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|00000000| 5c 63 68 61 70 74 65 72 | 20 7b 53 69 6d 70 6c 65 |\chapter| {Simple|
|00000010| 20 55 73 65 20 6f 66 20 | 50 4c 50 4c 4f 54 7d 20 | Use of |PLPLOT} |
|00000020| 5c 6c 61 62 65 6c 7b 73 | 69 6d 70 6c 65 7d 0a 0a |\label{s|imple}..|
|00000030| 5c 73 65 63 74 69 6f 6e | 20 7b 50 6c 6f 74 74 69 |\section| {Plotti|
|00000040| 6e 67 20 61 20 53 69 6d | 70 6c 65 20 47 72 61 70 |ng a Sim|ple Grap|
|00000050| 68 7d 0a 57 65 20 73 68 | 61 6c 6c 20 66 69 72 73 |h}.We sh|all firs|
|00000060| 74 20 63 6f 6e 73 69 64 | 65 72 20 70 6c 6f 74 74 |t consid|er plott|
|00000070| 69 6e 67 20 73 69 6d 70 | 6c 65 20 67 72 61 70 68 |ing simp|le graph|
|00000080| 73 20 73 68 6f 77 69 6e | 67 20 74 68 65 20 64 65 |s showin|g the de|
|00000090| 70 65 6e 64 65 6e 63 65 | 20 0a 6f 66 20 6f 6e 65 |pendence| .of one|
|000000a0| 20 76 61 72 69 61 62 6c | 65 20 75 70 6f 6e 20 61 | variabl|e upon a|
|000000b0| 6e 6f 74 68 65 72 2e 20 | 53 75 63 68 20 61 20 67 |nother. |Such a g|
|000000c0| 72 61 70 68 20 6d 61 79 | 20 62 65 20 63 6f 6d 70 |raph may| be comp|
|000000d0| 6f 73 65 64 20 6f 66 20 | 73 65 76 65 72 61 6c 20 |osed of |several |
|000000e0| 0a 65 6c 65 6d 65 6e 74 | 73 3a 0a 5c 62 65 67 69 |.element|s:.\begi|
|000000f0| 6e 7b 69 74 65 6d 69 7a | 65 7d 0a 20 20 20 5c 69 |n{itemiz|e}.   \i|
|00000100| 74 65 6d 20 41 20 62 6f | 78 20 77 68 69 63 68 20 |tem A bo|x which |
|00000110| 64 65 66 69 6e 65 73 20 | 74 68 65 20 72 61 6e 67 |defines |the rang|
|00000120| 65 73 20 6f 66 20 74 68 | 65 20 76 61 72 69 61 62 |es of th|e variab|
|00000130| 6c 65 73 2c 20 70 65 72 | 68 61 70 73 20 77 69 74 |les, per|haps wit|
|00000140| 68 20 61 78 65 73 0a 20 | 20 20 20 20 20 20 20 20 |h axes. |        |
|00000150| 61 6e 64 20 6e 75 6d 65 | 72 69 63 20 6c 61 62 65 |and nume|ric labe|
|00000160| 6c 73 20 61 6c 6f 6e 67 | 20 69 74 73 20 65 64 67 |ls along| its edg|
|00000170| 65 73 2c 0a 20 20 20 5c | 69 74 65 6d 20 41 20 73 |es,.   \|item A s|
|00000180| 65 74 20 6f 66 20 70 6f | 69 6e 74 73 20 6f 72 20 |et of po|ints or |
|00000190| 6c 69 6e 65 73 20 77 69 | 74 68 69 6e 20 74 68 65 |lines wi|thin the|
|000001a0| 20 62 6f 78 20 73 68 6f | 77 69 6e 67 20 74 68 65 | box sho|wing the|
|000001b0| 20 66 75 6e 63 74 69 6f | 6e 61 6c 20 0a 20 20 20 | functio|nal .   |
|000001c0| 20 20 20 20 20 20 64 65 | 70 65 6e 64 65 6e 63 65 |      de|pendence|
|000001d0| 2c 0a 20 20 20 5c 69 74 | 65 6d 20 41 20 73 65 74 |,.   \it|em A set|
|000001e0| 20 6f 66 20 6c 61 62 65 | 6c 73 20 66 6f 72 20 74 | of labe|ls for t|
|000001f0| 68 65 20 76 61 72 69 61 | 62 6c 65 73 20 61 6e 64 |he varia|bles and|
|00000200| 20 61 20 74 69 74 6c 65 | 20 66 6f 72 20 74 68 65 | a title| for the|
|00000210| 20 67 72 61 70 68 2e 0a | 5c 65 6e 64 7b 69 74 65 | graph..|\end{ite|
|00000220| 6d 69 7a 65 7d 20 20 20 | 0a 49 6e 20 6f 72 64 65 |mize}   |.In orde|
