empty array size is stuck on 1x3

Question

Patrick Connolly 2021-10-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1571648-empty-array-size-is-stuck-on-1x3

编辑： per isakson 2021-10-26

%Start with an empty matrix
data=[];%Handle to open file
fileID=fopen('Track-16.gpx','r');
%Skip the first 14 lines
fscanf(fileID,'\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
%Scan through until the end of file(feof). Specification low level IO.
%Result transposed and formatted into single matrix
while ~feof(fileID)
    nextrow=fscanf(fileID, '%*s lat="%f" lon="%f">\n <ele>%f</ele>\n <time>2013-01-19T%f:%f:%f</time>\n'); 
    nextrow=nextrow';
    data=[data;nextrow];  
end
fclose(fileID)
%Separating data file into separate vectors. 
latitude=[data(1:end,1)];
longitude=[data(1:end,2)];
elevation=[data(1:end,3)];
hours=[data(1:end,4)];
minutes=[data(1:end,5)];
seconds=[data(1:end,6)];

THis is my error

Index in position 2 exceeds array bounds. Index must not exceed 3.
Error in test6 (line 19)
hours=[data(1:end,4)];

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Answer 1

per isakson 2021-10-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1571648-empty-array-size-is-stuck-on-1x3#answer_816448

编辑：per isakson 2021-10-26

在 MATLAB Online 中打开

Try replace

fscanf(fileID,'\n\n\n\n\n\n\n\n\n\n\n\n\n\n');

by

for jj = 1 : 14
    fgetl( fileID );
end

fscanf(fileID,'\n\n\n\n\n\n\n\n\n\n\n\n\n\n'); affects the current location of the position pointer in the specified file for blank lines only. (Test with ftell() .) Does the file starts with fourteen blank lines?