MATLAB: Importing data and plotting

data importtxt file

How can I load this txt file with some text at starting and numericals.I want to plot H,D,Z,F values aginst time see attached file plse

Best Answer

hello
impordata or readtable will do the trick
example with impordata : 
importdata('abg20000212dminn.txt')
ans =
  1466×1 cell array
    {' Format                 IAGA-2002                                    |'}
    {' Source of Data         Indian Institute of Geomagnetism             |'}
    {' Station Name           Alibag                                       |'}
    {' IAGA CODE              ABG                                          |'}
    {' Geodetic Latitude      18.620                                       |'}
    {' Geodetic Longitude     72.870                                       |'}
    {' Elevation              0                                            |'}
    {' Reported               HDZF                                         |'}
    {' Sensor Orientation     HDZF                                         |'}
    {' Digital Sampling       5.0 seconds                                  |'}
    {' Data Interval Type     Average 1-Minute (00:30-01:29)               |'}
    {' Data Type              Definitive                                   |'}
    {' # D-conversion factor  110800                                       |'}
    {' # K9-limit                                                          |'}
    {' # This data file was converted from INTERMAGNET CD-ROM              |'}
    {' # Format binary data.                                               |'}
    {' # A complete set is available on the INTERMAGNET CD-ROM.            |'}
    {' # Go to www.intermagnet.org for details on obtaining this product.  |'}
    {' # CONDITIONS OF USE: These data are for scientific/academic use     |'}
    {' # For any other applications see the 'Conditions of Use' published  |'}
    {' # on the INTERMAGNET web site - www.intermagnet.org                 |'}
    {' # D conversion factor is a fixed value used to allow                |'}
    {' # Declination to be converted from minutes of arc to equivalent     |'}
    {' # nanoteslas. Set to H/3438*10000 where H is the annual mean        |'}
    {' # value of horizontal intensity.                                    |'}
    {'DATE       TIME         DOY     ABGH      ABGD      ABGZ      ABGF   |'}
    {'2000-02-12 00:00:00.000 043     99999.00  99999.00  99999.00  99999.00'}
    {'2000-02-12 00:01:00.000 043     38132.70    -21.20  18442.20  99999.00'}
    {'2000-02-12 00:02:00.000 043     38131.90    -21.20  18443.20  99999.00'}
    {'2000-02-12 00:03:00.000 043     38132.20    -21.10  18443.90  99999.00'}
    {'2000-02-12 00:04:00.000 043     38132.90    -21.10  18444.60  99999.00'}
    {'2000-02-12 00:05:00.000 043     38132.00    -21.00  18445.70  99999.00'}
    {'2000-02-12 00:06:00.000 043     38129.50    -20.80  18447.20  99999.00'}
    {'2000-02-12 00:07:00.000 043     38129.00    -20.80  18448.00  99999.00'}
    {'2000-02-12 00:08:00.000 043     38129.20    -20.80  18448.00  99999.00'}
    .....
    
    example with readtable 
T = readtable(filename,'VariableNamingRule' ,'preserve');
M = table2cell(T)
M =
  1454×12 cell array
  Columns 1 through 6
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[    110800]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[NaT       ]}    {[NaN     ]}    {[NaN]}    {[       NaN]}    {[     NaN]}    {[       NaN]}
    {[2000-02-12]}    {[00:00:00]}    {[ 43]}    {[     99999]}    {[   99999]}    {[     99999]}
    {[2000-02-12]}    {[00:01:00]}    {[ 43]}    {[3.8133e+04]}    {[-21.2000]}    {[1.8442e+04]}
    {[2000-02-12]}    {[00:02:00]}    {[ 43]}    {[3.8132e+04]}    {[-21.2000]}    {[1.8443e+04]}
    {[2000-02-12]}    {[00:03:00]}    {[ 43]}    {[3.8132e+04]}    {[-21.1000]}    {[1.8444e+04]}
    {[2000-02-12]}    {[00:04:00]}    {[ 43]}    {[3.8133e+04]}    {[-21.1000]}    {[1.8445e+04]}
    {[2000-02-12]}    {[00:05:00]}    {[ 43]}    {[     38132]}    {[     -21]}    {[1.8446e+04]}
    ............
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