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[Translated]20180531 Qalculate- - The Best Calculator Application in The Entire Universe
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Qalculate! – The Best Calculator Application in The Entire Universe
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======
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I have been a GNU-Linux user and a [Debian][1] user for more than a decade. As I started using the desktop more and more, it seemed to me that apart from few web-based services most of my needs were being met with [desktop applications][2] within Debian itself.
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One of such applications was the need for me to calculate between different measurements of units. While there are and were many web-services which can do the same, I wanted something which could do all this and more on my desktop for both privacy reasons as well as not having to hunt for a web service for doing one thing or the other. My search ended when I found Qalculate!.
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### Qalculate! The most versatile calculator application
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![Qalculator is the best calculator app][3]
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This is what aptitude says about [Qalculate!][4] and I cannot put it in better terms:
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> Powerful and easy to use desktop calculator – GTK+ version
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>
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> Qalculate! is small and simple to use but with much power and versatility underneath. Features include customizable functions, units, arbitrary precision, plotting, and a graphical interface that uses a one-line fault-tolerant expression entry (although it supports optional traditional buttons).
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It also did have a KDE interface as well as in its previous avatar, but at least in Debian testing, it just shows only the GTK+ version which can be seen from the github [repo][5] as well.
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Needless to say that Qalculate! is available in Debian repository and hence can easily be installed [using apt command][6] or through software center in Debian based distributions like Ubuntu. It is also availale for Windows and macOS.
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#### Features of Qalculate!
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Now while it would be particularly long to go through the whole list of functionality it allows – allow me to list some of the functionality to be followed by a few screenshots of just a couple of functionalities that Qalculate! provides. The idea is basically to familiarize you with a couple of basic methods and then leave it up to you to enjoy exploring what all Qalculate! can do.
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* Algebra
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* Calculus
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* Combinatorics
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* Complex_Numbers
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* Data_Sets
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* Date_&_Time
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* Economics
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* Exponents_&_Logarithms
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* Geometry
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* Logical
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* Matrices_&_Vectors
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* Miscellaneous
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* Number_Theory
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* Statistics
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* Trigonometry
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#### Using Qalculate!
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Using Qalculate! is not complicated. You can even write in the simple natural language. However, I recommend [reading the manual][7] to utilize the full potential of Qalculate!
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![qalculate byte to gibibyte conversion ][8]
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![conversion from celcius degrees to fahreneit][9]
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#### qalc is the command line version of Qalculate!
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You can achieve the same results as Qalculate! with its command-line brethren qalc
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```
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$ qalc 62499836 byte to gibibyte
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62499836 * byte = approx. 0.058207508 gibibyte
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$ qalc 40 degree celsius to fahrenheit
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(40 * degree) * celsius = 104 deg*oF
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```
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I shared the command-line interface so that people who don’t like GUI interfaces and prefer command-line (CLI) or have headless nodes (no GUI) could also use qalculate, pretty common in server environments.
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If you want to use it in scripts, I guess libqalculate would be the way to go and seeing how qalculate-gtk, qalc depend on it seems it should be good enough.
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Just to share, you could also explore how to use plotting of series data but that and other uses will leave to you. Don’t forget to check the /usr/share/doc/qalculate/index.html to see all the different functionalities that Qalculate! has.
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Note:- Do note that though Debian prefers [gnuplot][10] to showcase the pretty graphs that can come out of it.
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#### Bonus Tip: You can thank the developer via command line in Debian
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If you use Debian and like any package, you can quickly thank the Debian Developer or maintainer maintaining the said package using:
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```
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reportbug --kudos $PACKAGENAME
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```
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Since I liked QaIculate!, I would like to give a big shout-out to the Debian developer and maintainer Vincent Legout for the fantastic work he has done.
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```
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reportbug --kudos qalculate
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```
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I would also suggest reading my detailed article on using reportbug tool for [bug reporting in Debian][11].
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#### The opinion of a Polymer Chemist on Qalculate!
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Through my fellow author [Philip Prado][12], we contacted a Mr. Timothy Meyers, currently a student working in a polymer lab as a Polymer Chemist.
