matlab - CSVIMPORT function not working for huge CSV? -


so i'm using this csvimport function, , i'm trying import csv file looks this: 

    2014-6-06 08:03:19, 439105, 1053224, front entrance     2014-6-06 09:43:21, 439105, 1696241, main exit     2014-6-06 10:01:54, 1836139, 1593258, archway     2014-6-06 11:34:26, 845646, external, exit      2014-6-06 04:45:13, 1464748, 439105, side exit

and on 948739 lines. basically, columns 2 , 3 represent peoples' id numbers, , describes calls made 1 person @ event(ex. 439105 calls 1053224). whenever calls outside of event, id shows "external".

i need import columns 2 , 3(ex. 439105 & 1053224). problem can code work on small csv file size , not big one... , according this question, csv file on million lines worked.

according documentation:

[c1 c2 c3] = csvimport( filename, 'columns', {'c1', 'c2', c3'}, ... ) form returns data columns in output variables c1, c2 , c3 respectively, column names case-sensitive , must match column name in file exactly. when fetching data in column mode number of output columns must match number of columns read or must one. in latter case data columns returned single cell matrix.

[c1 c2 c3] = csvimport( filename, 'columns', [1, 3, 4], ,'noheader', true, ... ) form returns data columns in output variables c1, c2 , c3 respectively, columns parameter must contain column indices when 'noheader' option set true.

so used this: 

[c2 c3] = csvimport('hugecsv.csv','columns',2:3,'noheader',true)

using smaller test csv file, printed out this: 

    c2 =    439105   439105   439105   439105  1836139  1464748  1464748    c3 =   '1053224' '1696241' '580064' '1464748' 'external' '439105' '1053224'

which want. however, when actual file of 948739 lines, list of numbers, looks this: 

  439105   439105   439105   439105  1836139  1464748  1464748  1464748  1464748   580064   580064   580064   580064  1053224

and goes on quite while...

so doing wrong when calling csvimport? can't figure out... appreciated, thank you!!!


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i
Read more