【发布时间】：2017-10-07 16:43:18
【问题描述】：
我知道这是一个很常见的问题，但我找不到对我的问题有用的答案。如果有类似的我会删除这个帖子。
我正在使用 Octave 处理来自 Kaggle's 5000 Movies Database 的 movies.csv，我将删除预算或收入单元格中所有带零的行。我在通过文件读取列时遇到了一些问题，所以我复制并粘贴了接近预算的收入列 - 我当然想知道为什么 Octave 将文本的一部分识别为自治列，但现在不是我最紧迫的问题。
更新：矩阵包含数字和字符串值，我会保留预算/收入大于零的行的所有数据。这里有一个示例，希望它可以理解。我正在处理一个已经没有标题的文件，但为了更好地理解，我把它留了下来。
budget,genres,homepage,id,keywords,original_language,original_title,overview,popularity,production_companies,production_countries,release_date,revenue,runtime,spoken_languages,status,tagline,title,vote_average,vote_count
237000000,"[{""id"": 28, ""name"": ""Action""}, {""id"": 12, ""name"": ""Adventure""}, {""id"": 14, ""name"": ""Fantasy""}, {""id"": 878, ""name"": ""Science Fiction""}]",http://www.avatarmovie.com/,19995,"[{""id"": 1463, ""name"": ""culture clash""}, {""id"": 2964, ""name"": ""future""}, {""id"": 3386, ""name"": ""space war""}, {""id"": 3388, ""name"": ""space colony""}, {""id"": 3679, ""name"": ""society""}, {""id"": 3801, ""name"": ""space travel""}, {""id"": 9685, ""name"": ""futuristic""}, {""id"": 9840, ""name"": ""romance""}, {""id"": 9882, ""name"": ""space""}, {""id"": 9951, ""name"": ""alien""}, {""id"": 10148, ""name"": ""tribe""}, {""id"": 10158, ""name"": ""alien planet""}, {""id"": 10987, ""name"": ""cgi""}, {""id"": 11399, ""name"": ""marine""}, {""id"": 13065, ""name"": ""soldier""}, {""id"": 14643, ""name"": ""battle""}, {""id"": 14720, ""name"": ""love affair""}, {""id"": 165431, ""name"": ""anti war""}, {""id"": 193554, ""name"": ""power relations""}, {""id"": 206690, ""name"": ""mind and soul""}, {""id"": 209714, ""name"": ""3d""}]",en,Avatar,"In the 22nd century, a paraplegic Marine is dispatched to the moon Pandora on a unique mission, but becomes torn between following orders and protecting an alien civilization.",150.437577,"[{""name"": ""Ingenious Film Partners"", ""id"": 289}, {""name"": ""Twentieth Century Fox Film Corporation"", ""id"": 306}, {""name"": ""Dune Entertainment"", ""id"": 444}, {""name"": ""Lightstorm Entertainment"", ""id"": 574}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}, {""iso_3166_1"": ""GB"", ""name"": ""United Kingdom""}]",2009-12-10,2787965087,162,"[{""iso_639_1"": ""en"", ""name"": ""English""}, {""iso_639_1"": ""es"", ""name"": ""Espa\u00f1ol""}]",Released,Enter the World of Pandora.,Avatar,7.2,11800
300000000,"[{""id"": 12, ""name"": ""Adventure""}, {""id"": 14, ""name"": ""Fantasy""}, {""id"": 28, ""name"": ""Action""}]",http://disney.go.com/disneypictures/pirates/,285,"[{""id"": 270, ""name"": ""ocean""}, {""id"": 726, ""name"": ""drug abuse""}, {""id"": 911, ""name"": ""exotic island""}, {""id"": 1319, ""name"": ""east india trading company""}, {""id"": 2038, ""name"": ""love of one's life""}, {""id"": 2052, ""name"": ""traitor""}, {""id"": 2580, ""name"": ""shipwreck""}, {""id"": 2660, ""name"": ""strong woman""}, {""id"": 3799, ""name"": ""ship""}, {""id"": 5740, ""name"": ""alliance""}, {""id"": 5941, ""name"": ""calypso""}, {""id"": 6155, ""name"": ""afterlife""}, {""id"": 6211, ""name"": ""fighter""}, {""id"": 