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Edit txt file and create new files

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Ellen Robson
Ellen Robson on 10 Dec 2020
Commented: Rik on 22 Dec 2020
I have a large txt file that is NOT in rows and columns (see attached).
In the file, it outlines values for various parameters:
num: 1 gsi: 21.8 mi: 7 disturbance: 0 use_gsi_mi_d: 1
num: 2 gsi: 1 mi: 5 disturbance: 0.1 use_gsi_mi_d: 1
num: 3 gsi: 2 mi: 6 disturbance: 0.2 use_gsi_mi_d: 1
num: 4 gsi: 3 mi: 7 disturbance: 0.3 use_gsi_mi_d: 1
num: 5 gsi: 4 mi: 8 disturbance: 0.4 use_gsi_mi_d: 1
I want to create 1000 versions of this txt file and with these values changed in each. The parameter values will be loaded into MATLAB as vectors.
How can I do this?
  1 Comment
Rik on 10 Dec 2020
It is very difficult to edit files by code, but very easy to overwrite them. So if it is possible to hold a file in memory, you can load it to a Matlab variable, make the edit, and write out.
Did you try that?

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Answers (1)

Madhav Thakker
Madhav Thakker on 22 Dec 2020
+1 to Rik's comment. It is easier to edit files by code.
You can read the entire text file using fileread and read the parameters separately using readtable. You can then modify the values in the table and writeout.
Hope this helps.
  1 Comment
Rik on 22 Dec 2020
Instead of fileread I would suggest readlines, or my readfile function from the FEX (which will also work pre-R2020b).

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