creating an array from a txt file
显示 更早的评论
sorry if this is a silly question, but I have just started to use matlab.
I am trying to create an array using the txt file 'ifng.txt' however I want to remove the first row as it is just headers, this is what I have so far
function output = IFNG2016
fid= fopen('ifng.txt','r');
A = textscan(fid, '%f', 'HeaderLines', 1)
however it just prints
A= [0x1 Double]
any assistance would be appreciated.
Thanks
6 个评论
Thorsten
2016-6-28
It would be helpful to upload the file ifng.txt.
Andreas Donauer
2016-6-28
编辑：Andreas Donauer
2016-6-28
One of many posibilities:
% open the file
fid = fopen('ifng.txt'); % could check if fid is nonempty here
% read first line
tline = fgets(fid);
index = 0;
% if char (not end of file), keep reading
while ischar(tline)
index = index+1;
txt{index} = tline(1:end-1); % store line in a cell-array-of-strings
tline = fgets(fid);
end
% close file
fclose(fid);
% re-format starting from line 2
script = sprintf('%s',txt{2:end});
% replace line feeds (windows)
script(script==13) = sprintf('\n');
% finally, print what you've been reading in command line:
fprintf(script);
Andreas Donauer
2016-6-28
Have you tried what I posted? If this works for you, please check the question solved.
Star Strider
2016-6-28
@Andreas Donauer —
Post your Comment here as an Answer.
C Mck
2016-6-28
采纳的回答
The reason your textscan does not work is simply because the first column (the probe name) is not made of numbers so the '%f' format fails on that. This would work (and is much better than the whole file parsing suggested by Andreas):
fid= fopen('ifng.txt','r');
A = textscan(fid, ['%s', repmat('%f', 1 , 25)], 'HeaderLines', 1);
Anumbers = [A{2:end}];
Note that in the header, your file uses a combination of tabs and spaces as the delimiter. If you actually fixed that, then reading the file would be as simple as:
t = readtable('ifng.txt', 'Delimiter', 'tab'); %or 'space' if you replace the tabs by spaces
As a bonus you get the header read properly as variable names, so you don't even need to skip it.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 的更多信息
Translated by 
