MATLAB: Delete the header from a scientific data

Question

i want to delete the header of my file which is called cnb20090101psec.sec and i want to do that for 365 files and the header occupy the first 21 lines in every file, and if the files should be in TXT format so how to convert all the 365 files in once ??

<pre> Format                 IAGA-2002                                    |
 Source of Data         INTERMAGNET Edinburgh GIN                    |
 Station Name           Canberra, Australia                          |
 IAGA CODE              CNB                                          |
 Geodetic Latitude      125.300                                      |
 Geodetic Longitude     149.400                                      |
 Elevation                                                           |
 Reported               XYZF                                         |
 Sensor Orientation                                                  |
 Digital Sampling                                                    |
 Data Interval Type     1-second                                     |
 Data Type              provisional                                  |
 # This data file was created using INTERMAGNET data                 |
 # from the Edinburgh GIN. These data were acquired                  |
 # from an INTERMAGNET adjusted data file.                           |
 # Final data will be 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 INTERMANGET web site - www.intermagnet.org                 |
DATE       TIME         DOY     CNBX      CNBY      CNBZ      CNBF   |
2009-01-01 00:00:00.000 001     23167.79   5136.44 -53071.11  58134.95
2009-01-01 00:00:01.000 001     23167.75   5136.47 -53071.11  58134.94
2009-01-01 00:00:02.000 001     23167.66   5136.47 -53071.18  58134.96
2009-01-01 00:00:03.000 001     23167.75   5136.47 -53071.11  58134.94
2009-01-01 00:00:04.000 001     23167.72   5136.46 -53071.11  58134.92
2009-01-01 00:00:05.000 001     23167.68   5136.46 -53071.11  58134.91
2009-01-01 00:00:06.000 001     23167.67   5136.49 -53071.11  58134.91
2009-01-01 00:00:07.000 001     23167.61   5136.48 -53071.13  58134.90
2009-01-01 00:00:08.000 001     23167.64   5136.48 -53071.08  58134.86
2009-01-01 00:00:09.000 001     23167.64   5136.48 -53071.11  58134.89
2009-01-01 00:00:10.000 001     23167.61   5136.44 -53071.11  58134.88
2009-01-01 00:00:11.000 001     23167.57   5136.47 -53071.16  58134.91
2009-01-01 00:00:12.000 001     23167.65   5136.45 -53071.13  58134.91
2009-01-01 00:00:13.000 001     23167.61   5136.48 -53071.11  58134.88
2009-01-01 00:00:14.000 001     23167.63   5136.46 -53071.11  58134.89
2009-01-01 00:00:15.000 001     23167.65   5136.45 -53071.11  58134.89
2009-01-01 00:00:16.000 001     23167.57   5136.47 -53071.18  58134.93
2009-01-01 00:00:17.000 001     23167.68   5136.46 -53071.11  58134.91
2009-01-01 00:00:18.000 001     23167.68   5136.46 -53071.11  58134.91
2009-01-01 00:00:19.000 001     23167.68   5136.46 -53071.08  58134.88
2009-01-01 00:00:20.000 001     23167.70   5136.44 -53071.11  58134.91
2009-01-01 00:00:21.000 001     23167.68   5136.46 -53071.13  58134.92
2009-01-01 00:00:22.000 001     23167.70   5136.44 -53071.08  58134.89
2009-01-01 00:00:23.000 001     23167.74   5136.41 -53071.11  58134.93
2009-01-01 00:00:24.000 001     23167.74   5136.45 -53071.11  58134.93
2009-01-01 00:00:25.000 001     23167.70   5136.44 -53071.13  58134.93
2009-01-01 00:00:26.000 001     23167.71   5136.41 -53071.08  58134.89
2009-01-01 00:00:27.000 001     23167.74   5136.41 -53071.11  58134.93