|00000230| 72 20 74 6f 20 64 72 61 | 77 20 73 75 63 68 20 61 |r to dra|w such a|
|00000240| 20 67 72 61 70 68 2c 20 | 69 74 20 69 73 20 6e 65 | graph, |it is ne|
|00000250| 63 65 73 73 61 72 79 20 | 74 6f 20 63 61 6c 6c 20 |cessary |to call |
|00000260| 61 74 20 6c 65 61 73 74 | 20 66 6f 75 72 20 6f 66 |at least| four of|
|00000270| 20 0a 74 68 65 20 50 4c | 50 4c 4f 54 20 66 75 6e | .the PL|PLOT fun|
|00000280| 63 74 69 6f 6e 73 3a 0a | 5c 62 65 67 69 6e 7b 65 |ctions:.|\begin{e|
|00000290| 6e 75 6d 65 72 61 74 65 | 7d 0a 20 20 20 5c 69 74 |numerate|}.   \it|
|000002a0| 65 6d 20 7b 5c 74 74 20 | 70 6c 73 74 61 72 7d 2c |em {\tt |plstar},|
|000002b0| 20 74 6f 20 73 70 65 63 | 69 66 79 20 74 68 65 20 | to spec|ify the |
|000002c0| 64 65 76 69 63 65 20 79 | 6f 75 20 77 61 6e 74 20 |device y|ou want |
|000002d0| 74 6f 20 70 6c 6f 74 20 | 6f 6e 2c 0a 20 20 20 5c |to plot |on,.   \|
|000002e0| 69 74 65 6d 20 7b 5c 74 | 74 20 70 6c 65 6e 76 7d |item {\t|t plenv}|
|000002f0| 2c 20 74 6f 20 64 65 66 | 69 6e 65 20 74 68 65 20 |, to def|ine the |
|00000300| 72 61 6e 67 65 20 61 6e | 64 20 73 63 61 6c 65 20 |range an|d scale |
|00000310| 6f 66 20 74 68 65 20 67 | 72 61 70 68 2c 20 61 6e |of the g|raph, an|
|00000320| 64 0a 20 20 20 20 20 20 | 20 20 20 20 20 20 20 20 |d.      |        |
|00000330| 20 20 20 20 20 20 20 20 | 64 72 61 77 20 6c 61 62 |        |draw lab|
|00000340| 65 6c 73 2c 20 61 78 65 | 73 2c 20 65 74 63 2e 2c |els, axe|s, etc.,|
|00000350| 0a 20 20 20 5c 69 74 65 | 6d 20 4f 6e 65 20 6f 72 |.   \ite|m One or|
|00000360| 20 6d 6f 72 65 20 63 61 | 6c 6c 73 20 74 6f 20 7b | more ca|lls to {|
|00000370| 5c 74 74 20 70 6c 6c 69 | 6e 65 7d 20 6f 72 20 7b |\tt plli|ne} or {|
|00000380| 5c 74 74 20 70 6c 70 6f | 69 6e 7d 20 74 6f 20 64 |\tt plpo|in} to d|
|00000390| 72 61 77 0a 20 20 20 20 | 20 20 20 20 20 6c 69 6e |raw.    |     lin|
|000003a0| 65 73 20 6f 72 20 70 6f | 69 6e 74 73 20 61 73 20 |es or po|ints as |
|000003b0| 6e 65 65 64 65 64 2e 20 | 4f 74 68 65 72 20 6d 6f |needed. |Other mo|
|000003c0| 72 65 20 63 6f 6d 70 6c | 65 78 20 72 6f 75 74 69 |re compl|ex routi|
|000003d0| 6e 65 73 20 69 6e 63 6c | 75 64 65 0a 20 20 20 20 |nes incl|ude.    |
|000003e0| 20 20 20 20 20 7b 5c 74 | 74 20 70 6c 62 69 6e 7d |     {\t|t plbin}|
|000003f0| 20 61 6e 64 20 7b 5c 74 | 74 20 70 6c 68 69 73 74 | and {\t|t plhist|
|00000400| 7d 20 74 6f 20 64 72 61 | 77 20 68 69 73 74 6f 67 |} to dra|w histog|
|00000410| 72 61 6d 73 2c 20 7b 5c | 74 74 20 70 6c 65 72 72 |rams, {\|tt plerr|
|00000420| 78 7d 20 61 6e 64 20 0a | 20 20 20 20 20 20 20 20 |x} and .|        |
|00000430| 20 7b 5c 74 74 20 70 6c | 65 72 72 79 7d 20 74 6f | {\tt pl|erry} to|
|00000440| 20 64 72 61 77 20 65 72 | 72 6f 72 2d 62 61 72 73 | draw er|ror-bars|
|00000450| 2c 20 5c 6c 61 62 65 6c | 7b 64 72 61 77 7d 0a 20 |, \label|{draw}. |
|00000460| 20 20 5c 69 74 65 6d 20 | 7b 5c 74 74 20 70 6c 65 |  \item |{\tt ple|
