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Gnuplot> plot 'simple2.txt' using (2*$1):(5*exp( $2 ) ) # plot column 2 vs column 1, manipulating both first Gnuplot> plot 'simple2.txt' using ($1 - 10):2 # plot column 2 vs column 1, but shift the x axis by 10 Gnuplot> plot 'simple2.txt', 'simple2.txt' using 1:(1.5 * $1 + 1.1) # plot column 2 vs column 1 and and the line 1.5x + 1.1 using x values from column 1 Gnuplot> plot 'simple2.txt' using 1:($2*$1) # plot column 1 times column 2 vs column 1 The using command can be used to do some very powerful things Calculations involving columns can use data from any column. If a calculation involving columns is to be used, it must be enclosed with parenthesis and the columns are refered to with a '$' (similar to gawk). If an integer is given, the integer is taken to be the column number to use. For example, to multiply all y values by 4.5 and plotting the results, The using modifier selects the columns to use in the plot, but can also be used to manipulate the data before it is plotted. However, to plot the 3rd column of data, we add the using modifier. Plotting this file will give the same graph as the previous file. arrays x and y contain the x and y coordinates of our data This turns out to be very convenient because this is about the simplest format to write data to from within a program Gnuplot> plot 'simple.txt' # note the quotes. The first column is used for the x coordinates and the second column is used for the y coordinates, The simplest file that gnuplot can read contains just two columns of data points, Each row in the table is used to create one data point on the graph. Gnuplot reads plain text files in table format: one row per line with columns separated by white space. Here are two small text files containing data that can be used to follow the examples below. Typically this has either been generated from a computer model, or collected in an experiment. gnuplot makes it simple to quickly plot data stored in a plain text file. Gnuplot is very useful for plotting arbitrary functions, but it really shines when it comes to plotting data in a file. Gnuplot> plot gauss(0.5, 1, x), gauss2(x), gauss2(x/sigma) In other words, gnuplot variables have scope. Function argument names will 'hide' variable names. Note that the x0 and sigma in the function gauss defined above will not use the variables. This function will use the values stored in x0 and sigma when it is evaluated. You can set a variable, and then use it in plot commands or even function definitions.

The function can be plotted for any one of the arguments Note that, while we used the variable x in the definition of gauss, it is not required. User-defined functions can be plotted with the plot command.įunctions that take more than one argument can also be plotted. Gnuplot> function_name(arg1, ) = expression

Function definitions have the following form

Gnuplot allows the user to define arbitrary functions. See the #Plot Display Options section for a list of common options. Gnuplot> replot # redraw the previous plot with new options

#Gnuplot set key update

To update the plot, either reissue the same plot command, or just use the replot command. Gnuplot does not redraw the graph automatically after options are set. Gnuplot> set title 'Displacement of an Oscillating Spring' Gnuplot allows the way the plot is displayed to be configured by setting options. For example, you will want to label the axes and indicate their units. The default plot generated by gnuplot is not bad (the background isn't gray), but unless you are just quickly plotting something for your own use, you will need to change this. Multiple functions can be plotted on the same graph, just separate each with a comma Note that x is a special variable that gnuplot reconizes as the independent variable in a plot command. To plot a function, just give the function to plot to the plot command. Gnuplot> plot function | 'filename' datafile-modifiers Gnuplot is a program created to plot stuff.

#Gnuplot set key mac os x

Other Of course, gnuplot can be built from source on any other Unix based machine such as Mac OS X and Linux. Gnuplot can also be installed on Mac OS with MacPorts

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Now you will just unpack, configure, build and install gnuplot from source.

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Then download the gnuplot-4.6.0.tar.gz from here. Mac OS X First, download XQuartz from here and install.

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Windows A windows install file can be downloaded from the gnuplot sourceforge page here. The method of install will depend on your OS and distribution. If gnuplot is not already installed on your system, you need to install it.

2.1.1 User-Defined Functions and Variables.