使用 Octave/Matlab 從 csv 文件中刪除一行
[英]Deleting a row from a csv file with Octave/Matlab
問題描述
我知道這是一個很常見的問題，但我無法找到對我的問題有用的答案。 如果有類似的東西我會刪除這個帖子。
我正在使用 Octave 處理Kaggle 5000 電影數據庫中的電影.csv，我會刪除預算或收入單元格中所有帶零的行。 我在通過文件閱讀列時遇到了一些問題，所以我復制並粘貼了靠近預算列的收入列 - 當然我想知道為什么 Octave 將文本的一部分標識為自治列，但現在不是我最急的麻煩。
更新：矩陣包含數字和字符串值，我會保留預算/收入大於零的行的所有數據。 這里有一個例子，希望它是可以理解的。 我正在處理一個沒有標題的文件，但為了更好的理解，我留下了它。
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
所以這是我的代碼，它打印了一個帶有許多零的新文件，沒有可理解的模式（或者在我看來是這樣）。
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不推薦，但textscan結果內容離別更成問題。 或者，也許我太痴迷於dollars(k)類的東西，我覺得它真的很方便。
2 個解決方案
解決方案1
1 2017-10-07 18:13:14
您的代碼中存在多處錯誤。 請嘗試這個（未經測試的）代碼並進入該行
fprintf(fout, '%s\n', [num2str(budget), ',', num2str(revenue)]);
查看是否從源讀取正確的值並寫入目標。 如果您仍然遇到問題，請更新您的問題。
fid = fopen('original_filepath', 'r');
fout = fopen('new_filepath', 'w+');
while ~feof(fid) #here at first I used ischar but
#it returned an invalid stream number for the ending tline
tline = fgetl(fid); % read current line
dollars = strread(tline, '%f', 'delimiter', ',');
budget = dollars(1);
revenue = dollars(2);
if ~(budget*revenue == 0) % ensure neither budget nor revenue are zero
fprintf(fout, '%s\n', [num2str(budget), ',', num2str(revenue)]);
end
tline = fgetl(fid);
end
fclose(fid);
fclose(fout);
還請考慮使用csvread()而不是 strread，因為您的數據似乎是 csv 格式。
解決方案2
0 已采納 2017-10-09 14:31:50
使用八度鍛造 io 包：
pkg load io
c = csv2cell ("prn.csv");
header = c(1, :);
c(1, :) = []; % strip header
% get column ids
budget_col = find (strcmp (header, "budget"))
revenue_col = find (strcmp (header, "revenue"))
budget = cell2mat (c(:, budget_col));
revenue = cell2mat (c(:, revenue_col));
% remove line where budget or revenue are zero
c (budget == 0 | revenue == 0, :) = [];
% show remaining homepage
c (:, 3)
給
ans =
{
[1,1] = http://www.avatarmovie.com/
[2,1] = http://disney.go.com/disneypictures/pirates/
[3,1] = http://www.sonypictures.com/movies/spectre/
[4,1] = http://www.thedarkknightrises.com/
[5,1] = http://movies.disney.com/john-carter
[6,1] = http://www.sonypictures.com/movies/spider-man3/
[7,1] = http://disney.go.com/disneypictures/tangled/
[8,1] = http://marvel.com/movies/movie/193/avengers_age_of_ultron
[9,1] = http://harrypotter.warnerbros.com/harrypotterandthehalf-bloodprince/dvd/index.html
}
MATLAB / Octave - 如何使用包含逗號的數字和字符串解析CSV文件
[英]MATLAB / Octave - how to parse CSV file with numbers and strings that contain commas
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.