|00000470| 6e 64 7d 2c 20 74 6f 20 | 63 6c 6f 73 65 20 74 68 |nd}, to |close th|
|00000480| 65 20 70 6c 6f 74 2e 0a | 5c 65 6e 64 7b 65 6e 75 |e plot..|\end{enu|
|00000490| 6d 65 72 61 74 65 7d 0a | 4d 6f 72 65 20 74 68 61 |merate}.|More tha|
|000004a0| 6e 20 6f 6e 65 20 67 72 | 61 70 68 20 63 61 6e 20 |n one gr|aph can |
|000004b0| 62 65 20 64 72 61 77 6e | 20 6f 6e 20 61 20 73 69 |be drawn| on a si|
|000004c0| 6e 67 6c 65 20 73 65 74 | 20 6f 66 20 61 78 65 73 |ngle set| of axes|
|000004d0| 20 62 79 20 6d 61 6b 69 | 6e 67 0a 72 65 70 65 61 | by maki|ng.repea|
|000004e0| 74 65 64 20 63 61 6c 6c | 73 20 74 6f 20 74 68 65 |ted call|s to the|
|000004f0| 20 72 6f 75 74 69 6e 65 | 73 20 6c 69 73 74 65 64 | routine|s listed|
|00000500| 20 69 6e 20 69 74 65 6d | 20 5c 72 65 66 7b 64 72 | in item| \ref{dr|
|00000510| 61 77 7d 20 61 62 6f 76 | 65 2e 20 54 68 65 20 72 |aw} abov|e. The r|
|00000520| 6f 75 74 69 6e 65 0a 7b | 5c 74 74 20 70 6c 73 74 |outine.{|\tt plst|
|00000530| 61 72 7d 20 6e 65 65 64 | 73 20 74 6f 20 62 65 20 |ar} need|s to be |
|00000540| 63 61 6c 6c 65 64 20 6f | 6e 6c 79 20 6f 6e 63 65 |called o|nly once|
|00000550| 2c 20 75 6e 6c 65 73 73 | 20 61 20 64 69 66 66 65 |, unless| a diffe|
|00000560| 72 65 6e 74 20 6f 75 74 | 70 75 74 20 64 65 76 69 |rent out|put devi|
|00000570| 63 65 0a 69 73 20 72 65 | 71 75 69 72 65 64 2e 0a |ce.is re|quired..|
|00000580| 0a 5c 73 65 63 74 69 6f | 6e 20 7b 53 74 61 72 74 |.\sectio|n {Start|
|00000590| 69 6e 67 20 50 4c 50 4c | 4f 54 7d 20 5c 6c 61 62 |ing PLPL|OT} \lab|
|000005a0| 65 6c 7b 73 74 61 72 74 | 69 6e 67 75 70 7d 0a 53 |el{start|ingup}.S|
|000005b0| 75 62 72 6f 75 74 69 6e | 65 20 7b 5c 74 74 20 70 |ubroutin|e {\tt p|
|000005c0| 6c 73 74 61 72 7d 20 73 | 65 6c 65 63 74 73 20 61 |lstar} s|elects a|
|000005d0| 20 67 72 61 70 68 69 63 | 73 20 64 65 76 69 63 65 | graphic|s device|
|000005e0| 20 6f 72 20 6f 70 65 6e | 73 20 61 20 64 69 73 6b | or open|s a disk|
|000005f0| 20 66 69 6c 65 20 74 6f | 0a 72 65 63 65 69 76 65 | file to|.receive|
|00000600| 20 61 20 70 6c 6f 74 20 | 66 6f 72 20 6c 61 74 65 | a plot |for late|
|00000610| 72 20 64 69 73 70 6c 61 | 79 2e 20 49 66 20 7b 5c |r displa|y. If {\|
|00000620| 74 74 20 70 6c 73 74 61 | 72 7d 20 69 73 20 63 61 |tt plsta|r} is ca|
|00000630| 6c 6c 65 64 20 61 67 61 | 69 6e 20 64 75 72 69 6e |lled aga|in durin|
|00000640| 67 0a 61 20 70 72 6f 67 | 72 61 6d 2c 20 74 68 65 |g.a prog|ram, the|
|00000650| 20 70 72 65 76 69 6f 75 | 73 6c 79 20 6f 70 65 6e | previou|sly open|
|00000660| 65 64 20 66 69 6c 65 20 | 77 69 6c 6c 20 62 65 20 |ed file |will be |
|00000670| 63 6c 6f 73 65 64 2e 20 | 57 68 65 6e 20 63 61 6c |closed. |When cal|
|00000680| 6c 65 64 2c 0a 74 68 65 | 20 75 73 65 72 20 69 73 |led,.the| user is|
|00000690| 20 70 72 6f 6d 70 74 65 | 64 20 66 6f 72 20 61 20 | prompte|d for a |
|000006a0| 6e 75 6d 62 65 72 20 72 | 65 70 72 65 73 65 6e 74 |number r|epresent|