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His professional opinion on Qaclulate! is –
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> This looks like almost any scientist to use as any type of data calculations statistics could use this program issue would be do you know the commands and such to make it function
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>
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> I feel like there’s some Physics constants that are missing but off the top of my head I can’t think of what they are but I feel like there’s not very many [fluid dynamics][13] stuff in there and also some different like [light absorption][14] coefficients for different compounds but that’s just a chemist in me I don’t know if those are super necessary. [Free energy][15] might be one
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In the end, I just want to share this is a mere introduction to what Qalculate! can do and is limited by what you want to get done and your imagination. I hope you like Qalculate!
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/qalculate/
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作者：[Shirish][a]
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选题：[lujun9972](https://github.com/lujun9972)
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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://itsfoss.com/author/shirish/
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[1]:https://www.debian.org/
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[2]:https://itsfoss.com/essential-linux-applications/
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[3]:https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/05/qalculate-app-featured-1-800x450.jpeg
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[4]:https://qalculate.github.io/
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[5]:https://github.com/Qalculate
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[6]:https://itsfoss.com/apt-command-guide/
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[7]:https://qalculate.github.io/manual/index.html
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[8]:https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/04/qalculate-byte-conversion.png
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[9]:https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/04/qalculate-gtk-weather-conversion.png
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[10]:http://www.gnuplot.info/
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[11]:https://itsfoss.com/bug-report-debian/
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[12]:https://itsfoss.com/author/phillip/
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[13]:https://en.wikipedia.org/wiki/Fluid_dynamics
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[14]:https://en.wikipedia.org/wiki/Absorption_(electromagnetic_radiation)
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[15]:https://en.wikipedia.org/wiki/Gibbs_free_energy
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Qalculate! – 全宇宙最好的计算器软件
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======
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十多年来，我一直都是 GNU-Linux 以及 [Debian][1] 的用户。随着我越来越频繁的使用桌面环境，我发现对我来说除了少数基于 web 的服务以外我的大多数需求都可以通过 Debian 软件库里自带的[桌面应用][2]解决。
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我的需求之一就是进行单位换算。尽管有很多很多在线服务可以做这件事，但是我还是需要一个可以在桌面环境使用的应用。这主要是因为隐私问题以及我不想一而再再而三的寻找在线服务做事。为此我搜寻良久，直到找到 Qalculate!。
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### Qalculate! 最强多功能计算器应用
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![最佳计算器应用 Qalculator][3]
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这是 aptitude 上关于 [Qalculate!][4] 的介绍，我没法总结的比他们更好了：
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> 强大易用的桌面计算器 - GTK+ 版
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>
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> Qalculate! 是一款外表简单易用，内核强大且功能丰富的应用。其功能包含自定广义函数，单位，计算精度，作图以及可以输入一行表达式（有容错措施）的图形界面（也可以选择使用传统按钮）。
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这款应用也发行过 KDE 的界面，但是至少在 Debian Testing 软件库里，只出现了 GTK+ 版的界面，你也可以在 GitHub 上的这个[仓库][5]里面看到。
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不必多说， Qalculate! 在 Debian 的软件源内处于可用状态，因此可以使用 [apt][6] 命令或者是基于 Debian 的发行版比如 Ubuntu 提供的软件中心轻松安装。在 Windows 或者 macOS 上也可以使用这款软件。
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### Qalculate! 特性一览
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列出全部的功能清单会有点长，请允许我只列出一部分功能并使用截图来展示极少数 Qalculate! 提供的功能。这么做是为了让你熟悉 Qalculate! 的基本功能并在之后可以自由探索 Qalculate! 到底还能干什么。
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* 代数
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* 微积分
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* 组合数学
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* 复数
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* 数据集
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* 日期与时间
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* 经济学
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* 对数和指数
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* 集合
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* 逻辑学
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* 向量和矩阵
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* 杂项
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* 数论
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* 统计学
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* 三角学
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#### 使用 Qalculate!
