Advanced Programming Guide

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4 Input and OutputAlthough Maple is primarily a system and language for performing mathematicalmanipulations, many situations arise where such manipulationsrequire:• Data originating outside Maple• Output of data in a form accepted by other applications• Input directly from the user• Output presented directly to the userThe Maple software includes a comprehensive collection of input andoutput (I/O) commands. Maple I/O library refers to these commandsas a group.In This Chapter• Tutorial Example• File Types and Modes• File Descriptors Versus File Names• File Manipulation Commands• Input Commands• Output Commands• Conversion Commands• Notes to C Programmers155
156 • Chapter 4: Input and Output4.1 A Tutorial ExampleThis section illustrates how you can use the Maple I/O library in yourwork. Specifically, the examples show how to write a table of numericaldata to a file, and how to read such a table from a file. The examples referto the following data set, given in the form of a list of lists and assumedto represent a list of (x, y) pairs, where each x is an integer and each y isa real number.> A := [[0, 0],> [1, .8427007929],> [2, .9953222650],> [3, .9999779095],> [4, .9999999846],> [5, 1.000000000]]:In a real application, this list is generated by a Maple command or procedure.In this example, the list was simply entered as above.If you want to use another program (like a presentation graphics program,or perhaps a custom C program) to process data that Maple hasgenerated, then you often need to save the data to a file in a format thatthe other program recognizes. Using the I/O library, you can write suchdata to a file.> for xy in A do fprintf("myfile", "%d %e\n", xy[1], xy[2]) end do:> fclose("myfile");The file myfile is saved in the current directory. To determine the currentdirectory, use the currentdir() command. If you print the file myfile,or view it with a text editor, it looks like this:0 0.000000e-011 8.427008e-012 9.953223e-013 9.999779e-014 1.000000e+005 1.000000e+00The fprintf command writes each pair of numbers to the file. This commandtakes two or more arguments. The first argument specifies the filethat Maple is to write, and the second argument specifies the format forthe data items. The remaining arguments are the actual data items thatMaple is to write.
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ii•Waterloo Maple Inc.57 Erb Stre
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Contents • v3.6 Interfaces and Im
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Contents • viiPlotting Gears . .
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Contents • ixForeign Data . . . .
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1 Introduction1.1 Purpose of This B
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2 Procedures, Variables,and Extendi
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2.1 Nested Procedures • 5procedur
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2.1 Nested Procedures • 7> A[j] :
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2.1 Nested Procedures • 9> quicks
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2.1 Nested Procedures • 11> U :=
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2.2 Procedures That Return Procedur
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2.2 Procedures That Return Procedur
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2.3 Local Variables and Invoking Pr
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assign(another_a = a);> eqn;2.3 Loc
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[ seq( s[j][c[j]], j=1..2 ) ];2.3 L
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2.3 Local Variables and Invoking Pr
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2.4 Interactive Input • 25Improve
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2.4 Interactive Input • 27> reads
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2.5 Extending Maple • 29The parse
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2.5 Extending Maple • 31> ‘type
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2.5 Extending Maple • 33The follo
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2.5 Extending Maple • 3556 IIn th
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2.5 Extending Maple • 37Extending
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2.5 Extending Maple • 39The useri
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3 Programming withModulesProcedures
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• 43> gentemp := proc()> count :=
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3.1 Syntax and Semantics3.1 Syntax
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3.1 Syntax and Semantics • 47name
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3.1 Syntax and Semantics • 49> He
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3.1 Syntax and Semantics • 51mode
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3.1 Syntax and Semantics • 53The
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3.1 Syntax and Semantics • 55true
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3.1 Syntax and Semantics • 57modu
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3.1 Syntax and Semantics • 59> m
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This is achieved by the double assi
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3.1 Syntax and Semantics • 63This
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3.1 Syntax and Semantics • 65With
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3.1 Syntax and Semantics • 67> wh
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SpecFuncs := module()> export F; #
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3.2 Records • 71b> evalb( % = b )
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3.3 Packages • 73Packages in the
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3.3 Packages • 751 −1 + 1 21k x
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3.3 Packages • 77> "new types ‘
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3.3 Packages • 79definition. This
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3.3 Packages • 81true> member( 10
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3.3 Packages • 83The display show
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3.3 Packages • 85> end module:How
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3.3 Packages • 87From the output
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3.3 Packages • 89The final output
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3.3 Packages • 91shape-specific f
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3.3 Packages • 93The area Procedu
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"but got %1", shape> end if;>> # Ex
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3.4 The use Statement • 97> circl
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3.4 The use Statement • 99use sta
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3.4 The use Statement • 101C++),
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3.5 Modeling Objects3.5 Modeling Ob
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Page 204 and 205: 5 Numerical Programmingin MapleFloa
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5.3 Floating-Point Models in Maple
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5.3 Floating-Point Models in Maple
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5.4 Extending the evalf Command •
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5.4 Extending the evalf Command •
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5.5 Using the Matlab Package • 21
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6 Programming with MapleGraphicsMap
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6.1 Basic Plot Functions • 217If
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6.2 Programming with Plotting Libra
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6.3 Maple Plotting Data Structures
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PLOT( CURVES( points ) );6.3 Maple
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6.4 Programming with Plot Data Stru
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6.5 Programming with the plottools
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6.6 Vector Field Plots • 257Examp
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6.6 Vector Field Plots • 259> end
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6.6 Vector Field Plots • 261input
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6.6 Vector Field Plots • 263> mak
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6.6 Vector Field Plots • 265> vec
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6.7 Generating Grids of Points •
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A := array(1..2, 1..2):> evalgrid(
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6.8 Animation • 271The gridpoints
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6.8 Animation • 2731.00.500. 0. 2
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6.8 Animation • 275> partsum := p
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6.8 Animation • 277Demonstrating
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plot3d( p, -3..3, -3..3, color=q );
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6.9 Programming with Color • 2811
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6.9 Programming with Color • 283>
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6.9 Programming with Color • 2851
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chessplot3d( sin(x)*sin(y), x=-Pi..
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7 Advanced ConnectivityIn This Chap
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7.1 Code Generation • 291Many opt
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7.2 Using Compiled Code in Maple
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7.3 System Integrity • 337by anot
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Table 7.3 Wrapper Compound TypesMap
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AInternal Representationand Manipul
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A.1 Internal Organization • 343wi
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A.2 Internal Representations of Dat
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Type Specification or TestA.2 Inter
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Length: 3 or moreA.2 Internal Repre
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A.3 The Use of Hashing in Maple •
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Index%, 174&, 31accuracy, 193, 195,
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Index • 375SAVE, 362SERIES, 363SE
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Index • 377defining numeric, 210n
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Index • 379name, 357name table, 3
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Index • 381statements, 174strings
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Waterloo Maple Inc.57 Erb Street We
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