12988, ""name"": ""pirate""}, {""id"": 157186, ""name"": ""swashbuckler""}, {""id"": 179430, ""name"": ""aftercreditsstinger""}]",en,Pirates of the Caribbean: At World's End,"Captain Barbossa, long believed to be dead, has come back to life and is headed to the edge of the Earth with Will Turner and Elizabeth Swann. But nothing is quite as it seems.",139.082615,"[{""name"": ""Walt Disney Pictures"", ""id"": 2}, {""name"": ""Jerry Bruckheimer Films"", ""id"": 130}, {""name"": ""Second Mate Productions"", ""id"": 19936}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2007-05-19,961000000,169,"[{""iso_639_1"": ""en"", ""name"": ""English""}]",Released,"At the end of the world, the adventure begins.",Pirates of the Caribbean: At World's End,6.9,4500
245000000,"[{""id"": 28, ""name"": ""Action""}, {""id"": 12, ""name"": ""Adventure""}, {""id"": 80, ""name"": ""Crime""}]",http://www.sonypictures.com/movies/spectre/,206647,"[{""id"": 470, ""name"": ""spy""}, {""id"": 818, ""name"": ""based on novel""}, {""id"": 4289, ""name"": ""secret agent""}, {""id"": 9663, ""name"": ""sequel""}, {""id"": 14555, ""name"": ""mi6""}, {""id"": 156095, ""name"": ""british secret service""}, {""id"": 158431, ""name"": ""united kingdom""}]",en,Spectre,"A cryptic message from Bond’s past sends him on a trail to uncover a sinister organization. While M battles political forces to keep the secret service alive, Bond peels back the layers of deceit to reveal the terrible truth behind SPECTRE.",107.376788,"[{""name"": ""Columbia Pictures"", ""id"": 5}, {""name"": ""Danjaq"", ""id"": 10761}, {""name"": ""B24"", ""id"": 69434}]","[{""iso_3166_1"": ""GB"", ""name"": ""United Kingdom""}, {""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2015-10-26,880674609,148,"[{""iso_639_1"": ""fr"", ""name"": ""Fran\u00e7ais""}, {""iso_639_1"": ""en"", ""name"": ""English""}, {""iso_639_1"": ""es"", ""name"": ""Espa\u00f1ol""}, {""iso_639_1"": ""it"", ""name"": ""Italiano""}, {""iso_639_1"": ""de"", ""name"": ""Deutsch""}]",Released,A Plan No One Escapes,Spectre,6.3,4466
250000000,"[{""id"": 28, ""name"": ""Action""}, {""id"": 80, ""name"": ""Crime""}, {""id"": 18, ""name"": ""Drama""}, {""id"": 53, ""name"": ""Thriller""}]",http://www.thedarkknightrises.com/,49026,"[{""id"": 849, ""name"": ""dc comics""}, {""id"": 853, ""name"": ""crime fighter""}, {""id"": 949, ""name"": ""terrorist""}, {""id"": 1308, ""name"": ""secret identity""}, {""id"": 1437, ""name"": ""burglar""}, {""id"": 3051, ""name"": ""hostage drama""}, {""id"": 3562, ""name"": ""time bomb""}, {""id"": 6969, ""name"": ""gotham city""}, {""id"": 7002, ""name"": ""vigilante""}, {""id"": 9665, ""name"": ""cover-up""}, {""id"": 9715, ""name"": ""superhero""}, {""id"": 9990, ""name"": ""villainess""}, {""id"": 10044, ""name"": ""tragic hero""}, {""id"": 13015, ""name"": ""terrorism""}, {""id"": 14796, ""name"": ""destruction""}, {""id"": 18933, ""name"": ""catwoman""}, {""id"": 156082, ""name"": ""cat burglar""}, {""id"": 156395, ""name"": ""imax""}, {""id"": 173272, ""name"": ""flood""}, {""id"": 179093, ""name"": ""criminal