这是我在PALM pre上见过{zh0}用科学计算计算器!功能强大!
* u2 q1 i! Z3 u; m作者还公布源代码了.在APcatlog上卖9.9$,但是下载源代码后可以自己动手安装,也可以打包成ipk的安装包.
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Scientific RPN Calculator
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3 d; z: E+ K5 E Downloads This Week: 0 / ~7 A7 R! _  d7 {8 _9 T! ?, M# sTotal downloads: 9,910 8 @2 ^6 D* `% S' F& VDistribution: ! q3 z1 q' c( A4 O* ?Not Available via Repository, Available via App Catalog

Category 8 X3 `' u1 }, C, l. i9 I  m3 |Productivity3 |: K+ O: x- M1 B0 C, y. S8 a4 n Tags:4 d' H6 q8 f- k6 f  a! J calculator0 @9 M9 b/ \, r4 Z Last Updated: # X& e1 O# }1 C/ uMonday, Aug 17, 2009* W8 ?" I+ u; J Current Version:+ e" ^; Z/ t" i, ^' t3 P3 q 1.0.45( A" U# T2 _0 y1 ^! g. y. ]1 v* K Root Required:- q1 y$ u( @+ A6 M4 i( R; O6 \ No 0 N; n/ ~5 u. h  t' `Developer: * C0 I3 `3 h+ P. Z6 ]$ kTheMarco3 E1 H  J, A8 @& k: U, y+ ~* j/ {# W Developer Homepage:/ ~; U3 h2 _% z$ ~$ j : o( q  x% \! b" d/ eRating: 4.175 C1 c6 R: D" B; k! B. m, u7 b  l " n5 e4 K8 m. T5 q% b' W- I% o # |" V; m. J# z; u$ k4 P, {6 x  G1 Z# R: g , r5 n( E. L) d9 b1 D, t, Z4 |; l, ` & V. C9 R1 H2 b( q$ P . u! f& O" g" `, I 2 V" Z/ F+ C2 N; m; k1 s * q3 {  V% v4 M$ j1 Q$ }% e' d ! i' l+ T' z4 h' o5 qAverage: 4.2 (100 votes) - }- ^7 o; T: V0 S# v% q- D" ~8 j3 s" z3 ^# ? . s; n9 G. X7 y/ E) J/ Q4 u1 f% K- n5 \

DescriptionAs per B36: please UNINSTALL the existing app before installing B36 or higher. I had to change the app ID which means if you upgrade it won't overwrite but you'll end up with TWO calculators.
) Y- F1 J: y8 }( C8 }4 BThis is a scientific RPN calculator, inspired by (but not exactly emulating) the famous HP 1xC range of calculators. It features a 4-level stack and tons of calculator features.
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This application INCLUDES a full blown unit converter supporting 20 different properties and an enormous amount of different units to convert from and to within these properties." ~! s/ g' L1 D  I
There is keyboard support for number entry and basic operations.+ H- j# S; }4 n, J3 G# }
This application has a fully customized GUI and a lot of work has been put into making it look as pretty as possible. If you're not familiar with RPN calculators, here's some simple examples:+ r6 H! }+ p7 ?) D) ]( R) j7 @* f) H
This application has a fully customized GUI and a lot of work has been put into making it look as pretty as possible. If you're not familiar with RPN calculators, here's some simple examples:
  i1 ]- y2 ]% [3 n  G  sLet's say you want to add 5+3:
. p4 y8 T' D8 b" {  |. K" D4 fOn a normal calculator you'd type '5 + 3 = '." F. D9 r8 j5 ~5 C# n7 u
On an RPN calculator you type '5 ENTER 3 +'.
1 x2 a" r% L+ m# G+ ?6 w% _It's kind of like using paper to do calculations if you think of it.
- t/ ?3 G. Y: r% B& l- q6 |% `9 C: eRPN really shines when it comes to more complex calculations where operator precedence comes into play and brackets would need to be used. This is because an RPN calculator has a 4 level 'stack'.
7 W! E8 |1 x  ]2 S* _! yLet's say you want to do the following:5 O5 q4 }# j( z! m' @- h' e! {
((5 * 3) / 2) + 7. j5 F% P" L- e2 H! Z
On a normal calculator you'd need to use brackets.  C- ^7 U0 s; n! P; b9 D
On this calculator you simply type:
( _7 C' z  e, |'5 ENTER 3 *', then '2 /' and finally '7 +'. Pretty cool huh?5 Z6 R0 Q+ Y5 ^" \6 B. z
This application is still under development which means there will be bugs. Feedback is more than welcome!
, J: _7 ]- Y- k: M/ M/ b8 U  @This application is now only available as source on GitHub and will be in the app store soon for $9.99. You're free to get the source from GitHub and build it yourself but you're NOT allowed to (re)distribute IPK packages of this application.
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More Screenshots
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7 z! `" o  b) I! S6 n7 VLicenseOther (Described above)
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AvailabilityIn beta now. Will be open source (have to build app yourself from source) and available for a fee in the app store. Read the license!' ~& Q  n! e7 ?6 b) h5 w2 V( _4 ^
Download OptionsPlease or to download this file! Discussion, Changelog, and SupportDiscuss this app, get support, and read the changelog for Scientific RPN Calculator in the   ]) S0 m% Q" x* T
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0 ?% j+ @, ^5 o/ r/ Q- x" u! D[ Edited by nickjun on 2010-1-24 17:38 ]