2009-01-01 00:00:28.000 001     23167.73   5136.39 -53071.11  58134.92
2009-01-01 00:00:29.000 001     23167.71   5136.41 -53071.11  58134.91
2009-01-01 00:00:30.000 001     23167.68   5136.40 -53071.18  58134.96
2009-01-01 00:00:31.000 001     23167.73   5136.39 -53071.11  58134.92
2009-01-01 00:00:32.000 001     23167.75   5136.38 -53071.08  58134.90
2009-01-01 00:00:33.000 001     23167.74   5136.36 -53071.11  58134.92
2009-01-01 00:00:34.000 001     23167.76   5136.35 -53071.08  58134.90
2009-01-01 00:00:35.000 001     23167.74   5136.36 -53071.08  58134.89
2009-01-01 00:00:36.000 001     23167.77   5136.37 -53071.08  58134.91
2009-01-01 00:00:37.000 001     23167.77   5136.37 -53071.06  58134.89
2009-01-01 00:00:38.000 001     23167.79   5136.35 -53071.08  58134.91
2009-01-01 00:00:39.000 001     23167.85   5136.35 -53071.06  58134.92
2009-01-01 00:00:40.000 001     23167.81   5136.34 -53071.08  58134.92
2009-01-01 00:00:41.000 001     23167.79   5136.35 -53071.08  58134.91
2009-01-01 00:00:42.000 001     23167.81   5136.34 -53071.08  58134.92
2009-01-01 00:00:43.000 001     23167.81   5136.34 -53071.08  58134.92
2009-01-01 00:00:44.000 001     23167.91   5136.36 -53071.01  58134.90
2009-01-01 00:00:45.000 001     23167.83   5136.36 -53071.08  58134.93
2009-01-01 00:00:46.000 001     23167.85   5136.35 -53071.08  58134.94
2009-01-01 00:00:47.000 001     23167.85   5136.35 -53071.06  58134.92
2009-01-01 00:00:48.000 001     23167.85   5136.35 -53071.08  58134.94
2009-01-01 00:00:49.000 001     23167.83   5136.36 -53071.11  58134.96
2009-01-01 00:00:50.000 001     23167.84   5136.38 -53071.08  58134.94
2009-01-01 00:00:51.000 001     23167.84   5136.38 -53071.06  58134.92
2009-01-01 00:00:52.000 001     23167.82   5136.39 -53071.06  58134.91
2009-01-01 00:00:53.000 001     23167.81   5136.37 -53071.11  58134.95
2009-01-01 00:00:54.000 001     23167.82   5136.39 -53071.06  58134.91
2009-01-01 00:00:55.000 001     23167.80   5136.37 -53071.08  58134.92
2009-01-01 00:00:56.000 001     23167.80   5136.37 -53071.08  58134.92
2009-01-01 00:00:57.000 001     23167.73   5136.39 -53071.11  58134.92
2009-01-01 00:00:58.000 001     23167.80   5136.37 -53071.06  58134.90
2009-01-01 00:00:59.000 001     23167.80   5136.37 -53071.03  58134.87
2009-01-01 00:01:00.000 001     23167.80   5136.37 -53071.03  58134.87
2009-01-01 00:01:01.000 001     23167.79   5136.35 -53071.06  58134.89
2009-01-01 00:01:02.000 001     23167.77   5136.37 -53071.08  58134.91
2009-01-01 00:01:03.000 001     23167.78   5136.39 -53071.06  58134.89
2009-01-01 00:01:04.000 001     23167.78   5136.39 -53071.03  58134.87
2009-01-01 00:01:05.000 001     23167.73   5136.36 -53071.03  58134.84
2009-01-01 00:01:06.000 001     23167.70   5136.39 -53071.11  58134.91
2009-01-01 00:01:07.000 001     23167.75   5136.38 -53071.03  58134.85
2009-01-01 00:01:08.000 001     23167.71   5136.41 -53071.08  58134.89
2009-01-01 00:01:09.000 001     23167.71   5136.41 -53071.06  58134.87
2009-01-01 00:01:10.000 001     23167.69   5136.42 -53071.06  58134.86
2009-01-01 00:01:11.000 001     23167.60   5136.42 -53071.11  58134.87
2009-01-01 00:01:12.000 001     23167.69   5136.42 -53071.06  58134.86
2009-01-01 00:01:13.000 001     23167.64   5136.45 -53071.06  58134.84
2009-01-01 00:01:14.000 001     23167.64   5136.45 -53071.06  58134.84
2009-01-01 00:01:15.000 001     23167.61   5136.44 -53071.08  58134.85
2009-01-01 00:01:16.000 001     23167.63   5136.46 -53071.08  58134.86
2009-01-01 00:01:17.000 001     23167.63   5136.43 -53071.06  58134.84
2009-01-01 00:01:18.000 001     23167.63   5136.43 -53071.06  58134.84
