Question

我正在尝试导出一组数据，对此我非常了解。有问题的数据具有以下结构：

#              ************************************
#              *****    GLOBAL ATTRIBUTES    ******
#              ************************************
#

#     PROJECT                         THEMIS
#
UT                                             UT      BX_FGL-D      BY_FGL-D      BZ_FGL-D
                                                         (@_1_)        (@_2_)        (@_3_)
dd-mm-yyyy hh:mm:ss.mil.mic.nan.pic           sec        nT_GSE        nT_GSE        nT_GSE
21-05-2015 00:00:00.223.693.846.740   1.43208E+09       1.14132       9.14226       27.1446
21-05-2015 00:00:00.473.693.845.716   1.43208E+09       1.11194       9.16192       27.1798
21-05-2015 00:00:00.723.693.844.692   1.43208E+09       1.12992       9.11103       27.1595
21-05-2015 00:00:00.973.693.843.668   1.43208E+09       1.15966       9.15324       27.1589
21-05-2015 00:00:01.223.693.846.740   1.43208E+09       1.20576       9.14420       27.1388
21-05-2015 00:09:59.973.693.843.668   1.43208E+09       1.97445       8.66407       26.1837
#  
# Key Parameter and Survey data (labels K0,K1,K2) are preliminary browse data.
# Generated by CDAWeb on: Mon May 27 06:01:29 2019

我要求将写在“ dd-mm-yyyy…。”和“＃＃关键参数”之间的内容导出到列中。例如。，第一行21-05-2015 00：00：00.223.693.846.740 1.43208E + 09 1.14132 9.14226 27.1446，必须导出到21，05,2015，00,00,00,223,693,846,740，1.43208E + 09,1.14132，9.14226和27.1446。

类似的问题已在Use MATLAB to extract data beyond "Data starts on next line:" in text-file中解决，但我认为我的数据很复杂，无法做进一步的事情。我能做的最好的事情就是编写一部分代码，直到“ dd-mm-yyyy”阅读为止：

clear;clc;close all;
f = fopen('dataa_file.txt');
line = fgetl(f);
while isempty(strfind(line, 'nT_GSE'))
    if line == -1 %// If we reach the end of the file, get out
        break;
    end
    line = fgetl(f);
end

任何帮助将深表感谢……

Answer 1

这似乎有效。假设

包含数字的第一行是以'dd-mm-yyyy'开头的行之后的数字。
包含数字的最后一行在以'# Key Parameter'开头的行的上方两行。

代码：

t = fileread('file.txt'); % Read the file as a character vector
t = strsplit(t, {'\r' '\n'}, 'CollapseDelimiters', true); % Split on newline or carriage
    % return. This gives a cell array with each line in a cell
ind_start = find(cellfun(@any, regexp(t, '^dd-mm-yyyy', 'once')), 1) + 1; % index of
    % line where the numbers begin: immediately after the line 'dd-mm-yyyy...'
ind_end = find(cellfun(@any, regexp(t, '^# Key Parameter', 'once')), 1) - 2; % index of
    % line where numbers end: two lines before the line '# Key Parameter...'
result = cellfun(@(u) sscanf(u, '%d-%d-%d %02d:%02d:%02d.%d.%d.%d.%d %f %f %f %f').', ...
    t(ind_start:ind_end), 'UniformOutput', false);
    % Apply sscanf to each line. The format specifier uses %d where needed to prevent
    % the dot from being interpreted as part of a floating point number. Also, the
    % possible existence of leading zeros needs to be taken into account. The result is
    % a cell array, where each cell contains a numeric vector corresponding to one line
result = cell2mat(result.'); % convert the result to a numerical array

使用Matlab提取文本之间的数据

1 个答案: