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Chapter 6Programming Facilities6.1 ExpressionsWherever GLE is expecting a number it can be replaced with an expression. For exampleandrline 3 2rline 9/3 sqrt(4)will produce the same result.An expression in GLE is delimited by white space, so it may not contain any spaces - ‘rline 3*3 2’ is validbut ‘rline 3 * 3 2’ will not work.Or ‘let d2 = 3+sin(d1)’ will work and ‘let d2= 3 + sin(d1)’ won’t.Expressions may contain numbers, arithmetic operators (+, -, *, /, ^ (to the power of)), relationaloperators (>, ,
48 CHAPTER 6. PROGRAMMING FACILITIESeng 3 append geng 3 10 numeng 3 appendsci 0 10 expdigits 2 expsignpifracfix 20.00 g 500 g 1.00 kg 1.50 kg 2.00 kg1.00 10 -6 100 10 -6 10.0 10 -3 1.00 10 0 100 10 0 10.0 10 3 1.00 10 61.00 100 10.0 m 1.00 100 10.0 k 1.00 M10 -06 10 -04 10 -02 10 +00 10 +02 10 +04 10 +060 /2 3 /2 2-1 -3/4 -1/2 -1/4 0 1/4 1/2 3/4 1-1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00Figure 6.1: Examples of number formatting options.gle -o beans.eps graph.gle "Beans" "beans.csv"gle -o peas.eps graph.gle "Peas" "peas.csv"This will create two graphs: “beans.eps” and “peas.eps”. The arg() functions can be used at allplaces in the script where an expression is expected. They can even be used in place of GLEcommands in a graph block by means of the \expr() function. For example,data "file.csv"d\expr{arg(1)} line color redin the graph block will allow one to draw different datasets from a single file on multiple graphs.To do so, run:gle -o d1.eps graph.gle 1gle -o d2.eps graph.gle 2dataxvalue(ds,i), datayvalue(ds,i), ndata(ds)These functions can be used to retrieve the data values from a given dataset. They only work afterdata has been loaded by means of a graph block (Ch. 4).A dataset is specified with a dataset identifier ds (a string of the form “di”, with i an integer).The function ‘ndata’ returns the number of points in the dataset, and the functions ‘dataxvalue’ and‘datayvalue’ return the x and y values of point i, where i ranges from 1 to ndata(ds).The following example shows how these functions can be used to compute the maximum of a dataset:sub dmaxy ds$local crmax = datayvalue(ds$,1)for i = 2 to ndata(ds$)crmax = max(crmax, datayvalue(ds$,i))next ireturn crmaxend subThis subroutine together with other subroutines for computing the minimum, mean, area, etc. ofa dataset are defined in the include file ‘graphutil.gle’, which is distributed together with GLE.format$(exp,format)Returns a string representation of exp formatted as specified in format.Basic formats:• append s: appends the string s after the formatted number. This can be used to add a unit.
Page 1: Professional Graphics LanguageProfe
Page 4 and 5: ivCONTENTS7.2.4 Import a GLE Figure
Page 6 and 7: 1• Chapter 4, The Graph Module:De
Page 8 and 9: Chapter 2Tutorial2.1 Installing GLE
Page 10 and 11: 2.4. DRAWING A SIMPLE GRAPH 5gle -p
Page 12 and 13: Chapter 3PrimitivesA GLE command is
Page 14 and 15: 3.2. GRAPHICS PRIMITIVES (IN DETAIL
Page 28 and 29: Chapter 4The Graph ModuleA graph sh
Page 30 and 31: 4.2. GRAPH COMMANDS (IN DETAIL) 25b
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Page 36 and 37: 4.2. GRAPH COMMANDS (IN DETAIL) 31a
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Page 42 and 43: 4.3. BAR GRAPHS 37Planet sizesNeptu
Page 44 and 45: 4.6. NOTES ON DRAWING GRAPHS 394.6
Page 46 and 47: Chapter 5The Key ModuleThe key modu
Page 48 and 49: 5.2. ENTRY DEFINITION COMMANDS 43ju
Page 50 and 51: 5.3. DEFINING THE KEY IN THE GRAPH
Page 54 and 55: 6.2. FUNCTIONS INSIDE EXPRESSIONS 4
Page 56 and 57: 6.5. IF-THEN-ELSE 51Besides for-nex
Page 58 and 59: 6.9. DEVICE DEPENDEND CONTROL 53fwr
Page 60 and 61: Chapter 7Advanced FeaturesThis chap
Page 62 and 63: 7.1. DIAGRAMS 57GRVCheeseCHVGoatsMa
Page 64 and 65: 7.2. L A TEX INTERFACE 59house.wind
Page 66 and 67: 7.4. COLOUR 61size 10 5begin clip !
Page 68 and 69: Chapter 8Surface and Contour Plots8
Page 70 and 71: 8.1. SURFACE PRIMITIVES 65ylines of
Page 72 and 73: 8.2. LETZ 67zclip [min v1 ] [max v2
Page 74 and 75: 8.5. COLOR MAPS 69• pixels-x, pix
Page 76 and 77: Chapter 9GLE Utilities9.1 FitlsThe
Page 78 and 79: 9.2. MANIP 73c1 == c1c1r1r10 == 1,1
Page 80 and 81: 9.2. MANIP 75BLANK"% BLANK C2C3" Cl
Page 82 and 83: 9.2. MANIP 77PARSUM [range1] [range
Page 84 and 85: Appendix ATablesA.1 Markerstriangle
Page 86 and 87: A.2. FUNCTIONS AND VARIABLES 81widt
Page 88 and 89: A.4. INSTALLING GLE 83A.4 Installin
Page 90 and 91: A.6. FONT TABLES 85Typewriter (tt)0
Page 92 and 93: A.6. FONT TABLES 87TEXComputer Mode
Page 94 and 95: A.6. FONT TABLES 89PostScript Helve
Page 96 and 97: A.6. FONT TABLES 91(psbl)0246810121
Page 98 and 99: A.6. FONT TABLES 93PostScript ZapfC
Page 100 and 101: A.7. PREDEFINED COLORS 95GLE suppor
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Index!, 8, 25\expr(exp), 80.z file,
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INDEX 99histogram, 30horiz, 37horiz
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INDEX 101under, 32underneath, 66Uni
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