2009-01-01 00:01:19.000 001     23167.67   5136.40 -53071.06  58134.85
2009-01-01 00:01:20.000 001     23167.63   5136.37 -53071.11  58134.88
2009-01-01 00:01:21.000 001     23167.69   5136.39 -53071.06  58134.86
2009-01-01 00:01:22.000 001     23167.72   5136.34 -53071.06  58134.87
2009-01-01 00:01:23.000 001     23167.73   5136.30 -53071.06  58134.87
2009-01-01 00:01:24.000 001     23167.75   5136.29 -53071.06  58134.87
2009-01-01 00:01:25.000 001     23167.69   5136.24 -53071.08  58134.86
2009-01-01 00:01:26.000 001     23167.75   5136.26 -53071.06  58134.87
2009-01-01 00:01:27.000 001     23167.78   5136.21 -53071.06  58134.88
2009-01-01 00:01:28.000 001     23167.80   5136.19 -53071.03  58134.86
2009-01-01 00:01:29.000 001     23167.81   5136.16 -53071.06  58134.89
2009-01-01 00:01:30.000 001     23167.83   5136.15 -53071.03  58134.87
2009-01-01 00:01:31.000 001     23167.85   5136.13 -53071.01  58134.85
2009-01-01 00:01:32.000 001     23167.86   5136.10 -53071.03  58134.87
2009-01-01 00:01:33.000 001     23167.86   5136.10 -53071.01  58134.85
2009-01-01 00:01:34.000 001     23167.79   5136.08 -53071.06  58134.87
2009-01-01 00:01:35.000 001     23167.83   5136.06 -53071.01  58134.84
2009-01-01 00:01:36.000 001     23167.82   5136.09 -53071.01  58134.84
2009-01-01 00:01:37.000 001     23167.81   5136.07 -53071.01  58134.83
2009-01-01 00:01:38.000 001     23167.81   5136.07 -53071.01  58134.83
2009-01-01 00:01:39.000 001     23167.75   5136.08 -53071.06  58134.86
2009-01-01 00:01:40.000 001     23167.79   5136.05 -53071.01  58134.82
2009-01-01 00:01:41.000 001     23167.77   5136.10 -53071.01  58134.82
2009-01-01 00:01:42.000 001     23167.77   5136.10 -53071.01  58134.82
2009-01-01 00:01:43.000 001     23167.78   5136.12 -53071.01  58134.82
2009-01-01 00:01:44.000 001     23167.78   5136.12 -53070.96  58134.78
2009-01-01 00:01:45.000 001     23167.78   5136.12 -53071.01  58134.82
2009-01-01 00:01:46.000 001     23167.74   5136.14 -53070.98  58134.78
2009-01-01 00:01:47.000 001     23167.76   5136.13 -53070.98  58134.79
2009-01-01 00:01:48.000 001     23167.85   5136.13 -53070.93  58134.78
2009-01-01 00:01:49.000 001     23167.77   5136.15 -53070.98  58134.80
2009-01-01 00:01:50.000 001     23167.81   5136.12 -53070.98  58134.81
2009-01-01 00:01:51.000 001     23167.79   5136.14 -53071.01  58134.83
2009-01-01 00:01:52.000 001     23167.81   5136.16 -53071.01  58134.84
2009-01-01 00:01:53.000 001     23167.73   5136.18 -53071.03  58134.83
2009-01-01 00:01:54.000 001     23167.81   5136.16 -53070.98  58134.81
2009-01-01 00:01:55.000 001     23167.83   5136.15 -53070.98  58134.82
2009-01-01 00:01:56.000 001     23167.78   5136.17 -53070.96  58134.78
2009-01-01 00:01:57.000 001     23167.79   5136.17 -53071.01  58134.83
2009-01-01 00:01:58.000 001     23167.77   5136.15 -53071.01  58134.82
2009-01-01 00:01:59.000 001     23167.79   5136.17 -53071.01  58134.83
2009-01-01 00:02:00.000 001     23167.77   5136.15 -53071.01  58134.82
2009-01-01 00:02:01.000 001     23167.79   5136.17 -53070.98  58134.81
2009-01-01 00:02:02.000 001     23167.84   5136.17 -53070.93  58134.78
2009-01-01 00:02:03.000 001     23167.73   5136.18 -53070.96  58134.76
2009-01-01 00:02:04.000 001     23167.76   5136.19 -53070.98  58134.80
2009-01-01 00:02:05.000 001     23167.78   5136.17 -53070.96  58134.78
2009-01-01 00:02:06.000 001     23167.76   5136.19 -53070.98  58134.80
2009-01-01 00:02:07.000 001     23167.71   5136.19 -53071.01  58134.80
2009-01-01 00:02:08.000 001     23167.76   5136.19 -53070.98  58134.80
2009-01-01 00:02:09.000 001     23167.76   5136.22 -53070.98  58134.80
