Introduction to Gnuplot

General Information

not so FAQ

• Legend
• Tics
• Label
• 2-D Plot
• 3-D Plot
• Polar Coordinate
• Parametric Functions
• Data File
• After Plotting
• Miscellaneous Stuff

Special Functions

• Spherical Harmonics
• Fractal
• Implict Function

Gallery

Set Commands

Use for Technical Paper Submission

Use for WWW Access Log

Comparison of Terminals

(J) About This Site

Introduction to gnuplot

• Basic Use - from start to the end
• Use for a Numerical Calculation - Plots of Calculated Results
• Use for Experimental Data - Plots of Experimental Data
• Plot Functions and the Least-Squares fitting to experimental data
• Life with gnuplot
• Plotting styles

General Information

• Where can I download the current version of gnuplot ?
• Where can I get FAQ of gnuplot ?
• What can I do if I find some mistakes in this document ?
• Do I have an archive of this web-site ?
• Related Topics / Link
• Notes on the gnuplot version
• (J) About this site

About Legend

• How do I erase a legend ?
• How do I change the location of legend ?
• How do I get rid of error bars in a legend ?
• Location of the text is sometimes strange when Postscript symbols are used in it.
• Adjust the line-skip
• Make a frame-box

About Tics

• How do I change an appearance of tics on each axis ?
• I want to use an exponent instead of a decimal like 0.001 in a log-scale plot.
• How do I change the format of the numbers ?
• How do I erase numbers ?
• I want to make intermediate values in the logarithmic tics.

About Label

• I want to use super/subscripts in a text.
• I want to use Greek letters in a text.
• How do I adjust an interval between X,Y axes and their labels ?
• How do I specify positions and coordinates of labels ?
• I want to draw arrows in my figure.
• Can I use a colored label ? [ver.4]
• How can I change the direction of Y-axis name ?

About 2-Dimensional Plot

• I want to make a fixed-size plot.
• I want to use both sides of Y-axes.
• I want to erase axes.
• I want to draw a square or fixed aspect ratio figure.
• I want to draw a zero axis.
• I want to get rid of small bars which appear at the top of error bars.
• I want to make letters larger.
• I want to connect all points with some smooth curves.
• I want to erase points those are on border.
• I want to draw several figures on one drawing.
• I want to draw a grid at minor tics.
• I want to draw two axes in the different scale
• I want to make grid at an arbitrary position.
• A small figure in a figure
• A simple bar-chart
• Align two figures those show the same data in a different way.
  • Place two figures in a different scale.
  • Compare two similar data with each other by absolute values and ratio.
• Display a graph with normal probability axis.
• How can I print values at each datapoint ?

About 3-dimensional Plot

• Why the origin of Z-axis is not on the XY-plane ?
• I want to make a surface mesh finer.
• How do I change a view point ?
• How do I change contours ?
• I want to draw only contours on the 2-dimensional plot.
• How do I draw a 3-dim. grid graph from 3-Dim scattered data ?
• How do I draw a colored 3D figure ? [ver.4]
• I want to draw colors for contours. [ver.4]
• Pseudo 3D Bar graph
• How can I change the colors in a 3D figure ?

About Polar Coordinate

• to plot data in the 2-dimensional polar coordinate.
• to draw lines from data-points to the origin.
• to draw grids.

About Parametric Functions

• use of parameters
• to draw a vertical line
• to draw a circle, polygons
• exchange X and Y-axes

Plotting Numerical Data in a Data File

• What is the format which gnuplot can recognize ?
  • 2-dimensional data
  • 3-dimensional data
  • matrix
• How do I plot several data sets in a single file ?
• I want to modify values in my data file when plotting.
• I want to put some plotting commands in a data file.
• I want to eliminate some data points.
• How do I plot a part of data in a file ?
• How do I use UNIX commands inside gnuplot ?
  • sort
  • paste
  • sed
  • awk

Date/Time Data

• plotting time-sequence data
• to change output text

After Plotting

• I want to put a figure in my TeX document.
• I want to merge several figures into one figure.
• How do I convert a figure into image formats like PNG ?
• How do I change colors in a PostScript figure ?
• I want to get rid of a right-side margin in a square figure.

Miscellaneous Stuff

• Ternary operator (A ? B : C)
• Broken functions
• Loop
• Least-Squares Fitting with non-linear functions (I)
• Least-Squares Fitting with non-linear functions (II)
• What is the dumb terminal ?
• How do I make a figure with many kinds of lines ?
• Write least-squares parameter values in the figure [NEW]

Special Functions

• Spherical Harmonics
  • Parametric
  • Spherical harmonics
  • Various angular momenta and magnetic quantum numbers
  • Deformed Nucleus (Legendre Expansion) [ver.4]
• Fractal
  • Recursive definition
  • Mandelbrot set
  • Self-Squared fractal
• Implicit Function
  • To solve implicit functions [NEW]