GNUPlot Manual

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42 gnuplot 4.0 28 PLOT 28.1.4.6 Frequency The frequency option makes the data monotonic in x; points with the same x- value are replaced by a single point having the summed y-values. The resulting points are then connected by straight line segments. 28.1.5 Special-filenames A special filename of ’-’ specifies that the data are inline; i.e., they follow the command. Only the data follow the command; plot options like filters, titles, and line styles remain on the plot command line. This is similar to
28 PLOT gnuplot 4.0 43 pop(x) = 103*exp(-x/10) plot "< awk ’{print $1-1965, $2}’ population.dat", pop(x) would plot the same information as the first population example but with years since 1965 as the x axis. If you want to execute this example, you have to delete all comments from the data file above or substitute the following command for the first part of the command above (the part up to the comma): plot "< awk ’$0 !~ /^#/ {print $1-1965, $2}’ population.dat" While this approach is most flexible, it is possible to achieve simple filtering with the using or thru keywords. 28.1.6 Thru The thru function is provided for backward compatibility. Syntax: plot ’file’ thru f(x) It is equivalent to: plot ’file’ using 1:(f($2)) While the latter appears more complex, it is much more flexible. The more natural plot ’file’ thru f(y) also works (i.e. you can use y as the dummy variable). thru is parsed for splot and fit but has no effect. 28.1.7 Using The most common datafile modifier is using. Syntax: plot ’file’ using { {: {: ...}}} {’format’} If a format is specified, each datafile record is read using the C library’s ’scanf’ function, with the specified format string. Otherwise the record is read and broken into columns at spaces or tabs. A format cannot be specified if time-format data is being used (this must be done by set data time). The resulting array of data is then sorted into columns according to the entries. Each may be a simple column number, which selects the datum, an expression enclosed in parentheses, or empty. The expression can use $1 to access the first item read, $2 for the second item, and so on. It can also use column(x) and valid(x) where x is an arbitrary expression resulting in an integer. column(x) returns the x’th datum; valid(x) tests that the datum in the x’th column is a valid number. A column number of 0 generates a number increasing (from zero) with each point, and is reset upon encountering two blank records. A column number of -1 gives the dataline number, which starts at 0, increments at single blank records, and is reset at double blank records. A column number of -2 gives the index number, which is incremented only when two blank records are found. An empty will default to its order in the list of entries. For example, using ::4 is interpreted as using 1:2:4. N.B. — the call command also uses $’s as a special character. See call (p. 29) for details about how to include a column number in a call (p. 29) argument list. If the using list has but a single entry, that will be used for y and the data point number is used for x; for example, "plot ’file’ using 1" is identical to "plot ’file’ using 0:1". If the using list has two entries, these will be used for x and y. Additional entries are usually errors in x and/or y. See set style (p. 91) for details about plotting styles that make use of error information, and fit (p. 30) for use of error information in curve fitting. ’scanf’ accepts several numerical specifications but gnuplot requires all inputs to be double-precision floating-point variables, so lf is the only permissible specifier. ’scanf’ expects to see white space — a
Page 1 and 2: gnuplot An Interactive Plotting Pro
Page 3 and 4: CONTENTS gnuplot 4.0 3 12.1 Bind .
Page 5 and 6: CONTENTS gnuplot 4.0 5 36.9 Clip .
