Localize the third vector position using regexp

2 views (last 30 days)
Hello everyone,
I am analyzing some data files in a loop, which look like this:
#------------------------------------------------------
# Atomistic spin configuration file for vampire v5+
#------------------------------------------------------
# Date: Thu Dec 21 02:16:27 2023
#------------------------------------------------------
Time: 1e-10
Field: -0 -0 -3
Temperature: 0
Magnetisation: 0.0276355 0.000325712 -0.999618
#------------------------------------------------------
Number of spin files: 1
spins-00000000.data
In particular, I am interested in the information localized after "Field:", which has the form of a three-dimensional vector (-0,-0,-3). I want to be able to have access to the third component of this vector, "-3". If I use:
field_str=regexp(meta_file_read,'(?<=^Field:\s+)\S+','match','lineanchors');
I am able to obtain the information localized in the first component of the field vector, "-0". Is there an efficient way to access the third component of the field vector using regexp?

Accepted Answer

Stephen23
Stephen23 on 23 Dec 2023
txt = fileread('test.txt')
txt =
'#------------------------------------------------------ # Atomistic spin configuration file for vampire v5+ #------------------------------------------------------ # Date: Thu Dec 21 02:16:27 2023 #------------------------------------------------------ Time: 1e-10 Field: -0 -0 -3 Temperature: 0 Magnetisation: 0.0276355 0.000325712 -0.999618 #------------------------------------------------------ Number of spin files: 1 spins-00000000.data'
rgx = '(?<=Field(\S+\s+){3})\S+';
out = regexp(txt,rgx,'once','match')
out = '-3'

More Answers (0)

Categories

Find more on Loops and Conditional Statements in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!