underworld""}, {""id"": 230775, ""name"": ""batman""}]",en,The Dark Knight Rises,"Following the death of District Attorney Harvey Dent, Batman assumes responsibility for Dent's crimes to protect the late attorney's reputation and is subsequently hunted by the Gotham City Police Department. Eight years later, Batman encounters the mysterious Selina Kyle and the villainous Bane, a new terrorist leader who overwhelms Gotham's finest. The Dark Knight resurfaces to protect a city that has branded him an enemy.",112.31295,"[{""name"": ""Legendary Pictures"", ""id"": 923}, {""name"": ""Warner Bros."", ""id"": 6194}, {""name"": ""DC Entertainment"", ""id"": 9993}, {""name"": ""Syncopy"", ""id"": 9996}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2012-07-16,1084939099,165,"[{""iso_639_1"": ""en"", ""name"": ""English""}]",Released,The Legend Ends,The Dark Knight Rises,7.6,9106
260000000,"[{""id"": 28, ""name"": ""Action""}, {""id"": 12, ""name"": ""Adventure""}, {""id"": 878, ""name"": ""Science Fiction""}]",http://movies.disney.com/john-carter,49529,"[{""id"": 818, ""name"": ""based on novel""}, {""id"": 839, ""name"": ""mars""}, {""id"": 1456, ""name"": ""medallion""}, {""id"": 3801, ""name"": ""space travel""}, {""id"": 7376, ""name"": ""princess""}, {""id"": 9951, ""name"": ""alien""}, {""id"": 10028, ""name"": ""steampunk""}, {""id"": 10539, ""name"": ""martian""}, {""id"": 10685, ""name"": ""escape""}, {""id"": 161511, ""name"": ""edgar rice burroughs""}, {""id"": 163252, ""name"": ""alien race""}, {""id"": 179102, ""name"": ""superhuman strength""}, {""id"": 190320, ""name"": ""mars civilization""}, {""id"": 195446, ""name"": ""sword and planet""}, {""id"": 207928, ""name"": ""19th century""}, {""id"": 209714, ""name"": ""3d""}]",en,John Carter,"John Carter is a war-weary, former military captain who's inexplicably transported to the mysterious and exotic planet of Barsoom (Mars) and reluctantly becomes embroiled in an epic conflict. It's a world on the brink of collapse, and Carter rediscovers his humanity when he realizes the survival of Barsoom and its people rests in his hands.",43.926995,"[{""name"": ""Walt Disney Pictures"", ""id"": 2}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2012-03-07,284139100,132,"[{""iso_639_1"": ""en"", ""name"": ""English""}]",Released,"Lost in our world, found in another.",John Carter,6.1,2124
258000000,"[{""id"": 14, ""name"": ""Fantasy""}, {""id"": 28, ""name"": ""Action""}, {""id"": 12, ""name"": ""Adventure""}]",http://www.sonypictures.com/movies/spider-man3/,559,"[{""id"": 851, ""name"": ""dual identity""}, {""id"": 1453, ""name"": ""amnesia""}, {""id"": 1965, ""name"": ""sandstorm""}, {""id"": 2038, ""name"": ""love of one's life""}, {""id"": 3446, ""name"": ""forgiveness""}, {""id"": 3986, ""name"": ""spider""}, {""id"": 4391, ""name"": ""wretch""}, {""id"": 4959, ""name"": ""death of a friend""}, {""id"": 5776, ""name"": ""egomania""}, {""id"": 5789, ""name"": ""sand""}, {""id"": 5857, ""name"": ""narcism""}, {""id"": 6062, ""name"": ""hostility""}, {""id"": 8828, ""name"": ""marvel comic""}, {""id"": 