Storing while loop values in a vector?? Error

Question

Kayla Magee 2018-7-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410599-storing-while-loop-values-in-a-vector-error

评论： Magdy Saleh 2018-7-16

采纳的回答： Magdy Saleh

fid = fopen('example.txt');

sample=[]; %empty matrix count=1;

tline=fgetl(fid); while ischar(tline) disp(tline) sample(count)=tline; count=count+1; tline=fgetl(fid); end

fclose(fid);

I am trying to run this while loop and save each value consecutively in the vector "sample". "sample" should end with one column and an unknown amount of rows of strings.

I am getting the error 'Subscripted assignment dimension mismatch.' Is it because I'm starting with an empty vector?? Is it because each row is a string?? Please help.

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Answer 1

Magdy Saleh 2018-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/410599-storing-while-loop-values-in-a-vector-error#answer_329029

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It might be easier here to use a cell array as such

fid = fopen('example.txt');
sample={}; %empty matrix count=1;
j = 1
tline=fgetl(fid);
while ischar(tline)
    disp(tline);
    sample{j} = tline
    tline=fgetl(fid);
    j = j+1 
end
fclose(fid);

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Magdy Saleh 2018-7-16

This is because you are trying to save a matrix (2D vector), which requires each vector to have the same number of characters. A cell array, or a vector of vectors, gives you the freedom to have them with different lengths.

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