2009-01-01 00:02:10.000 001     23167.76   5136.22 -53070.98  58134.80
2009-01-01 00:02:11.000 001     23167.74   5136.23 -53071.01  58134.82
2009-01-01 00:02:12.000 001     23167.79   5136.26 -53071.01  58134.84
2009-01-01 00:02:13.000 001     23167.77   5136.28 -53071.01  58134.84
2009-01-01 00:02:14.000 001     23167.74   5136.32 -53071.01  58134.83
2009-01-01 00:02:15.000 001     23167.77   5136.33 -53070.98  58134.81
2009-01-01 00:02:16.000 001     23167.81   5136.39 -53070.96  58134.82
2009-01-01 00:02:17.000 001     23167.72   5136.43 -53071.01  58134.83
2009-01-01 00:02:18.000 001     23167.71   5136.46 -53071.01  58134.83
2009-01-01 00:02:19.000 001     23167.71   5136.50 -53071.01  58134.83
2009-01-01 00:02:20.000 001     23167.68   5136.51 -53071.01  58134.82
2009-01-01 00:02:21.000 001     23167.62   5136.55 -53071.06  58134.84
2009-01-01 00:02:22.000 001     23167.67   5136.58 -53071.03  58134.84
2009-01-01 00:02:23.000 001     23167.67   5136.58 -53071.03  58134.84
2009-01-01 00:02:24.000 001     23167.67   5136.62 -53071.06  58134.87
2009-01-01 00:02:25.000 001     23167.65   5136.63 -53071.06  58134.86
2009-01-01 00:02:26.000 001     23167.65   5136.63 -53071.03  58134.84
2009-01-01 00:02:27.000 001     23167.68   5136.64 -53071.03  58134.85
2009-01-01 00:02:28.000 001     23167.65   5136.63 -53071.06  58134.86
2009-01-01 00:02:29.000 001     23167.65   5136.63 -53071.06  58134.86
2009-01-01 00:02:30.000 001     23167.58   5136.62 -53071.11  58134.88
2009-01-01 00:02:31.000 001     23167.65   5136.63 -53071.06  58134.86
2009-01-01 00:02:32.000 001     23167.62   5136.64 -53071.03  58134.83
2009-01-01 00:02:33.000 001     23167.65   5136.63 -53071.03  58134.84
2009-01-01 00:02:34.000 001     23167.61   5136.62 -53071.06  58134.85
2009-01-01 00:02:35.000 001     23167.73   5136.57 -53070.98  58134.82
2009-01-01 00:02:36.000 001     23167.60   5136.57 -53071.06  58134.84
2009-01-01 00:02:37.000 001     23167.60   5136.57 -53071.06  58134.84
2009-01-01 00:02:38.000 001     23167.65   5136.54 -53071.06  58134.86
2009-01-01 00:02:39.000 001     23167.66   5136.56 -53071.03  58134.83
2009-01-01 00:02:40.000 001     23167.70   5136.53 -53071.03  58134.85
2009-01-01 00:02:41.000 001     23167.71   5136.50 -53071.03  58134.85
2009-01-01 00:02:42.000 001     23167.69   5136.51 -53071.03  58134.84
2009-01-01 00:02:43.000 001     23167.69   5136.51 -53071.03  58134.84
2009-01-01 00:02:44.000 001     23167.81   5136.48 -53070.96  58134.82
2009-01-01 00:02:45.000 001     23167.71   5136.50 -53071.03  58134.85
2009-01-01 00:02:46.000 001     23167.71   5136.50 -53071.01  58134.83
2009-01-01 00:02:47.000 001     23167.69   5136.48 -53071.03  58134.84
2009-01-01 00:02:48.000 001     23167.71   5136.46 -53071.01  58134.83
2009-01-01 00:02:49.000 001     23167.76   5136.46 -53070.93  58134.77
2009-01-01 00:02:50.000 001     23167.71   5136.46 -53071.03  58134.85
2009-01-01 00:02:51.000 001     23167.71   5136.46 -53071.03  58134.85
2009-01-01 00:02:52.000 001     23167.67   5136.49 -53071.03  58134.83
2009-01-01 00:02:53.000 001     23167.71   5136.46 -53071.01  58134.83
2009-01-01 00:02:54.000 001     23167.67   5136.49 -53071.01  58134.81
2009-01-01 00:02:55.000 001     23167.67   5136.49 -53071.03  58134.83
2009-01-01 00:02:56.000 001     23167.62   5136.46 -53071.03  58134.81
2009-01-01 00:02:57.000 001     23167.58   5136.49 -53071.03  58134.80
2009-01-01 00:02:58.000 001     23167.70   5136.50 -53070.96  58134.78
2009-01-01 00:02:59.000 001     23167.58   5136.49 -53071.03  58134.80
