Question

我正在使用以下命令来读取csv文件：

fid=fopen('test.csv');
scannedData = textscan(fid, '%4.0u%2.0u%2.0u%2.0u%2.0u%2.0u,%u,%u,%q,%q,%f,%f,%.2f,%u','whitespace','"');
fclose(fid);

问题是，文本扫描不会从最后一个字段读取值，而是在1行后停止。跳过该字段，为其分配不同的类型，在文本扫描中使用大量的eof组合，没有任何帮助。

文件中的数据如下所示：

"20100324072328","501","1","str1","str2","4.6846712","52.0159507","1.250000","128.000000"
"20100324072519","501","1","str1","str2","4.6846122","52.0159346","0.000000","128.000000"
"20100324072640","501","1","str1","str2","4.6846014","52.0159453","0.000000","128.000000"
"20100324072812","501","1","str1","str2","4.6845907","52.0159507","0.000000","96.000000"
"20100324073002","501","1","str1","str2","4.6845800","52.0159614","0.000000","128.000000"

当我尝试使用上述命令时，我想直接用文本扫描解析第一个文件。

我不想使用%q读取字段的替代方法，然后解析生成的数组。

所以，我很感激有任何建议让文本可以一次完成。

感谢。

Answer 1

如果您想将"视为空格，那么您不应该使用需要双引号的%q来标识完整字符串，如果您认为它们是空格，则无法找到它们：

fid = fopen('test.txt');
fmt = '%4u%2u%2u%2u%2u%2u%u%u%s%s%f%f%f%u';
out = textscan(fid,fmt,'Delimiter',',','Whitespace','"')
fclose(fid)

或者我建议在评论中使用：

fmt = '"%4u%2u%2u%2u%2u%2u" "%u" "%u"%q%q"%f" "%f" "%f" "%u"';
out = textscan(fid,fmt,'Delimiter',',')

请注意我的空格" "，否则textscan()无法识别字段何时结束。

但是，我个人可能会明确将日期转换为序列日期

fmt = '%s%u%u%s%s%f%f%f%u';
out = textscan(fid,fmt,'Delimiter',',','Whitespace','"')
out{1} =  datenum(out{1},'yyyymmddHHMMSS');

文本扫描在1行后停止读取

1 个答案: