另一种方法可以memmapfile
用来修改内存中文件的前导字节。
例如:
% Set up data
LastName = {'Smith';'Johnson';'Williams';'Jones';'Brown'};
Age = [38;43;38;40;49];
Height = [71;69;64;67;64];
Weight = [176;163;131;133;119];
BloodPressure = [124 93; 109 77; 125 83; 117 75; 122 80];
T = table(Age, Height, Weight, BloodPressure, 'RowNames', LastName);
% Write data to CSV
fname = 'asdf.csv';
writetable(T, fname, 'WriteRowNames', true)
% Overwrite row dimension name in the first row
% Use memmapfile to map only the dimension name to memory
tmp = memmapfile(fname, 'Writable', true, 'Repeat', numel(T.Properties.DimensionNames{1}));
tmp.Data(:) = 32; % Change to the ASCII code for a space
clear('tmp'); % Clean up
这给我们带来了:
Row,Age,Height,Weight,BloodPressure_1,BloodPressure_2
Smith,38,71,176,124,93
Johnson,43,69,163,109,77
Williams,38,64,131,125,83
Jones,40,67,133,117,75
Brown,49,64,119,122,80
至:
,Age,Height,Weight,BloodPressure_1,BloodPressure_2
Smith,38,71,176,124,93
Johnson,43,69,163,109,77
Williams,38,64,131,125,83
Jones,40,67,133,117,75
Brown,49,64,119,122,80
不幸的是,没有完全删除,但这是一种有趣的方法。
或者,您可以使用 MATLAB 的低级文件 IO将行维度名称之后的所有内容复制到新文件中,然后覆盖原始文件:
fID = fopen(fname, 'r');
fID2 = fopen('tmp.csv', 'w');
fseek(fID, numel(T.Properties.DimensionNames{1}), 'bof');
fwrite(fID2, fread(fID));
fclose(fID);
fclose(fID2);
movefile('tmp.csv', fname);
产生:
,Age,Height,Weight,BloodPressure_1,BloodPressure_2
Smith,38,71,176,124,93
Johnson,43,69,163,109,77
Williams,38,64,131,125,83
Jones,40,67,133,117,75
Brown,49,64,119,122,80