2009-01-01 00:03:00.000 001     23167.55   5136.48 -53071.03  58134.78
2009-01-01 00:03:01.000 001     23167.55   5136.48 -53071.03  58134.78
2009-01-01 00:03:02.000 001     23167.51   5136.48 -53071.03  58134.77
2009-01-01 00:03:03.000 001     23167.57   5136.47 -53070.98  58134.74
2009-01-01 00:03:04.000 001     23167.46   5136.45 -53071.03  58134.74
2009-01-01 00:03:05.000 001     23167.44   5136.46 -53071.03  58134.74
2009-01-01 00:03:06.000 001     23167.44   5136.46 -53071.01  58134.72
2009-01-01 00:03:07.000 001     23167.46   5136.45 -53071.01  58134.73
2009-01-01 00:03:08.000 001     23167.48   5136.44 -53071.01  58134.73
2009-01-01 00:03:09.000 001     23167.48   5136.44 -53071.01  58134.73
2009-01-01 00:03:10.000 001     23167.49   5136.40 -53071.03  58134.75
2009-01-01 00:03:11.000 001     23167.51   5136.42 -53071.03  58134.76
2009-01-01 00:03:12.000 001     23167.61   5136.44 -53070.93  58134.71
2009-01-01 00:03:13.000 001     23167.54   5136.43 -53071.03  58134.77
2009-01-01 00:03:14.000 001     23167.57   5136.44 -53071.03  58134.79
2009-01-01 00:03:15.000 001     23167.59   5136.46 -53071.03  58134.80
2009-01-01 00:03:16.000 001     23167.62   5136.46 -53071.03  58134.81
2009-01-01 00:03:17.000 001     23167.68   5136.51 -53070.98  58134.79
2009-01-01 00:03:18.000 001     23167.63   5136.52 -53071.03  58134.82
2009-01-01 00:03:19.000 001     23167.64   5136.57 -53071.03  58134.83
2009-01-01 00:03:20.000 001     23167.61   5136.62 -53071.03  58134.82
2009-01-01 00:03:21.000 001     23167.64   5136.66 -53071.01  58134.82
2009-01-01 00:03:22.000 001     23167.59   5136.73 -53071.03  58134.82
2009-01-01 00:03:23.000 001     23167.53   5136.77 -53071.03  58134.80
2009-01-01 00:03:24.000 001     23167.52   5136.80 -53071.06  58134.83
2009-01-01 00:03:25.000 001     23167.47   5136.86 -53071.06  58134.81
2009-01-01 00:03:26.000 001     23167.57   5136.92 -53071.01  58134.81
2009-01-01 00:03:27.000 001     23167.42   5136.96 -53071.08  58134.82
2009-01-01 00:03:28.000 001     23167.43   5136.98 -53071.08  58134.83
2009-01-01 00:03:29.000 001     23167.41   5137.03 -53071.10  58134.84
2009-01-01 00:03:30.000 001     23167.35   5137.07 -53071.08  58134.80
2009-01-01 00:03:31.000 001     23167.45   5137.09 -53071.06  58134.82
2009-01-01 00:03:32.000 001     23167.35   5137.13 -53071.13  58134.85
2009-01-01 00:03:33.000 001     23167.33   5137.14 -53071.13  58134.85
2009-01-01 00:03:34.000 001     23167.33   5137.14 -53071.13  58134.85
2009-01-01 00:03:35.000 001     23167.35   5137.16 -53071.10  58134.83
2009-01-01 00:03:36.000 001     23167.35   5137.16 -53071.15  58134.87
2009-01-01 00:03:37.000 001     23167.34   5137.20 -53071.15  58134.87
2009-01-01 00:03:38.000 001     23167.34   5137.20 -53071.15  58134.87
2009-01-01 00:03:39.000 001     23167.36   5137.18 -53071.15  58134.88
2009-01-01 00:03:40.000 001     23167.44   5137.22 -53071.08  58134.85
2009-01-01 00:03:41.000 001     23167.36   5137.22 -53071.15  58134.88
2009-01-01 00:03:42.000 001     23167.34   5137.20 -53071.15  58134.87
2009-01-01 00:03:43.000 001     23167.36   5137.22 -53071.18  58134.91
2009-01-01 00:03:44.000 001     23167.39   5137.22 -53071.18  58134.92
2009-01-01 00:03:45.000 001     23167.42   5137.23 -53071.13  58134.89
2009-01-01 00:03:46.000 001     23167.36   5137.18 -53071.15  58134.88
2009-01-01 00:03:47.000 001     23167.38   5137.17 -53071.15  58134.89
2009-01-01 00:03:48.000 001     23167.40   5137.15 -53071.15  58134.89
2009-01-01 00:03:49.000 001     23167.45   5137.13 -53071.15  58134.91
2009-01-01 00:03:50.000 001     23167.43   5137.11 -53071.15  58134.90
