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| 2 | <head>
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| 3 | <title>Batch processing tutorial</title>
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| 4 | <style type="text/css" media="all">
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| 5 | div.shell {
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| 6 | background-color: #dbfff9;
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| 7 | padding: 0.1em;
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| 8 | }
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| 9 | div.code {
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| 10 | background-color: #c9ffbf;
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| 11 | padding: 0.1em;
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| 12 | }
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| 13 | div.main {
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| 14 | margin: 0.2em 0.2em 0.2em 0.2em;
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| 15 | text-align: left;
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| 16 | font-family: sans-serif;
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| 17 | width: auto;
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| 18 | }
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| 19 | h1.custom {
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| 20 | background-color: #aaaaaa;
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| 21 | color: #000000;
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| 22 | padding: 0.5em;
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| 23 | font-family: sans-serif;
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| 24 | font-size: x-large;
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| 25 | }
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| 26 | </style>
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| 27 | </head>
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| 28 | <body>
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| 29 | <div>
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| 30 | <h1 class=custom>
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| 31 | Introduction
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| 32 | </h1>
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| 33 | <div class=main align=center>
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| 34 | This tutorial is aimed at observers who want to "batch reduce" their
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| 35 | data, i.e. process multiple files the same way.
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| 36 | </div>
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| 37 | <h1 class=custom>
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| 38 | Part I - Need to knows
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| 39 | </h1>
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| 40 | <div class=main align=center>
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| 41 | As ASAP is python based, we need to know a few commands and expression.
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| 42 | Python has "lists", which are basically vectors. We will use
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| 43 | these extensively.<br>
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| 44 | <div class=code><pre>
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| 45 | x = range(5) # creates a vector of length 5, x = [0,1,2,3,4]
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| 46 | len(x) # gives the length of the vector
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| 47 | x[0] # gets the first element of the vector
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| 48 | x[-1] # gets the last element of the vector
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| 49 | </pre></div>
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| 50 | "for" loops are very useful. The code which should be run in the loop
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| 51 | has to be indented. The end of the loop is indicated by the fact that
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| 52 | the next command is aligned with the for.<br>
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| 53 | The following code prints out the numbers [0..4]
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| 54 | <div class=code><pre>
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| 55 | for i in range(5):
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| 56 | print i
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| 57 | </pre></div>
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| 58 | Vectors can also be filled:
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| 59 | <div class=code><pre>
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| 60 | x = [] # empty
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| 61 | for i in range(5):
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| 62 | x.append(i*5)
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| 63 | </pre></div>
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| 64 | The output is x = [0,5,10,15,20]<br>
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| 65 | Now we can access those elements like we did above (by index), or directly:
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| 66 | <div class=code><pre>
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| 67 | for i in x:
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| 68 | print i
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| 69 | </pre></div>
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| 70 | That's all we need to know!
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| 71 |
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| 72 | </div>
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| 73 | <h1 class=custom>
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| 74 | Part II - the code
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| 75 | </h1>
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| 76 | <div class=main align=center>
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| 77 | This shows example code to process multiple files.<p>
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| 78 | Let's say we have three files (a.rpf, b.rpf, c.rpf) which contain
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| 79 | on/off pairs and we want to get the quotients<br>
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| 80 | <div class=code><pre>
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| 81 | fnames = ["a.rpf","b.rpf","c.rpf"] # First we set up a vector of filenames
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| 82 | vec = [] # a vector to hold the scantables
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| 83 | for f in fnames:
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| 84 | vec.append(scantable(f)) # fill the vector with scantables
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| 85 | </pre></div>
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| 86 | Then we can loop over all scantables:
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| 87 | <div class=code><pre>
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| 88 | quotients = [] # to hold the quotient scantables
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| 89 | for scan in vec: # loop over input scantables
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| 90 | on = scan.get_source("*_S")
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| 91 | off = scan.get_source("*_R")
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| 92 | quotients.append(quotient(on,off)) # add this quotient to the vector
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| 93 | </pre></div>
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| 94 | Let's have a look at the vector, and subtract a baseline
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| 95 | <div class=code><pre>
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| 96 | for q in quotients:
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| 97 | print q
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| 98 | q.auto_poly_baseline(order=1,insitu=True)
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| 99 | </pre></div>
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| 100 | Now we average the lot together:
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| 101 | <div class=code><pre>
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| 102 | av = average_time(quotients)
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| 103 | </pre></div>
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| 104 |
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| 105 | </div>
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| 106 | <h1 class=custom>
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| 107 | Appendix
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| 108 | </h1>
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| 109 | <div class=main align=center>
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| 110 | More info can be found on the ASAP homepage
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| 111 | <a href="http://www.atnf.csiro.au/computing/software/asap">
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| 112 | http://www.atnf.csiro.au/computing/software/asap</a>
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| 113 | </div>
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| 114 | </body>
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| 115 | </html>
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