我有一个.txt数据文件,开头有几行文本注释,后跟实际数据列。它看起来像这样:
lens (mm): 150
Power (uW): 24.4
Inner circle: 56x56
Outer Square: 256x320
remarks: this run looks good
2.450000E+1 6.802972E+7 1.086084E+6 1.055582E-5 1.012060E+0 1.036552E+0
2.400000E+1 6.866599E+7 1.088730E+6 1.055617E-5 1.021491E+0 1.039043E+0
2.350000E+1 6.858724E+7 1.086425E+6 1.055993E-5 1.019957E+0 1.036474E+0
2.300000E+1 6.848760E+7 1.084434E+6 1.056495E-5 1.017992E+0 1.034084E+0
通过使用importdata
,Matlab会自动分离文本数据和实际数据。但是如何从文本中提取这些数字数据(以单元格格式存储)?我想要做的是:
1是最重要的,2或3是可选的。如果这简化了代码,我也很乐意更改文本注释的格式。
答案 0 :(得分:1)
假设您的示例数据保存为demo.txt
,您可以执行以下操作:
function q47203382
%% Reading from file:
COMMENT_ROWS = 5;
% Read info rows:
fid = fopen('demo.txt','r'); % open for reading
txt = textscan(fid,'%s',COMMENT_ROWS,'delimiter', '\n'); txt = txt{1};
fclose(fid);
% Read data rows:
numData = dlmread('demo.txt',' ',COMMENT_ROWS,0);
%% Processing:
desc = cell(5,1);
unit = cell(2,1);
quant = cell(5,1);
for ind1 = 1:numel(txt)
if ind1 <= 2
[desc{ind1}, unit{ind1}, quant{ind1}] = readWithUnit(txt{ind1});
else
[desc{ind1}, quant{ind1}] = readWOUnit(txt{ind1});
end
end
%% Display:
disp(desc);
disp(unit);
disp(quant);
disp(mat2str(numData));
end
function [desc, unit, quant] = readWithUnit(str)
tmp = strsplit(str,{' ','(',')',':'});
[desc, unit, quant] = tmp{:};
end
function [desc, quant] = readWOUnit(str)
tmp = strtrim(strsplit(str,': '));
[desc, quant] = tmp{:};
end
我们分两个阶段阅读数据:textscan
表示开头的评论行,dlmread
表示以下数字数据。然后,这是分割文本以获取各种信息的问题。
以上是上述的输出:
>> q47203382
'lens'
'Power'
'Inner circle'
'Outer Square'
'remarks'
'mm'
'uW'
'150'
'24.4'
'56x56'
'256x320'
'this run looks good'
[24.5 68029720 1086084 1.055582e-05 1.01206 1.036552;
24 68665990 1088730 1.055617e-05 1.021491 1.039043;
23.5 68587240 1086425 1.055993e-05 1.019957 1.036474;
23 68487600 1084434 1.056495e-05 1.017992 1.034084]
(我冒昧地将输出格式化一点以便于查看。)
另请参阅:str2double
。