Extract Data From .txt file

Question

Nicholas Kavouris 2022-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/1668079-extract-data-from-txt-file

回答： Gagan Agarwal 2023-11-16

Hello, I have a text output from a terminal program which reads data from a PID controller as shown below. How do I take the relevant data terms from the text and properly place them into respective arrays? Relevant data is essentially each numerical value

LOW FUEL EMPTY: 0 LOW FUEL UV: 217285
ERROR CODE: 0
selectiveModeSelect: 0
Set: 2322-210 = 2112 TempC: 179 StartTempC: 3 MaxTempC: 228 UserInputC: 0
adjusted_temp_c_display: 1935
StartTempC: 3 MaxTempC: 228 UserInputC: 0
blockNewSetpoints: 0
FlameStarted: 1
temp_threshold_reached: 1 ThresholdC: 183
Shutdown State 0 Duration 470/480
Glow plug: 0 Glow plug cycles: 1
temperature_reached: 1 temp_treshold_reached 1
Auger PWM: 128/255 RPM: 143 CCW: 1
AugerMaxReady 1
AugerReversed 0
Fan PWM: 255 RPM: 3780
PB: 60 Tu: 360 TablePtr: 42
P: -45
I: 756
D: -15
u: 695

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Nicholas Kavouris 2022-3-10

在 MATLAB Online 中打开

FID=fopen('File_name','w');
A=fscanf(FID,'%c');
fclose(FID);
Kp=regexp(A,'P:[+-]?\d+','match');
P=str2double(Kp)

So to begin would code look something similar? unsure of of the expression term as all values will be integers

Walter Roberson 2022-3-10

在 MATLAB Online 中打开

FID=fopen('File_name','w');

That would ask to creat a new file named File_name or erase the content of an existing file with that name.

The file would be empty, and fscanf() would produce no data.

I suggest you consider fileread() or readlines()

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Answer 1

Gagan Agarwal 2023-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1668079-extract-data-from-txt-file#answer_1354002

Hi Nicholas

I understand that you are trying to numerical value from a text file. This can be achieved by using 'regexp' function of MATLAB . This function is helpful for extracting specific patterns from text data, including the numerical values.

For additional information regarding 'regexp' function please refer to the following documentation:

https://www.mathworks.com/help/matlab/ref/regexp.html

I hope it helps!