2009-01-01 00:03:51.000 001     23167.46   5137.06 -53071.18  58134.94
2009-01-01 00:03:52.000 001     23167.48   5137.04 -53071.18  58134.94
2009-01-01 00:03:53.000 001     23167.47   5137.02 -53071.18  58134.94
2009-01-01 00:03:54.000 001     23167.59   5137.03 -53071.11  58134.92
2009-01-01 00:03:55.000 001     23167.49   5136.98 -53071.15  58134.91
2009-01-01 00:03:56.000 001     23167.51   5136.96 -53071.18  58134.95
2009-01-01 00:03:57.000 001     23167.50   5136.94 -53071.15  58134.91
2009-01-01 00:03:58.000 001     23167.52   5136.93 -53071.13  58134.90
2009-01-01 00:03:59.000 001     23167.62   5136.89 -53071.11  58134.92
2009-01-01 00:04:00.000 001     23167.53   5136.86 -53071.13  58134.90
2009-01-01 00:04:01.000 001     23167.55   5136.84 -53071.13  58134.91
2009-01-01 00:04:02.000 001     23167.57   5136.83 -53071.13  58134.91
2009-01-01 00:04:03.000 001     23167.61   5136.84 -53071.08  58134.88
2009-01-01 00:04:04.000 001     23167.59   5136.82 -53071.11  58134.90
2009-01-01 00:04:05.000 001     23167.54   5136.82 -53071.13  58134.90
2009-01-01 00:04:06.000 001     23167.54   5136.82 -53071.11  58134.88
2009-01-01 00:04:07.000 001     23167.55   5136.79 -53071.13  58134.90
2009-01-01 00:04:08.000 001     23167.61   5136.80 -53071.06  58134.86
2009-01-01 00:04:09.000 001     23167.51   5136.78 -53071.11  58134.87
2009-01-01 00:04:10.000 001     23167.49   5136.80 -53071.13  58134.88
2009-01-01 00:04:11.000 001     23167.48   5136.77 -53071.13  58134.87
2009-01-01 00:04:12.000 001     23167.46   5136.79 -53071.11  58134.85
2009-01-01 00:04:13.000 001     23167.45   5136.79 -53071.08  58134.82
2009-01-01 00:04:14.000 001     23167.39   5136.77 -53071.13  58134.84
2009-01-01 00:04:15.000 001     23167.35   5136.77 -53071.13  58134.82
2009-01-01 00:04:16.000 001     23167.32   5136.76 -53071.11  58134.79
2009-01-01 00:04:17.000 001     23167.36   5136.73 -53071.08  58134.78
2009-01-01 00:04:18.000 001     23167.30   5136.74 -53071.11  58134.78
2009-01-01 00:04:19.000 001     23167.30   5136.74 -53071.11  58134.78
2009-01-01 00:04:20.000 001     23167.29   5136.72 -53071.11  58134.77
2009-01-01 00:04:21.000 001     23167.27   5136.73 -53071.13  58134.79
2009-01-01 00:04:22.000 001     23167.40   5136.70 -53071.06  58134.77
2009-01-01 00:04:23.000 001     23167.26   5136.71 -53071.15  58134.80
2009-01-01 00:04:24.000 001     23167.26   5136.68 -53071.11  58134.76
2009-01-01 00:04:25.000 001     23167.26   5136.68 -53071.11  58134.76
2009-01-01 00:04:26.000 001     23167.24   5136.69 -53071.13  58134.77
2009-01-01 00:04:27.000 001     23167.29   5136.68 -53071.08  58134.74
2009-01-01 00:04:28.000 001     23167.22   5136.70 -53071.13  58134.76
2009-01-01 00:04:29.000 001     23167.21   5136.68 -53071.13  58134.76
2009-01-01 00:04:30.000 001     23167.20   5136.72 -53071.13  58134.76
2009-01-01 00:04:31.000 001     23167.22   5136.70 -53071.10  58134.74
2009-01-01 00:04:32.000 001     23167.16   5136.75 -53071.13  58134.74
2009-01-01 00:04:33.000 001     23167.10   5136.79 -53071.13  58134.72
2009-01-01 00:04:34.000 001     23167.10   5136.79 -53071.13  58134.72
2009-01-01 00:04:35.000 001     23167.05   5136.81 -53071.13  58134.70
2009-01-01 00:04:36.000 001     23167.10   5136.84 -53071.10  58134.70
2009-01-01 00:04:37.000 001     23166.98   5136.84 -53071.15  58134.70
2009-01-01 00:04:38.000 001     23166.94   5136.86 -53071.15  58134.68
2009-01-01 00:04:39.000 001     23166.91   5136.91 -53071.15  58134.68
2009-01-01 00:04:40.000 001     23166.88   5136.90 -53071.15  58134.66
2009-01-01 00:04:41.000 001     23166.90   5136.9

