gnuplot worked very well for me when I was working on some performance analysis. Easy to create datasets and it will plot multiple items against the same "time" base (as I was using it)
我经常将数据导出为 csv 格式的绘图，然后使用 ms excel 或 gnumeric 或其他电子表格程序来读取数据并快速绘制绘图。对于小型（< 65535）数据集非常方便。 :-)
I often export data to plot as csv, and then use ms excel or gnumeric, or other spreadsheet programs to read that and make a quick plot. quite handy for small (< 65535) set of data. :-)
Depends on the type of "plotting" you want to do - I use Matlab and find its plotting excellent for image analysis, particularly using imshow and surf. As you requested a free tool you could use Octave (an open source clone of Matlab) and its image processing library to do similar.
MathGL (and its front-end UDAV) is free (GPL, and partially LGPL) plotting library. It have more than 55 general types of graphics for 1d, 2d and 3d data arrays. It can export graphics to raster and vector (EPS or SVG) formats. It has Qt, FLTK, OpenGL interfaces and can be used even from console programs. It has functions for data handling and script MGL language for simplification of data plotting. Also it has several types of transparency and smoothed lightning, vector fonts and TeX-like symbol parsing, arbitrary curvilinear coordinate system and many over useful things. It can be used from code written on C++/C/Fortran/Python/Octave and many other languages. Finally it is platform independent and free (under GPL v.2.0 or later license).
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当我进行一些性能分析时， gnuplot 对我来说非常有效。易于创建数据集，它将根据相同的“时间”基础绘制多个项目（正如我使用的那样）
gnuplot worked very well for me when I was working on some performance analysis. Easy to create datasets and it will plot multiple items against the same "time" base (as I was using it)
我最喜欢的是基于 Clojure 的Incanter。
最受认可的可能是 R
两者都非常好而且免费。
The one I like the most is Incanter based on Clojure.
The most recognized would maybe be R
Both are very good and free.
gnuplot 对我来说效果很好。它可以在 sourceforge 上免费下载，这里是 gnuplot 相关内容的链接
http://www.gnuplot.info/
gnuplot works well for me. it is freely downloadable at sourceforge and here is the link for gnuplot related stuff
http://www.gnuplot.info/
我经常将数据导出为 csv 格式的绘图，然后使用 ms excel 或 gnumeric 或其他电子表格程序来读取数据并快速绘制绘图。对于小型（< 65535）数据集非常方便。 :-)
I often export data to plot as csv, and then use ms excel or gnumeric, or other spreadsheet programs to read that and make a quick plot. quite handy for small (< 65535) set of data. :-)
取决于你想要做的“绘图”类型 - 我使用 Matlab 并发现它的绘图非常适合图像分析，特别是使用 imshow 和 surf。当您请求免费工具时，您可以使用 Octave（Matlab 的开源克隆）及其图像处理库来执行类似操作。
Depends on the type of "plotting" you want to do - I use Matlab and find its plotting excellent for image analysis, particularly using imshow and surf. As you requested a free tool you could use Octave (an open source clone of Matlab) and its image processing library to do similar.
MathGL（及其前端 UDAV）是免费的（GPL 和部分 LGPL）绘图库。它有超过 55 种用于 1d、2d 和 3d 数据数组的通用图形类型。它可以将图形导出为光栅和矢量（EPS 或 SVG）格式。它具有 Qt、FLTK、OpenGL 接口，甚至可以在控制台程序中使用。它具有数据处理功能和脚本MGL语言，可简化数据绘图。它还具有多种类型的透明度和平滑闪电、矢量字体和类似 TeX 的符号解析、任意曲线坐标系以及许多有用的东西。它可以在 C++/C/Fortran/Python/Octave 和许多其他语言编写的代码中使用。最后，它是平台独立且免费的（根据 GPL v.2.0 或更高版本的许可证）。
MathGL (and its front-end UDAV) is free (GPL, and partially LGPL) plotting library. It have more than 55 general types of graphics for 1d, 2d and 3d data arrays. It can export graphics to raster and vector (EPS or SVG) formats. It has Qt, FLTK, OpenGL interfaces and can be used even from console programs. It has functions for data handling and script MGL language for simplification of data plotting. Also it has several types of transparency and smoothed lightning, vector fonts and TeX-like symbol parsing, arbitrary curvilinear coordinate system and many over useful things. It can be used from code written on C++/C/Fortran/Python/Octave and many other languages. Finally it is platform independent and free (under GPL v.2.0 or later license).