Find a word in a text file and read values from that line

Question

aero123 2022-3-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1665134-find-a-word-in-a-text-file-and-read-values-from-that-line

评论： Arif Hoq 2022-3-8

Example :

File name:             mhcb0020.03o
Rinex version:         2 
File type:             Observation
Satellite system:      GPS
Position_reference (X/Y/Z): -2664065.576700  -4323178.973800  3848368.475300
Antenna-delta (H/E/N): 0.068700  0.000000  0.000000

I need to extract the 3 values after 'Position_reference(X/Y/Z)' from the text file.

Can you help me with this?

Thanks

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Answer 1

Arif Hoq 2022-3-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1665134-find-a-word-in-a-text-file-and-read-values-from-that-line#answer_911484

在 MATLAB Online 中打开

example2.txt

A=readtable('example2.txt','delimiter',':');
Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.
output=table2array(A(4,2))
output = 1×1 cell array
    {'-2664065.576700  -4323178.973800  3848368.475300'}

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Arif Hoq 2022-3-7

编辑：Arif Hoq 2022-3-7

在 MATLAB Online 中打开

example2.txt

or if you want to find the string (Position_reference (X/Y/Z)) in the text file

A=readtable('example2.txt','delimiter',':','ReadVariableNames',false);
str=string(table2array(A));
[idx]=find(str=={'Position_reference (X/Y/Z)'});
output=str(idx,2) % string
output = "-2664065.576700  -4323178.973800  3848368.475300"
% for numeric result
format longG
numeric_output=rmmissing(str2double(split(output,' ')))
numeric_output = 3×1
	1.0e+00 *

             -2664065.5767
             -4323178.9738
              3848368.4753