Using textscan() to get data from a TXT file, but all cells are NaN

Question

亦实胥 2021-11-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1587984-using-textscan-to-get-data-from-a-txt-file-but-all-cells-are-nan

评论：亦实胥 2021-11-17

采纳的回答： Chunru

在 MATLAB Online 中打开

Now i'm using textscan() to get data from a txt file.

The data in txt file just like "1,2,3,4

2,4,5,7"

[filename, pathname] = uigetfile( ...
    {'*.txt'}, ...
    'Pick a file');
fid = fopen([pathname filename],'r');
V = textscan(fid,'%0.f %0.f %0.f %0.f','Delimiter',',')
fclose(fid);

I want to get a data array V

but there are something wrong, the cells are [NaN]

I dont konw why.

Please tell me how to debug

v =
  1*7 cell array
    {[NaN]}    {[NaN]}    {[NaN]}    {[NaN]}

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Answer 1

Chunru 2021-11-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1587984-using-textscan-to-get-data-from-a-txt-file-but-all-cells-are-nan#answer_832754

在 MATLAB Online 中打开

Your format specifier is not correct.

s=["1,2,3,4"
    "2,4,5,7"]
s = 2×1 string array
    "1,2,3,4"
    "2,4,5,7"
V = textscan(s(1),'%f %f %f %f','Delimiter',',')
V = 1×4 cell array
    {[1]}    {[2]}    {[3]}    {[4]}
V = textscan(s(1),'%0.f %0.f %0.f %0.f','Delimiter',',')
V = 1×4 cell array
    {[NaN]}    {[NaN]}    {[NaN]}    {[NaN]}