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[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Calculator N+ is an open source scientific calculator for your smartphone)
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[#]: via: (https://opensource.com/article/19/11/calculator-n-mobile)
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[#]: author: (Ricardo Berlasso https://opensource.com/users/rgb-es)
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Calculator N+ is an open source scientific calculator for your smartphone
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======
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The Android app does a wide range of advanced mathematical functions in
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the palm of your hand.
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![scientific calculator][1]
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Mobile phones are becoming more powerful every day, so it is no surprise that they can beat most computers from the not-so-distant past. This also means the tools available on them are getting more powerful every day.
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Previously, I wrote about [scientific calculators for the Linux desktop][2], and I'm following that up here with information about [Calculator N+][3], an awesome GPL v3.0-licensed computer algebra system (CAS) app for Android devices.
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Calculator N+ is presented as a "powerful calculator for Android," but that's a humble statement; the app not only works with arbitrary precision, displaying results with roots and fractions in all their glory, it does a _lot_ more.
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Finding polynomial roots? Check. Factorization? Check. Symbolic derivatives, integrals, and limits? Check. Number theory (modular arithmetic, combinatorics, prime factorization)? Check.
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You can also solve systems of equations, simplify expressions (including trigonometric ones), convert units… you name it!
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![Calculator N+ graphical interface][4]
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Results are output in LaTeX. The menu in the top-left provides many powerful functions ready to use with a simple touch. Also in that menu, you'll find Help files for all of the app's functions. At the top-right of the screen, you can toggle between exact and decimal representation. Finally, tapping the blue bar at the bottom of the screen gives you access to the whole library of functions available in the app. But be careful! If you are not a mathematician, physicist, or engineer, such a long list may seem overwhelming.
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All of this power comes from the [Symja library][5], another great GPL 3 project.
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Both projects are under active development, and they are getting better with each version. In particular, version 3.4.6 of Calculator N+ gets a major leap in user interface (UI) quality. And yes, there are still some rough corners here and there, but taming this much power in the tiny UI of a smartphone is a difficult task, and I think the app developers are solving its remaining issues quite well. Kudos to them!
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If you are a teacher, a student, or work on a STEM field, check out Calculator N+. It's free, no ads, open source, and covers all your math needs. (Except, of course, during math exams, where smartphones should never be allowed to prevent cheating.)
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Calculator N+ is available in the [Google Play Store][6], or you can [build it from source code][7] using the instructions on the GitHub page.
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If you know any other useful open source apps for science or engineering, let us know in the comments.
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The app makes use of the sensors on your phone and offers a digital science notebook to record your...
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/19/11/calculator-n-mobile
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作者：[Ricardo Berlasso][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/rgb-es
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/calculator_money_currency_financial_tool.jpg?itok=2QMa1y8c (scientific calculator)
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[2]: https://opensource.com/article/18/1/scientific-calculators-linux
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[3]: https://github.com/tranleduy2000/ncalc
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[4]: https://opensource.com/sites/default/files/uploads/calculatornplus_sqrt-frac.png (Calculator N+ graphical interface)
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[5]: https://github.com/axkr/symja_android_library
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[6]: https://play.google.com/store/apps/details?id=com.duy.calculator.free
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[7]: https://github.com/tranleduy2000/ncalc/blob/master/README.md
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@ -0,0 +1,58 @@
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[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Calculator N+ is an open source scientific calculator for your smartphone)
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[#]: via: (https://opensource.com/article/19/11/calculator-n-mobile)
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[#]: author: (Ricardo Berlasso https://opensource.com/users/rgb-es)
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Calculator N+ 是一款智能手机上的开源科学计算器
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======
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这个 Android 应用可在掌中计算许多高级数学函数。
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![scientific calculator][1]
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移动电话每天都在变得越来越强大，因此毫不奇怪它们可以击败大多数不太久前的大多数计算机。这也意味着上面的工具每天都在变得越来越强大。
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之前，我写过一篇 [Linux 桌面上的科学计算器][2]，我接着将介绍 [Calculator N +][3]，这是一个很棒的 GPL v3.0 许可证下的，适用于 Android 设备的计算机代数系统（CAS）应用。
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Calculator N+ 被认为是“适用于 Android 的强大计算器”，但这是一个谦虚的说法。它不仅可以以任意精度工作，还可以显示根数和分数等_很多_功能。
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寻找多项式根？可以。分解因数？可以。导数、积分和极限？可以。数论（模算术、组合学、素因数分解）？可以。
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你还可以求解系统方程、简化表达式（包括三角函数）、转换单位，只要你想到的，它都能做！
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![Calculator N+ graphical interface][4]
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结果以 LaTeX 输出。左上方的菜单提供了许多强大的功能，只需触摸一下即可使用。同样在该菜单中，你将找到该应用所有功能的帮助文件。在屏幕的右上角，你可以在精确和十进制表示之间切换。最后，点击屏幕底部的蓝色条，即可访问应用中的所有功能库。不过要小心！如果你不是数学家、物理学家或工程师，那么这么长的列表会看上去很震撼。
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所有这些功能都来自 [Symja 库][5]，这是另一个出色的 GPL 3 项目。
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这两个项目都处于积极开发中，并且每个版本都在不断完善。特别是，Calculator N+ 的 v3.4.6 在用户界面 （UI） 品质方面取得了重大飞跃。但是还是存在一些不好的地方，但是要在智能手机的小巧的用户界面中发挥如此强大的功能是一项艰巨的任务，我认为应用开发人员正在很好地解决其剩余的问题。对他们表示敬意！
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如果你是老师、学生或在理工科领域工作，请试试 Calculator N+。它是免费、无广告、开源的，并可以满足你所有的数学需求。（当然，除了数学考试期间，为防止作弊绝对不允许使用智能手机。）
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可以在 [Google Play 商店][6]找到 Calculator N+，也可以使用 GitHub 页面上的说明[从源代码构建][7]。
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如果你知道用于科学或工程的其他有用的开源应用，请在评论中告知我们。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/19/11/calculator-n-mobile
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作者：[Ricardo Berlasso][a]
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选题：[lujun9972][b]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/rgb-es
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/calculator_money_currency_financial_tool.jpg?itok=2QMa1y8c (scientific calculator)
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[2]: https://opensource.com/article/18/1/scientific-calculators-linux
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[3]: https://github.com/tranleduy2000/ncalc
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[4]: https://opensource.com/sites/default/files/uploads/calculatornplus_sqrt-frac.png (Calculator N+ graphical interface)
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[5]: https://github.com/axkr/symja_android_library
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[6]: https://play.google.com/store/apps/details?id=com.duy.calculator.free
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[7]: https://github.com/tranleduy2000/ncalc/blob/master/README.md
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