Reading Text file comma seperated on Matlab

问题

I'm trying to read a comma separated text file that looks like the following:

2017-10-24,01:17:38,2017-10-24,02:17:38,+1.76,L,Meters
2017-10-24,02:57:31,2017-10-24,03:57:31,+1.92,H,Meters
2017-10-24,05:53:35,2017-10-24,06:53:35,+1.00,L,Meters
2017-10-24,10:45:01,2017-10-24,11:45:01,+2.06,H,Meters
2017-10-24,13:27:16,2017-10-24,14:27:16,+1.78,L,Meters
2017-10-24,15:07:16,2017-10-24,16:07:16,+1.92,H,Meters
2017-10-24,18:12:08,2017-10-24,19:12:08,+0.98,L,Meters

My code so far is:

LT_data = fopen('D:\Beach Erosion and Recovery\Bournemouth\Bournemouth Tidal Data\tidal_data_jtide.txt');% text file containing predicted low tide times

LT_celldata = textscan(LT_data,'%D %D %D %D %d ','delimiter',',')'

回答1:

For mixed data types, I'd recommend readtable. This will read your data straight into a table object without having to specify a format spec or use fopen,

t = readtable( 'myFile.txt', 'ReadVariableNames', false, 'Delimiter', ',' );

Then you can easily manipulate the data

% Variable names in the table
t.Properties.VariableNames = {'Date1', 'Time1', 'Date2', 'Time2', 'Value', 'Dim', 'Units'};

% Create full datetime object columns from the date and time columns
t.DateTime1 = datetime( strcat(t.Date1,t.Time1), 'InputFormat', 'yyyy-MM-ddHH:mm:ss' );

If you do know the formats, you can specify the 'format' property within readtable and it will convert the data when reading.

回答2:

This is working perfectly. The formatspec need to be edited.

file = 'D:\Beach Erosion and Recovery\Bournemouth\Bournemouth Tidal Data\tidal_data_jtide.txt'
fileID = fopen(file);
LT_celldata = textscan(fileID,'%D%D%D%D%d%[^\n\r]','delimiter',',')

来源：https://stackoverflow.com/questions/51441759/reading-text-file-comma-seperated-on-matlab