Page 7 and 8: CONTENTS gnuplot 4.0 7 36.57.6.18 Y
Page 9 and 10: CONTENTS gnuplot 4.0 9 36.59.62 Svg
Page 11 and 12: CONTENTS gnuplot 4.0 11 36.114Cbtic
Page 13 and 14: 3 SEEKING-ASSISTANCE gnuplot 4.0 13
Page 15 and 16: 4 WHAT IS NEW IN VERSION 4.0 gnuplo
Page 17 and 18: 6 COMMAND-LINE-EDITING gnuplot 4.0
Page 19 and 20: 10 EXPRESSIONS gnuplot 4.0 19 FIT S
Page 21 and 22: 10 EXPRESSIONS gnuplot 4.0 21 other
Page 23 and 24: 11 GLOSSARY gnuplot 4.0 23 10.3 Use
Page 25 and 26: 13 PLOTTING gnuplot 4.0 25 ctrl, al
Page 27 and 28: 17 TIME/DATE DATA gnuplot 4.0 27 co
Page 29 and 30: 21 EXIT gnuplot 4.0 29 19 Call The
Page 31 and 32: 22 FIT gnuplot 4.0 31 current param
Page 33 and 34: 22 FIT gnuplot 4.0 33 though the st
Page 35 and 36: 22 FIT gnuplot 4.0 35 (branch) for
Page 37 and 38: 26 LOAD gnuplot 4.0 37 if () [; el
Page 39 and 40: 28 PLOT gnuplot 4.0 39 28.1 Data-fi
Page 41: 28 PLOT gnuplot 4.0 41 28.1.4 Smoot
Page 45 and 46: 28 PLOT gnuplot 4.0 45 (x, y, ydelt
Page 47 and 48: 28 PLOT gnuplot 4.0 47 This is the
Page 49 and 50: 31 QUIT gnuplot 4.0 49 This plots "
Page 51 and 52: 35 SAVE gnuplot 4.0 51 unset key se
Page 53 and 54: 36 SET-SHOW gnuplot 4.0 53 {linewid
Page 55 and 56: 36 SET-SHOW gnuplot 4.0 55 This dis
Page 57 and 58: 36 SET-SHOW gnuplot 4.0 57 Draw def
Page 59 and 60: 36 SET-SHOW gnuplot 4.0 59 set cntr
Page 61 and 62: 36 SET-SHOW gnuplot 4.0 61 36.12 Co
Page 63 and 64: 36 SET-SHOW gnuplot 4.0 63 36.14.3
Page 65 and 66: 36 SET-SHOW gnuplot 4.0 65 36.18 En
Page 67 and 68: 36 SET-SHOW gnuplot 4.0 67 Tic-mark
Page 69 and 70: 36 SET-SHOW gnuplot 4.0 69 36.24 Gr
Page 71 and 72: 36 SET-SHOW gnuplot 4.0 71 the edge
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Page 77 and 78: 36 SET-SHOW gnuplot 4.0 77 36.35 Ma
Page 79 and 80: 36 SET-SHOW gnuplot 4.0 79 For some
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Page 91 and 92: 36 SET-SHOW gnuplot 4.0 91 By defau
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36 SET-SHOW gnuplot 4.0 93 Examples
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36 SET-SHOW gnuplot 4.0 95 The type
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36 SET-SHOW gnuplot 4.0 97 36.57.6.
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36 SET-SHOW gnuplot 4.0 99 36.57.6.
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36 SET-SHOW gnuplot 4.0 101 36.59.5
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36 SET-SHOW gnuplot 4.0 105 CGM fon
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36 SET-SHOW gnuplot 4.0 107 where t
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36 SET-SHOW gnuplot 4.0 111 Additio
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36 SET-SHOW gnuplot 4.0 113 set ter
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36 SET-SHOW gnuplot 4.0 115 is lan
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36 SET-SHOW gnuplot 4.0 117 PNG/JPE
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36 SET-SHOW gnuplot 4.0 121 Changin
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36 SET-SHOW gnuplot 4.0 123 set ter
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36 SET-SHOW gnuplot 4.0 125 Type 1
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36 SET-SHOW gnuplot 4.0 127 Several
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36 SET-SHOW gnuplot 4.0 129 in prog
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36 SET-SHOW gnuplot 4.0 133 set ori
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36 SET-SHOW gnuplot 4.0 135 The cha
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36 SET-SHOW gnuplot 4.0 137 System
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36 SET-SHOW gnuplot 4.0 139 or [no]
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36 SET-SHOW gnuplot 4.0 141 gnuplot
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36 SET-SHOW gnuplot 4.0 143 36.62 T
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36 SET-SHOW gnuplot 4.0 145 36.68 U
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36 SET-SHOW gnuplot 4.0 147 See als
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36 SET-SHOW gnuplot 4.0 149 In 2-d,
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36 SET-SHOW gnuplot 4.0 151 set xda
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36 SET-SHOW gnuplot 4.0 153 set zer
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38 SPLOT gnuplot 4.0 155 splot {}
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38 SPLOT gnuplot 4.0 157 Note that
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43 OLD BUGS gnuplot 4.0 159 be "old
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