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Qalculate! 的使用不是很难。你甚至可以在里面写简单的英文。但是我还是推荐先[阅读手册][7]以便充分发挥 Qalculate! 的潜能。
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![使用 Qalculate 进行字节到 GB 的换算][8]
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![摄氏度到华氏度的换算][9]
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#### qalc 是 Qalculate! 的命令行版
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你也可以使用 Qalculate! 的命令行版 `qalc`：
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```
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$ qalc 62499836 byte to gibibyte
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62499836 * byte = approx. 0.058207508 gibibyte
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$ qalc 40 degree celsius to fahrenheit
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(40 * degree) * celsius = 104 deg*oF
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```
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Qalculate! 的命令行界面可以让不喜欢 GUI 而是喜欢命令行界面（CLI）或者是使用无头结点（没有 GUI）的人可以使用 Qalculate!。这些人大多是在服务器环境下工作。
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如果你想要在脚本里使用这一软件的话，我想 libqalculate 是最好的解决方案。看一看 qalc 以及 qalculate-gtk 是如何依赖于它工作的就足以知晓如何使用了。
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再提一嘴，你还可以了解下如何根据一系列数据绘图，其他应用方式就留给你自己发掘了。不要忘记查看 /usr/share/doc/qalculate/index.html 以获取 Qalculate! 的全部功能。
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注释:- 注意 Debian 更喜欢 [gnuplot][10]，因为其输出的图片很精美。
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#### 额外贴士： 你可以通过在 Debian 下通过命令行感谢开发者
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如果你使用 Debian 而且喜欢哪个包的话，你可以使用如下命令感谢 Debian 下这个软件包的开发者或者是维护者：
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```
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reportbug --kudos $PACKAGENAME
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```
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因为我喜欢 Qalculate!，我想要对 Debian 的开发者以及维护者 Vincent Legout 的卓越工作表示感谢：
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```
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reportbug --kudos qalculate
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```
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建议各位阅读我写的关于如何使用报错工具的详细指南 [在 Debian 中上报 BUG][11].
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#### 一位高分子化学家对 Qalculate! 的评价
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经由作者 [Philip Prado][12]，我们联系上了 Timothy Meyers 先生，他目前是在高分子实验室工作的高分子化学家。
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他对 Qaclulate! 的专业评价是 -
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> 看起来这个软件几乎任何科学家都可以使用，因为如果你直到指令以及如何使其生效的话，几乎任何数据计算都可以使用这个软件计算。
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> 我觉得这个软件少了些物理常数，但我想不起来缺了哪些。我觉得那里没有很多有关[流体动力学][13]的东西，再就是少了点部分化合物的[光吸收][14]系数，但这些东西只对我这个化学家来说比较重要，我不知道这些是不是对别人来说也是特别必要的。 自由能也许会这样。
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最后，我分享的关于 Qalculate! 的介绍十分简陋，其实际功能与你的需要以及你的想象力有关系。希望你能喜欢 Qalculate!
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/qalculate/
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作者：[Shirish][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[name1e5s](https://github.com/name1e5s)
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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://itsfoss.com/author/shirish/
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[1]:https://www.debian.org/
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[2]:https://itsfoss.com/essential-linux-applications/
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[3]:https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/05/qalculate-app-featured-1-800x450.jpeg
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[4]:https://qalculate.github.io/
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[5]:https://github.com/Qalculate
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[6]:https://itsfoss.com/apt-command-guide/
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[7]:https://qalculate.github.io/manual/index.html
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[8]:https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/04/qalculate-byte-conversion.png
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[9]:https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/04/qalculate-gtk-weather-conversion.png
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[10]:http://www.gnuplot.info/
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[11]:https://itsfoss.com/bug-report-debian/
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[12]:https://itsfoss.com/author/phillip/
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[13]:https://en.wikipedia.org/wiki/Fluid_dynamics
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[14]:https://en.wikipedia.org/wiki/Absorption_(electromagnetic_radiation)
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[15]:https://en.wikipedia.org/wiki/Gibbs_free_energy
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