9663, ""name"": ""sequel""}, {""id"": 9715, ""name"": ""superhero""}, {""id"": 9748, ""name"": ""revenge""}]",en,Spider-Man 3,"The seemingly invincible Spider-Man goes up against an all-new crop of villain – including the shape-shifting Sandman. While Spider-Man’s superpowers are altered by an alien organism, his alter ego, Peter Parker, deals with nemesis Eddie Brock and also gets caught up in a love triangle.",115.699814,"[{""name"": ""Columbia Pictures"", ""id"": 5}, {""name"": ""Laura Ziskin Productions"", ""id"": 326}, {""name"": ""Marvel Enterprises"", ""id"": 19551}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2007-05-01,890871626,139,"[{""iso_639_1"": ""en"", ""name"": ""English""}, {""iso_639_1"": ""fr"", ""name"": ""Fran\u00e7ais""}]",Released,The battle within.,Spider-Man 3,5.9,3576
260000000,"[{""id"": 16, ""name"": ""Animation""}, {""id"": 10751, ""name"": ""Family""}]",http://disney.go.com/disneypictures/tangled/,38757,"[{""id"": 1562, ""name"": ""hostage""}, {""id"": 2343, ""name"": ""magic""}, {""id"": 2673, ""name"": ""horse""}, {""id"": 3205, ""name"": ""fairy tale""}, {""id"": 4344, ""name"": ""musical""}, {""id"": 7376, ""name"": ""princess""}, {""id"": 10336, ""name"": ""animation""}, {""id"": 33787, ""name"": ""tower""}, {""id"": 155658, ""name"": ""blonde woman""}, {""id"": 162219, ""name"": ""selfishness""}, {""id"": 163545, ""name"": ""healing power""}, {""id"": 179411, ""name"": ""based on fairy tale""}, {""id"": 179431, ""name"": ""duringcreditsstinger""}, {""id"": 215258, ""name"": ""healing gift""}, {""id"": 234183, ""name"": ""animal sidekick""}]",en,Tangled,"When the kingdom's most wanted-and most charming-bandit Flynn Rider hides out in a mysterious tower, he's taken hostage by Rapunzel, a beautiful and feisty tower-bound teen with 70 feet of magical, golden hair. Flynn's curious captor, who's looking for her ticket out of the tower where she's been locked away for years, strikes a deal with the handsome thief and the unlikely duo sets off on an action-packed escapade, complete with a super-cop horse, an over-protective chameleon and a gruff gang of pub thugs.",48.681969,"[{""name"": ""Walt Disney Pictures"", ""id"": 2}, {""name"": ""Walt Disney Animation Studios"", ""id"": 6125}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2010-11-24,591794936,100,"[{""iso_639_1"": ""en"", ""name"": ""English""}]",Released,They're taking adventure to new lengths.,Tangled,7.4,3330
280000000,"[{""id"": 28, ""name"": ""Action""}, {""id"": 12, ""name"": ""Adventure""}, {""id"": 878, ""name"": ""Science Fiction""}]",http://marvel.com/movies/movie/193/avengers_age_of_ultron,99861,"[{""id"": 8828, ""name"": ""marvel comic""}, {""id"": 9663, ""name"": ""sequel""}, {""id"": 9715, ""name"": ""superhero""}, {""id"": 9717, ""name"": ""based on comic book""}, {""id"": 10629, ""name"": ""vision""}, {""id"": 155030, ""name"": ""superhero team""}, {""id"": 179431, ""name"": ""duringcreditsstinger""}, {""id"": 180547, ""name"": ""marvel cinematic universe""}, {""id"": 209714, ""name"": ""3d""}]",en,Avengers: Age of