gnuplot

Gnuplot is a portable command-line driven graphing utility for linux, OS/2, MS Windows, OSX, VMS, and many other platforms. The source code is copyrighted but freely distributed (i.e., you don't have to pay for it). It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986. Gnuplot supports many types of plots in either 2D and 3D. It can draw using lines, points, boxes, contours, vector fields, surfaces, and various associated text. It also supports various specialized plot types. Demos here.

Gnuplot supports many different types of output: interactive screen terminals (with mouse and hotkey input), direct output to pen plotters or modern printers, and output to many file formats (eps, fig, jpeg, LaTeX, metafont, pbm, pdf, png, postscript, svg, ...). Gnuplot is easily extensible to include new output modes. Recent additions include interactive terminals based on aquaterm (OSX) and wxWidgets (multiple platforms).

What is new in this release:

• NEW set term {pngcairo|pdfcairo} pointscale <factor>
• NEW "save fit" back-ported from version 5.2 as a replacement for "update"
• CHANGE deprecate "update" command (but do not remove it)
• CHANGE allow placement of circles in 3D plots using axis coordinates
• CHANGE ignore invalid z coordinate for 3D objects placed in "set view map"
• CHANGE distinguish 'bind "shift-Button1"' from 'bind "Button1"'
• CHANGE use Mingw-w64 and MSVC popen rather than built-in "fake" popen
• FIX rangelimited y2 axis could produce spurious diagonal line across plot
• FIX assignment of x/y dimensions in "binary record=(a,b) ... with image"
• FIX negative array index caused by hidden3d degenerate polygon
• FIX object clipping in "set view map"
• FIX cairo terminals: scale textbox border linewidth by terminal linewidth
• FIX canvas terminal: initialization of plot dimensions (affects first zoom)
• FIX crash in stats if no usable data is found
• FIX do not use LaTeX formatting in tabular output
• FIX additional sanity checks for input data format
• FIX more consistent handling of plot 'with table'
• FIX incorrect, possibly empty, command string was saved for previous fit
• FIX 2D images with logscale axes could fail (segfault)
• FIX nested iteration containing an empty range