Having trouble using cell2mat

Question

Francisco Michel 2019-9-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/479807-having-trouble-using-cell2mat

编辑： Adam Danz 2019-9-13

SR4.txt

I need to read a txt file for a class and I can read the file and can extract the information that I need from the file but when I try to convert from a cell array to matrix in order to do mathematical operations on it gives me a error here is the code and the error message

fid=fopen('SR4.txt','r');
filedata=textscan(fid,'%s%s','Delimiter','\t','headerlines',1);
x=filedata{1,1};
X=x(3:end);
y=filedata{1,2};
Y_cell=y(3:end);
Y_Matrix=cell2mat(Y_cell);
fclose(fid);
Error in cell2mat (line 83)
 m{n} = cat(1,c{:,n});
Error in ME190lab (line 7)
Y_Matrix=cell2mat(Y_cell);

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dpb 2019-9-11

在 MATLAB Online 中打开

fid=fopen('SR4.txt','r');
filedata=textscan(fid,'%s%s','Delimiter','\t','headerlines',1)
...

But, your file has three header lines, not just 1 before you get to numeric data.

So, why not read the numeric data directly as numeric instead of strings to convert later?

If you want the header info, unless your assignment requires textscan, why not use readtable instead which can handle the header line and the variableunits line as well (with a little help with detectimportoptions)

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Answer 1

Adam Danz 2019-9-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/479807-having-trouble-using-cell2mat#answer_391305

编辑：Adam Danz 2019-9-13

在 MATLAB Online 中打开

You were on the right track. You're reading the data as cell array of strings so you need to convert the data to numeric using str2double.

fid=fopen('SR4.txt','r');
filedata=textscan(fid,'%s%s','Delimiter','\t','headerlines',1);
fclose(fid);
m = str2double([filedata{1}(3:end), filedata{2}(3:end)]);