Ultron,"When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth’s Mightiest Heroes are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.",134.279229,"[{""name"": ""Marvel Studios"", ""id"": 420}, {""name"": ""Prime Focus"", ""id"": 15357}, {""name"": ""Revolution Sun Studios"", ""id"": 76043}]","[{""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2015-04-22,1405403694,141,"[{""iso_639_1"": ""en"", ""name"": ""English""}]",Released,A New Age Has Come.,Avengers: Age of Ultron,7.3,6767
250000000,"[{""id"": 12, ""name"": ""Adventure""}, {""id"": 14, ""name"": ""Fantasy""}, {""id"": 10751, ""name"": ""Family""}]",http://harrypotter.warnerbros.com/harrypotterandthehalf-bloodprince/dvd/index.html,767,"[{""id"": 616, ""name"": ""witch""}, {""id"": 2343, ""name"": ""magic""}, {""id"": 3872, ""name"": ""broom""}, {""id"": 3884, ""name"": ""school of witchcraft""}, {""id"": 6333, ""name"": ""wizardry""}, {""id"": 10164, ""name"": ""apparition""}, {""id"": 10791, ""name"": ""teenage crush""}, {""id"": 12564, ""name"": ""werewolf""}]",en,Harry Potter and the Half-Blood Prince,"As Harry begins his sixth year at Hogwarts, he discovers an old book marked as 'Property of the Half-Blood Prince', and begins to learn more about Lord Voldemort's dark past.",98.885637,"[{""name"": ""Warner Bros."", ""id"": 6194}, {""name"": ""Heyday Films"", ""id"": 7364}]","[{""iso_3166_1"": ""GB"", ""name"": ""United Kingdom""}, {""iso_3166_1"": ""US"", ""name"": ""United States of America""}]",2009-07-07,933959197,153,"[{""iso_639_1"": ""en"", ""name"": ""English""}]",Released,Dark Secrets Revealed,Harry Potter and the Half-Blood Prince,7.4,5293
这就是我的代码，它打印了一个带有许多零的新文件，没有可理解的模式（或者在我看来是这样）。
fid = fopen('original_filepath', 'r');
fout = fopen('new_filepath', 'w+');
tline = fgetl(fid);
while ~feof(fid) #here at first I used ischar but
#it returned an invalid stream number for the ending tline
dollars = strread(tline, '%f', 'delimiter', ',');
budget = dollars(1);
revenue = dollars(2);
if budget = 0 || revenue = 0
fprintf(fout, '%s\n', tline);
end
tline = fgetl(fid);
end
fclose(fid);
fclose(fout);
我知道strread不推荐，但是textscan导致内容分割问题更大。或者也许我太着迷于拥有像 dollars(k) 这样的东西，我觉得它真的很方便。
【问题讨论】：
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由于有人需要注册才能下载 CSV，因此不太可能有人会在这里提供帮助。你为什么不使用 csvread 或 dlmread？ IO package 中也有很多导入函数。如果您希望有人积极帮助您，您应该创建一个小的输入 CSV，其中包含几行来显示您的问题。另见minimal reproducible example
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感谢您的回答。可以看到数据库的预览，所以我认为在 Kaggle 网站上查看更简单。我会更新我的问题。我不知道（也没有找到任何关于）dlmread，我会查看文档。
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CSV 的屏幕截图不是最佳选择，因为它不允许编写代码来加载它。我看到这个 CSV 包含 JSON 数据，所以您也有兴趣使用 jsonlab 或 rapidjson-octave 解码这些数据？
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谢谢，根据我使用 Octave 的经验，我不知道它有 JSON 数据的解码器。事实上，在这项工作之前，我只使用没有 JSON 数据的 csv 文件，我最初的意图只涉及矩阵的清理，但是是的，我会非常有兴趣尝试新工具。然而，在我尝试使用这个数据库并得到这篇文章的答案之后，我认为我的主要需要是加深我对 Octave 的理论知识，因为这个非常简单的真实案例比我想象的更成问题。跨度>
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主要问题是，您没有上传 CSV（前 10 行就足够了）。因此，任何可能帮助您的人都会看到这个问题并认为“什么？我必须在某个网站上注册才能在 SO 上帮助某人？不可能”
标签： matlab csv octave rowdeleting