<html><head><meta http-equiv="Content-Type" content="text/html charset=big5"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">To whom will concern it,<div class=""><br class=""></div><div class="">I successfully installed the python-binding with the DiFX-trunk version.</div><div class=""><div class="">For a successful example: </div><div class="">lupin@GLTCU:/data2/lupin$ m5subband.py</div><div class=""><br class=""></div><div class="">m5subband.py ver. 1.2 Jan Wagner 20160228</div><div class=""><br class=""></div><div class="">Extracts a narrow subband via filtering raw VLBI data.</div><div class="">Reads formats supported by the mark5access library.</div><div class=""><br class=""></div><div class="">Usage : m5subband.py <infile> <dataformat> <outfile></div><div class=""> <if_nr> <quality factor></div><div class=""> <start_MHz> <stop_MHz> [<offset>]</div><div class=""><br class=""></div><div class=""> <dataformat> should be of the form: <FORMAT>-<Mbps>-<nchan>-<nbit>, e.g.:</div><div class=""> VLBA1_2-256-8-2</div><div class=""> MKIV1_4-128-2-1</div><div class=""> Mark5B-512-16-2</div><div class=""> VDIF_1000-64-1-2 (here 1000 is payload size in bytes)</div><div class=""><br class=""></div><div class=""> <outfile> output file for 32-bit float subband data (VDIF format)</div><div class=""> <if_nr> the baseband channel to select for filtering (1...<nchan>)</div><div class=""> <factor> any quality factor >=1, with larger factors giving</div><div class=""> progressively steeper filter cutoffs i.e. less leakage</div><div class=""> <start_MHz> starting frequency of desired output band</div><div class=""> <stop_MHz> stop frequency of desired output band</div><div class=""><br class=""></div><div class=""> <offset> is the optional byte offset into the file</div><div class=""><br class=""></div><div class="">—————————————————————————————————</div><div class="">However, when I tried to examine a real case, it shows a error message.</div></div><div class=""><br class=""></div><div class=""><div class="">lupin@GLTCU:/data2/lupin$ time m5subband.py Cm.vdif VDIF_8192-8192-1-2 test2.vdif 1 1 1008 1040 0</div><div class=""><div class="">(Cm.vdif is a vdif file with the bandwidth of 2048 MHz.</div><div class="">m5subband.py, which contributed by Jan Wanger is put under /difx/virtualtrunk/libraries/mark5access/python/examples)</div></div><div class=""><br class=""></div><div class="">Traceback (most recent call last):</div><div class=""> File "/usr/local/src/difx/virtualtrunk/libraries/mark5access/python/examples/m5subband.py", line 256, in <module></div><div class=""> sys.exit(main())</div><div class=""> File "/usr/local/src/difx/virtualtrunk/libraries/mark5access/python/examples/m5subband.py", line 251, in main</div><div class=""> rc = m5subband(argv[1],argv[2],argv[3], if_nr, factor,start_MHz,stop_MHz, offset)</div><div class=""> File "/usr/local/src/difx/virtualtrunk/libraries/mark5access/python/examples/m5subband.py", line 75, in m5subband</div><div class=""> start_bin = int(Ldft_in*start_MHz/bw_in)</div><div class=""><font color="#ff2600" class="">ZeroDivisionError: float division by zero</font></div><div class=""><font color="#ff2600" class=""><br class=""></font></div><div class=""><font color="#ff2600" class=""><span style="color: rgb(4, 51, 255);" class="">The problem might be due to that “bw_in” derived inside the code is 0.</span></font></div><div class=""><br class=""></div><div class="">Sincerely,</div></div><div class="">
<div class=""><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">--</span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">Lupin Chun-Che Lin</span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">Supporting Scientist of GLT (GreenLand Telescope) project </span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">in Institute of Astronomy and Astrophysics, Academia Sinica,</span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">14F of Astronomy-Mathematics Building (Rm: 1405), </span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">National Taiwan University. </span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan.</span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">Tel: +886-2-2366-5464</span></div><div style="font-family: 新細明體, sans-serif; font-size: 14px;" class=""><span style="font-size: 12px;" class="">Fax: +886-2-2367-7849</span></div></div><div class=""><br class=""></div><br class="Apple-interchange-newline">
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