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72 gnuplot 4.3 60 PLOT 60.2.6.1 Acsplines The acsplines option approximates the data with a "natural smoothing spline". After the data are made monotonic in x (see smooth unique (p. 72)), a curve is piecewise constructed from segments of cubic polynomials whose coefficients are found by the weighting the data points; the weights are taken from the third column in the data file. That default can be modified by the third entry in the using list, e.g., plot ’data-file’ using 1:2:(1.0) smooth acsplines Qualitatively, the absolute magnitude of the weights determines the number of segments used to construct the curve. If the weights are large, the effect of each datum is large and the curve approaches that produced by connecting consecutive points with natural cubic splines. If the weights are small, the curve is composed of fewer segments and thus is smoother; the limiting case is the single segment produced by a weighted linear least squares fit to all the data. The smoothing weight can be expressed in terms of errors as a statistical weight for a point divided by a "smoothing factor" for the curve so that (standard) errors in the file can be used as smoothing weights. Example: sw(x,S)=1/(x*x*S) plot ’data_file’ using 1:2:(sw($3,100)) smooth acsplines 60.2.6.2 Bezier The bezier option approximates the data with a Bezier curve of degree n (the number of data points) that connects the endpoints. 60.2.6.3 Csplines The csplines option connects consecutive points by natural cubic splines after rendering the data monotonic (see smooth unique (p. 72)). 60.2.6.4 Sbezier The sbezier option first renders the data monotonic (unique) and then applies the bezier algorithm. 60.2.6.5 Unique The unique option makes the data monotonic in x; points with the same x-value are replaced by a single point having the average y-value. The resulting points are then connected by straight line segments. demos 60.2.6.6 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. 60.2.7 Special-filenames There are three filenames that have a special meaning: ’ ’, ’-’, and ’+’. The empty filename ’ ’ tells gnuplot to re-use the previous input file in the same plot command. So to plot two columns from the same input file: plot ’filename’ using 1:2, ’’ using 1:3 The special filename ’+’ is a mechanism to allow the full range of using specifiers and plot styles with in-line functions. Normally a function plot can only have a single y (or z) value associated with each sampled point. The pseudo-file ’+’ treats the sampled points as columns 1 (plot) or 1 and 2 (splot), and allows additional column values to be specified via a using specification, just as for a true input file. Example: plot ’+’ using ($1):(sin($1)):(sin($1)**2) with filledcurves
60 PLOT gnuplot 4.3 73 The special filename ’-’ 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
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gnuplot An Interactive Plotting Pro
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CONTENTS gnuplot 4.3 3 6.5 New plot
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CONTENTS gnuplot 4.3 5 40 Rgbimage
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CONTENTS gnuplot 4.3 7 60.2.9.5 Y2t
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CONTENTS gnuplot 4.3 9 70.47 Parame
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CONTENTS gnuplot 4.3 11 70.115Zrang
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CONTENTS gnuplot 4.3 13 77.44 Mif .
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2 INTRODUCTION gnuplot 4.3 15 Part
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4 NEW FEATURES INTRODUCED IN VERSIO
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5 BACKWARDS COMPATIBILITY gnuplot 4
Page 21 and 22: 6 FEATURES INTRODUCED IN VERSIONgnu
Page 23 and 24: 9 COMMENTS gnuplot 4.3 23 (The read
Page 25 and 26: 13 EXPRESSIONS gnuplot 4.3 25 12 En
Page 27 and 28: 13 EXPRESSIONS gnuplot 4.3 27 Math
Page 29 and 30: 13 EXPRESSIONS gnuplot 4.3 29 The f
Page 31 and 32: 15 LINETYPE, COLORS, AND STYLES gnu
Page 33 and 34: 16 MOUSE INPUT gnuplot 4.3 33 rgbco
Page 35 and 36: 17 PLOTTING gnuplot 4.3 35 16.1.1 B
Page 37 and 38: 20 SUBSTITUTION AND COMMAND LINE gn
Page 39 and 40: 22 TIME/DATE DATA gnuplot 4.3 39 At
Page 41 and 42: 24 BOXES gnuplot 4.3 41 The boxwidt
Page 43 and 44: 28 FILLEDCURVES gnuplot 4.3 43 . No
Page 45 and 46: 32 HISTOGRAMS gnuplot 4.3 45 The fs
Page 47 and 48: 33 IMAGE gnuplot 4.3 47 This will p
Page 49 and 50: 39 STEPS gnuplot 4.3 49 The labels
Page 51 and 52: 46 XYERRORLINES gnuplot 4.3 51 The
Page 53 and 54: 49 CD gnuplot 4.3 53 The splot comm
Page 55 and 56: 53 FIT gnuplot 4.3 55 If input stre
Page 57 and 58: 53 FIT gnuplot 4.3 57 z=a*sin(c*x)
Page 59 and 60: 53 FIT gnuplot 4.3 59 the statistic
Page 61 and 62: 55 HISTORY gnuplot 4.3 61 good star
Page 63 and 64: 59 PAUSE gnuplot 4.3 63 load ’wor
Page 65 and 66: 60 PLOT gnuplot 4.3 65 plot ’’
Page 67 and 68: 60 PLOT gnuplot 4.3 67 The keyword
