{"id":95,"date":"2021-10-29T00:13:58","date_gmt":"2021-10-28T16:13:58","guid":{"rendered":"http:\/\/purplepoolobservatory.com\/?p=95"},"modified":"2021-12-03T08:52:18","modified_gmt":"2021-12-03T00:52:18","slug":"python%e7%9f%a2%e9%87%8f%e5%8c%96%e8%bf%90%e7%ae%97%e6%9b%b4%e5%bf%ab%e9%80%9f","status":"publish","type":"post","link":"https:\/\/purplepoolobservatory.com\/?p=95","title":{"rendered":"python\u77e2\u91cf\u5316\u8fd0\u7b97\u66f4\u5feb\u901f"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>#coding=utf-8\nimport core, time, swifter\nimport numpy as np\nfrom geopy.distance import great_circle\n\ncata=core.read_cata('cata202110.zmap',cata_type='zmap')\n####################################################\ntime1=time.time()\nd=cata.apply(lambda x:great_circle((30,102),(x&#91;'evla'],x&#91;'evlo'])).km,axis=1)\ntime2=time.time()\nprint('pandas apply time: ',time2-time1)\n\n####################################################\n#time3=time.time()\n#d=cata.swifter.apply(lambda x:great_circle((30,102),(x&#91;'evla'],x&#91;'evlo'])).km,axis=1)\n#time4=time.time()\n#print('swifter apply time: ',time4-time3)\n\n####################################################\narr=np.array(cata&#91;&#91;'evla','evlo']])\ntime5=time.time()\nd=np.apply_along_axis(lambda x:great_circle((30,102),(x&#91;0],x&#91;1])),axis=1,arr=arr)\ntime6=time.time()\nprint('numpy apply time: ',time6-time5)\n\n###################################################\ndef myfunc(a,b,c,d):\n    return great_circle((a,b),(c,d)).km\n\nvfunc=np.vectorize(myfunc)\ntime7=time.time()\nd=vfunc(arr&#91;:,0],arr&#91;:,1],30,102)\ntime8=time.time()\nprint('numpy vectorize time: ',time8-time7)\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":""},"categories":[2],"tags":[6,7],"class_list":["post-95","post","type-post","status-publish","format-gallery","hentry","category-technology","tag-linux","tag-python","post_format-post-format-gallery"],"_links":{"self":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts\/95","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=95"}],"version-history":[{"count":1,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts\/95\/revisions"}],"predecessor-version":[{"id":96,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=\/wp\/v2\/posts\/95\/revisions\/96"}],"wp:attachment":[{"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=95"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=95"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/purplepoolobservatory.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=95"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}