            

            
            
            

    

        

	
    

        
Best Answer
    

    

								

								
Hello Aliaa,
It's good that your files are plain text, you can open them in MATLAB easily.
You need to write a program, consisted of a for loop which has the same number as the number of your files 365.
It's also good that you know all the headers are from line 1 to 21, as you can simply get rid of them.
Hopefully, your files have some sort of order in their names, like cnb1,cnb2,...,cnb365 or any other order.
lets say cnb1 is the first file we want to edit.
use fopen to open cnb1
use fopen to open another file in a different folder with the same name cnb1 (this is going to be the new file without the header)
use getl to read one line at a time
create a while loop to read and write line by line to the files, while should stop when the result of fgetl is empty
make a counter for lines in the while loop
make an if so when the number of counter is smaller than 21 it won't write to the new cnb1 file.
that's all!
finally outside the while loop close both files using fclose
see these in MATLAB documentation
doc fopen
doc fclose
doc fgetl
doc while
doc for
Oh! in the main for loop before you open cnb1 cnb2 and ... you need to create their names lets assume
for i = 1 :10
 filename = ['C:\myFolder\cnb',num2str(i),'.txt'];
Although your files are not txt it's just an assumption.
Give it a try, and let us know if you have prob.
I'll attach a similar file where I edited a txt file, just to see how you can open files, read them and ...
Good Luck!
						    
						
		
    
        

    

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It will tell you, with a red squiggly underline where the problem is. In your case you have this "number" in there:
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Answer 1

Hello Aliaa,

It's good that your files are plain text, you can open them in MATLAB easily.

You need to write a program, consisted of a for loop which has the same number as the number of your files 365.

It's also good that you know all the headers are from line 1 to 21, as you can simply get rid of them.

Hopefully, your files have some sort of order in their names, like cnb1,cnb2,...,cnb365 or any other order.

lets say cnb1 is the first file we want to edit.

use fopen to open cnb1

use fopen to open another file in a different folder with the same name cnb1 (this is going to be the new file without the header)

use getl to read one line at a time

create a while loop to read and write line by line to the files, while should stop when the result of fgetl is empty

make a counter for lines in the while loop

make an if so when the number of counter is smaller than 21 it won't write to the new cnb1 file.

that's all!

finally outside the while loop close both files using fclose

see these in MATLAB documentation

doc fopen
doc fclose
doc fgetl
doc while
doc for

Oh! in the main for loop before you open cnb1 cnb2 and ... you need to create their names lets assume

for i = 1 :10
 filename = ['C:\myFolder\cnb',num2str(i),'.txt'];

Although your files are not txt it's just an assumption.

Give it a try, and let us know if you have prob.

I'll attach a similar file where I edited a txt file, just to see how you can open files, read them and ...

Good Luck!