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annotate rsib.py @ 8:381ed6f3d2d7

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Save handle after using it, makes the code look nicer.
author Daniel O'Connor <darius@dons.net.au>
date Sat, 16 May 2009 23:32:33 +0930
parents 85dfc0babc36
children 55c8dae6d1db
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2009
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4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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5 #
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6 # Redistribution and use in source and binary forms, with or without
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7 # modification, are permitted provided that the following conditions
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8 # are met:
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9 # 1. Redistributions of source code must retain the above copyright
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10 # notice, this list of conditions and the following disclaimer.
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11 # 2. Redistributions in binary form must reproduce the above copyright
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12 # notice, this list of conditions and the following disclaimer in the
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13 # documentation and/or other materials provided with the distribution.
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14 #
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15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 # SUCH DAMAGE.
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26 #
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27
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28 # Reverse engineered from the Linux library & example program at
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29 # http://epsrv.astro.umk.pl/~ep/irbene/rsib/library/RSIB-Linux.zip
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30 #
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31 # There are 2 socket connections for some reason.
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32 # The first seems to do [nearly] all the work
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33 #
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34 # Packets to the instrument
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35 # On connection:
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36 # -> 00 00 00 40
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37 # <- 00 00 00 40 a0 04 00 00
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38 #
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39 # We need to echo back the last 4 bytes of the reply to a second
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40 # socket opened to the same port. I don't know what that socket is for
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41 # though.
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42 #
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43 # Send a command:
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44 # -> 00 00 00 05 90 00 01 2a 49 44 4e 3f .......* IDN?
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45 #
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46 # Offs Value Meaning
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47 # 00 00 ?
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48 # 01 00 ?
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49 # 02 00 ?
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50 # 03 05 Length
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51 # 04 90 MsgID
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52 # 05 00 ?
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53 # 06 03 Seq number
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54 # 07 2a (*) Cmd byte 0
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55 # 08 49 (I) Cmd byte 1
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56 # 09 44 (D) Cmd byte 2
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57 # 10 4a (N) Cmd byte 3
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58 # 10 3f (?) Cmd byte 4
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59 #
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60 # Interactive program seems to cap length at 0x99 but perhaps the
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61 # first 4 bytes are length.
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62 #
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63 # Reply to command:
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64 # <- 00 00 00 23 80 00 01 52 6f 68 ...
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65 #
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66 # Offs Value Meaning
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67 # 00 00 Length 31..24
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68 # 01 00 23..16
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69 # 02 00 15..8
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70 # 03 23 7..0
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71 # 04 80 MsgID
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72 # 05 00 ?
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73 # 06 01 Seq number
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74
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75 MSG_HELLO = 0x40 # We send this on connect
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76 MSG_CMDREP = 0x80 # Reply from the instrument to us
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77 MSG_CMD = 0x90 # Command to the instrument
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78
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79 import socket
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80
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81 class RSIBDevice(object):
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82 hello = '\x00\x00\x00\x40'
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83 docmd = '\x00\x00\x00\x05\x90\x00\x01'
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84
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85 def __init__(self, host, port = 2525):
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86 self.host = host
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87 self.port = port
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88
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89 s1 = socket.socket()
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90 s1.settimeout(5)
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91 s1.connect((self.host, self.port))
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92 s1.send('\x00\x00\x00\x40')
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93 rx = ''
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94 while len(rx) < 8:
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95 rx = rx + s1.recv(8)
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96 if rx == '':
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97 raise "EOF from device"
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98
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99 s2 = socket.socket()
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100 s2.settimeout(5)
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101 s2.connect((self.host, self.port))
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102 s2.send(rx[4:])
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103
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104 self.s1 = s1
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105 self.s2 = s2
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106 self.tag = 0
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107
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108 def write(self, cmd, timeout = 0.5):
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109 """Send data (string) to the instrument"""
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110 self.s1.settimeout(timeout)
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111
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112 if len(cmd) > 0x99:
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113 raise "Command too long"
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114
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115 # Pre-increment for easy comparison in read
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116 self.tag = (self.tag + 1) & 0xff
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117 msg = '\x00\x00\x00' + chr(len(cmd)) + '\x90\x00' + chr(self.tag) + cmd
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118 self.s1.send(msg)
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119
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120 def read(self, timeout = 0.5):
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121 """Read data from the device, waits for up to timeout seconds for each TCP read"""
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122
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123 self.s1.settimeout(timeout)
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124
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125 # Fetch the header
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126 rx = ''
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127 while len(rx) < 7:
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128 rx = self.s1.recv(7)
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129 if rx == '':
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130 raise "EOF from device"
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131
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132 if self.tag != ord(rx[6]):
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133 raise "Reply out of order, got 0x%02x expected 0x%02x" % (ord(rx[6]), self.tag)
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134
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135 rxlen = ord(rx[0]) << 24 | ord(rx[1]) << 16 | ord(rx[2]) << 8 | ord(rx[3])
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136 if ord(rx[5]) != 0:
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137 print "Mystery byte %d != 0" % (ord(rx[5]))
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138
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139 # Fetch the actual reply now we know the length
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140 reply = ''
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141 while len(reply) < rxlen:
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142 rx = self.s1.recv(rxlen)
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143 if rx == '':
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144 raise "EOF from device"
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145 reply += rx
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146
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147 return(reply)
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148
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149
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150 def test(r):
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151 import numpy
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152 from matplotlib import pylab
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153
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154 r.write('*IDN?')
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155 print "ID is " + r.read(5)
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156 r.write("*RST")
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157 r.write("INIT:CONT OFF")
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158 r.write("SYST:DISP:UPD ON")
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159 r.write("FREQ:STAR 85MHz;STOP 125MHz")
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160 r.write("DISP:WIND:TRAC:T:RLEV -20dBm")
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161 r.write("INIT;*WAI")
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162 r.write("*OPC?")
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163 print "OPC - " + r.read(10)
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164 r.write("CALC:MARK:PEXC 6DB")
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165 r.write("CALC:MARK:FUNC:TOI ON")
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166 r.write("CALC:MARK:FUNC:TOI:RES?")
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167 print "Result " + r.read(10)
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168
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169 r.write("FORM:DAYA ASC")
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170 r.write("CALC:LIM5:NAME 'TEST1'")
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171 r.write("CALC:LIM5:COMM 'Upper limit line'")
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172 r.write("CALC1:LIM5:TRAC 2")
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173 r.write("TRAC1? TRACE1")
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174 data = r.read(10)
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175 #print "Data - " + dat
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176 data = map(float, data.split(','))
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177 ary = numpy.array(data)
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178 pylab.plot(ary)
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179 pylab.show()
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180
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181