使用Octave/Matlab從csv文件中刪除一行

Question

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，我會刪除這篇文章。

我正在從Kaggle's 5000 Movies Database的movies.csv上使用Octave，我會刪除預算或收入單元格中所有帶零的行。我在閱讀文件中的列時遇到了一些問題，所以我已經將收入列複製並粘貼到預算列 - 我當然想知道爲什麼八度將文本的部分標識爲自治列，但現在不是我最緊急的麻煩。

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。這裏有一個例子，希望它是可以理解的。我正在處理一個已經沒有標題的文件，但是我爲了更好的理解而離開了它。

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 â€「 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，它打印了許多零的新文件，而不可理解的模式（或者看起來是給我）。

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，也許我太癡迷像dollars(k)，我覺得非常方便。

Answer 1

使用octave-forge io package：

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 
} 

octave

Answer 2

你的代碼有多個錯誤。請試試這個（未經測試）的代碼，並進入行

fprintf(fout, '%s\n', [num2str(budget), ',', num2str(revenue)]); 

，看是否正確的值從源讀取和寫入目的地。如果您遇到問題，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); 

也請考慮使用strread的csvread()而不是爲你的數據似乎是在csv格式。