|000006b0| 69 6e 67 20 74 68 65 20 | 64 65 76 69 63 65 20 6f |ing the |device o|
|000006c0| 6e 20 77 68 69 63 68 20 | 0a 74 68 65 20 70 6c 6f |n which |.the plo|
|000006d0| 74 20 69 73 20 74 6f 20 | 61 70 70 65 61 72 2e 20 |t is to |appear. |
|000006e0| 54 68 65 20 73 79 6e 74 | 61 78 20 66 6f 72 20 7b |The synt|ax for {|
|000006f0| 5c 74 74 20 70 6c 73 74 | 61 72 7d 20 69 73 3a 0a |\tt plst|ar} is:.|
|00000700| 0a 5c 6e 61 6d 65 7b 70 | 6c 73 74 61 72 28 6e 78 |.\name{p|lstar(nx|
|00000710| 2c 6e 79 29 3b 7d 0a 5c | 61 72 67 75 7b 7b 5c 74 |,ny);}.\|argu{{\t|
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|00000730| 69 6e 70 75 74 29 7d 0a | 7b 54 68 65 20 6e 75 6d |input)}.|{The num|
|00000740| 62 65 72 20 6f 66 20 70 | 6c 6f 74 73 20 74 6f 20 |ber of p|lots to |
|00000750| 61 20 70 61 67 65 2e 20 | 54 68 65 20 70 61 67 65 |a page. |The page|
|00000760| 20 69 73 20 64 69 76 69 | 64 65 64 20 69 6e 74 6f | is divi|ded into|
|00000770| 20 0a 7b 5c 74 74 20 6e | 78 7d 7e 24 5c 74 69 6d | .{\tt n|x}~$\tim|
|00000780| 65 73 24 7e 7b 5c 74 74 | 20 6e 79 7d 20 73 75 62 |es$~{\tt| ny} sub|
|00000790| 70 61 67 65 73 2c 20 77 | 69 74 68 20 7b 5c 74 74 |pages, w|ith {\tt|
|000007a0| 20 6e 78 7d 20 69 6e 20 | 74 68 65 20 68 6f 72 69 | nx} in |the hori|
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|000007c0| 6e 2c 20 61 6e 64 20 7b | 5c 74 74 20 6e 79 7d 20 |n, and {|\tt ny} |
|000007d0| 69 6e 20 74 68 65 20 76 | 65 72 74 69 63 61 6c 20 |in the v|ertical |
|000007e0| 64 69 72 65 63 74 69 6f | 6e 2e 7d 0a 0a 53 75 62 |directio|n.}..Sub|
|000007f0| 70 61 67 65 73 20 61 72 | 65 20 75 73 65 66 75 6c |pages ar|e useful|
|00000800| 20 66 6f 72 20 70 6c 61 | 63 69 6e 67 20 73 65 76 | for pla|cing sev|
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|00000820| 20 70 61 67 65 2c 20 62 | 75 74 20 61 6c 6c 0a 73 | page, b|ut all.s|
|00000830| 75 62 70 61 67 65 73 20 | 61 72 65 20 63 6f 6e 73 |ubpages |are cons|
|00000840| 74 72 61 69 6e 65 64 20 | 74 6f 20 62 65 20 6f 66 |trained |to be of|
|00000850| 20 74 68 65 20 73 61 6d | 65 20 73 69 7a 65 2e 20 | the sam|e size. |
|00000860| 46 6f 72 20 67 72 65 61 | 74 65 72 20 66 6c 65 78 |For grea|ter flex|
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|00000890| 70 61 67 65 2c 20 72 65 | 61 64 20 70 61 67 65 20 |page, re|ad page |
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|000008b0| 74 7d 20 69 6e 20 53 65 | 63 74 69 6f 6e 20 0a 5c |t} in Se|ction .\|
|000008c0| 72 65 66 7b 76 69 65 77 | 70 6f 72 74 7d 20 77 68 |ref{view|port} wh|
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|000008f0| 6f 6e 7b 44 65 66 69 6e | 69 6e 67 20 70 6c 6f 74 |on{Defin|ing plot|
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|00000970| 73 74 61 72 74 73 20 61 | 20 6e 65 77 20 70 69 63 |starts a| new pic|
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