Question

您好我使用以下代码从data.txt中包含'GPGGA'的行中读取一些值

fid = fopen('D:\data.txt','r');
A=textscan(fid,'%s %*s %f %s %f %s %*s %*s %*s %*s %*s %*s %*s %*s %*s,'Delimiter',',');
fclose(fid);
Loc = [A{[2, 4]}];
row_idxs = cellfun( @(s) strcmp(s, '$GPGGA'), A{1});
Loc = Loc(row_idxs, :);
display(Loc);

如果删除data.txt中的最后一行，代码将完美运行。不确定为什么当最后一行包含在文本文件中时它会抛出此错误。是什么原因？我很困惑！

“???使用==＆gt; horzcat时出错 CAT参数维度不一致。 ==＆gt;中的错误4点试试 Loc = [A {[2,4]}];“

data.txt中

$GPGSV,4,1,16,05,15,046,23,29,47,071,21,16,31,291,18,31,39,202,18*73
$GPGSV,4,1,16,05,15,046,23,29,47,071,21,16,31,291,18,31,39,202,18*73
$GPGSV,4,1,16,05,15,046,23,29,47,071,21,16,31,291,18,31,39,202,18*73
$GPGSV,4,1,16,05,15,046,23,29,47,071,21,16,31,291,18,31,39,202,18*73
$GPGSV,4,2,16,23,13,298,17,25,15,119,17,06,22,247,16,03,04,251,14*75
$GPGSV,4,2,16,23,13,298,17,25,15,119,17,06,22,247,16,03,04,251,14*75
$GPGSV,4,2,16,23,13,298,17,25,15,119,17,06,22,247,16,03,04,251,14*75
$GPGSV,4,2,16,23,13,298,17,25,15,119,17,06,22,247,16,03,04,251,14*75

$GPGGA,1.8,98.90,S,18.0014,E,1,04,1.0,87.8,M,48.0,M,,*76
$GPGGA,1.3,98.91,S,18.0015,E,1,04,1.0,100.7,M,48.0,M,,*40
$GPGGA,1.3,98.92,S,18.0016,E,1,04,1.0,105.4,M,48.0,M,,*4F
$GPGGA,1.8,98.93,S,18.0017,E,1,04,1.0,87.8,M,48.0,M,,*76
$GPGGA,1.8,98.94,S,18.0018,E,1,04,1.0,87.8,M,48.0,M,,*76
$GPGSV,4,4,16,27,,,,26,,,,24,,,,22,,,*79

Answer 1

你的格式字符串不好。它仅表示15列。您发布的样本数据有20列。我建议使用以下代码（在我的机器上运行时没有错误）：

fid = fopen('D:\data.txt','r');
A=textscan(fid,'%s %*s %f %s %f %s %*[^\n]', 'Delimiter',',');
fclose(fid);
Loc = [A{[2, 4]}];
row_idxs = cellfun( @(s) strcmp(s, '$GPGGA'), A{1});
Loc = Loc(row_idxs, :);
display(Loc);

请注意格式字符串中的构造%*[^\n]。这告诉textscan从此时开始忽略所有列。它比一遍又一遍地写出大量的%*s要简洁得多。此外，这意味着在构建格式字符串时，您不太可能错误计算列数： - ）

Matlab文本可能出错：cellfun从某些行中选择数据

1 个答案: