器BA II PLUS可以算到9.006，进不进一交给用户考虑。</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hp12cp.png" style="width: 456px;"><img src="https://h30471.www3.hp.com/t5/image/serverpage/image-id/29747i25AF0308841DAA7B/image-size/large?v=v2&amp;px=999" role="button" title="hp12cp.png" alt="hp12cp.png" /></span></P><P><A href="https://en.wikipedia.org/wiki/HP-12C#Bugs_and_problems" target="_blank">https://en.wikipedia.org/wiki/HP-12C#Bugs_and_problems</A><BR />By design, the HP-12C rounds up the number of payments to the next integer, which produces meaningless results when calculating fractional periods. Consequently, solving for n returns a value that is mathematically incorrect vis-a-vis the standard annuity formula and different from the value returned by other financial calculators, Excel, etc.</P><P>&nbsp;</P><P><A href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv005.cgi?read=8418" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv005.cgi?read=8418</A><BR />The HP12C always rounds the value of N up to the next whole integer.<BR /><FONT color="#FF0000">The HP12C owners manual (or application manual) has a program that can be keyed in to provide a more "accurate" answer, but the stock HP12C cannot do this.</FONT></P><P><FONT color="#000000">可能这段（成文于2001年）提到的程序存在于原版套件中，总之我的中文版用户手册里没找见。</FONT></P> Thu, 05 Jul 2018 14:47:02 GMT jix 2018-07-05T14:47:02Z https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881009#M16259 <P><FONT color="#0000FF">我的目的：需要HP提供方案绕过n进一取整。</FONT></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="029357866ec2a68c30f0375f59c7e125_r.jpg" style="width: 480px;"><img src="https://h30471.www3.hp.com/t5/image/serverpage/image-id/29750iFC8BD39DDA805C59/image-size/large?v=v2&amp;px=999" role="button" title="029357866ec2a68c30f0375f59c7e125_r.jpg" alt="029357866ec2a68c30f0375f59c7e125_r.jpg" /></span></P><P>譬如，我用它计算pv=1，fv=2，i=8%，PMT=0时n的取值时，照理答案是lg2/lg1.08=9.006，就像说明书注释的0.006&gt;0.005，于是进一得10。虽然从整数年的角度考虑确实应该取整，但CFA、FRM指定的劲敌计算器BA II PLUS可以算到9.006，进不进一交给用户考虑。</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="hp12cp.png" style="width: 456px;"><img src="https://h30471.www3.hp.com/t5/image/serverpage/image-id/29747i25AF0308841DAA7B/image-size/large?v=v2&amp;px=999" role="button" title="hp12cp.png" alt="hp12cp.png" /></span></P><P><A href="https://en.wikipedia.org/wiki/HP-12C#Bugs_and_problems" target="_blank">https://en.wikipedia.org/wiki/HP-12C#Bugs_and_problems</A><BR />By design, the HP-12C rounds up the number of payments to the next integer, which produces meaningless results when calculating fractional periods. Consequently, solving for n returns a value that is mathematically incorrect vis-a-vis the standard annuity formula and different from the value returned by other financial calculators, Excel, etc.</P><P>&nbsp;</P><P><A href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv005.cgi?read=8418" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv005.cgi?read=8418</A><BR />The HP12C always rounds the value of N up to the next whole integer.<BR /><FONT color="#FF0000">The HP12C owners manual (or application manual) has a program that can be keyed in to provide a more "accurate" answer, but the stock HP12C cannot do this.</FONT></P><P><FONT color="#000000">可能这段（成文于2001年）提到的程序存在于原版套件中，总之我的中文版用户手册里没找见。</FONT></P> Thu, 05 Jul 2018 14:47:02 GMT https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881009#M16259 jix 2018-07-05T14:47:02Z https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881031#M16260 <P>用户，您好～<BR /> <BR />这里是惠普电脑和打印机产品支持论坛，计算器产品不在我们的支持范围，请根据下面给出的电话进行咨询～<BR /> <BR />惠普计算器产品支持：<BR />座机拨打：800 820 9669<BR />手机拨打：021-26037128<BR />周一至周日8:30 - 18:00<BR />不要用手机打800电话，手机打800都是空号。<BR /> <BR />谢谢</P> Fri, 06 Jul 2018 01:23:33 GMT https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881031#M16260 KongL 2018-07-06T01:23:33Z https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881040#M16261 <P>那只是报修电话，无法提供技术服务。</P> Fri, 06 Jul 2018 02:08:00 GMT https://h30471.www3.hp.com/t5/ping-ban-dian-nao-ji-qi-ta-chan-pin/ru-he-rao-guoHP12CP-F2231AA-ji-suan-qi-jin-yi-qu-zheng/m-p/881040#M16261 jix 2018-07-06T02:08:00Z