Page 69 and 70: 60 PLOT gnuplot 4.3 69 60.2.2.6.4 F
Page 71: 60 PLOT gnuplot 4.3 71 # Gnu popula
Page 75 and 76: 60 PLOT gnuplot 4.3 75 In this exam
Page 77 and 78: 60 PLOT gnuplot 4.3 77 60.4 Errorli
Page 79 and 80: 60 PLOT gnuplot 4.3 79 Example: fil
Page 81 and 82: 61 PRINT gnuplot 4.3 81 Examples: T
Page 83 and 84: 67 REREAD gnuplot 4.3 83 Arguments
Page 85 and 86: 70 SET-SHOW gnuplot 4.3 85 If a var
Page 87 and 88: 70 SET-SHOW gnuplot 4.3 87 To draw
Page 89 and 90: 70 SET-SHOW gnuplot 4.3 89 set bars
Page 91 and 92: 70 SET-SHOW gnuplot 4.3 91 set boxw
Page 93 and 94: 70 SET-SHOW gnuplot 4.3 93 If the c
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Page 97 and 98: 70 SET-SHOW gnuplot 4.3 97 Examples
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Page 113 and 114: 70 SET-SHOW gnuplot 4.3 113 The key
Page 115 and 116: 70 SET-SHOW gnuplot 4.3 115 Any lab
Page 117 and 118: 70 SET-SHOW gnuplot 4.3 117 70.44 O
Page 119 and 120: 70 SET-SHOW gnuplot 4.3 119 Files:
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70 SET-SHOW gnuplot 4.3 123 ). http
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70 SET-SHOW gnuplot 4.3 125 70.50.3
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70 SET-SHOW gnuplot 4.3 127 70.52 P
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70 SET-SHOW gnuplot 4.3 129 70.57 S
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70 SET-SHOW gnuplot 4.3 131 they ma
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70 SET-SHOW gnuplot 4.3 133 plot f1
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70 SET-SHOW gnuplot 4.3 135 set tab
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70 SET-SHOW gnuplot 4.3 137 termina
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70 SET-SHOW gnuplot 4.3 139 show ve
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70 SET-SHOW gnuplot 4.3 141 70.86 X
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70 SET-SHOW gnuplot 4.3 143 Ranges
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70 SET-SHOW gnuplot 4.3 145 set xti
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70 SET-SHOW gnuplot 4.3 147 70.100
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71 SHELL gnuplot 4.3 149 70.116 Zti
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72 SPLOT gnuplot 4.3 151 Single bla
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72 SPLOT gnuplot 4.3 153 allows to
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77 TERMINAL gnuplot 4.3 155 Part IV
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77 TERMINAL gnuplot 4.3 157 Plot wi
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77 TERMINAL gnuplot 4.3 159 by six
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77 TERMINAL gnuplot 4.3 161 Example
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77 TERMINAL gnuplot 4.3 163 120x80
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77 TERMINAL gnuplot 4.3 165 {dashle
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77 TERMINAL gnuplot 4.3 167 Use Hel
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77 TERMINAL gnuplot 4.3 169 Availab
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77 TERMINAL gnuplot 4.3 171 which u
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77 TERMINAL gnuplot 4.3 173 where r
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77 TERMINAL gnuplot 4.3 175 file, o
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77 TERMINAL gnuplot 4.3 177 77.42 M
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77 TERMINAL gnuplot 4.3 179 set ter
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77 TERMINAL gnuplot 4.3 181 The adv
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77 TERMINAL gnuplot 4.3 183 77.51 P
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77 TERMINAL gnuplot 4.3 185 If you
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77 TERMINAL gnuplot 4.3 187 ’abc&
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77 TERMINAL gnuplot 4.3 189 If the
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77 TERMINAL gnuplot 4.3 191 PSTrick
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77 TERMINAL gnuplot 4.3 193 Syntax:
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77 TERMINAL gnuplot 4.3 195 77.68 U
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77 TERMINAL gnuplot 4.3 197 Print..
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77 TERMINAL gnuplot 4.3 199 Syntax:
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77 TERMINAL gnuplot 4.3 201 The opt
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77 TERMINAL gnuplot 4.3 203 77.76.4
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gnuplot 4.3 205 gnuplot*maxcolors:
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Index .gnuplot, 36 abs, 27 acos, 27
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INDEX gnuplot 4.3 209 isosamples, 3
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INDEX gnuplot 4.3 211 substitution,
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