Save numbers after text pattern in a vector

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Roderick
Roderick 2024-8-2
回答： Rik 2024-8-2
Dear all
I have a text file that looks like these:
#------------------------------------------------------
# Atomistic spin configuration file for vampire v5+
#------------------------------------------------------
# Date: Wed Jul 31 19:19:54 2024
#------------------------------------------------------
Time: 1e-15
Field: 0 0 0
Temperature: 0.05
Magnetisation: -0.999883 0.0152572 -0.000478932
#------------------------------------------------------
Number of spin files: 1
spins-00000000.data
#------------------------------------------------------
I am interested in saving in an array the three numerical values after "Field:". I have tried something like
field_str=regexp(meta_file_read,'(?<=^TField:\s+)(\S+)\s*(\S+)\s*(\S+)','match','lineanchors'); % T
But the cell seems to be empty.
Any ideas?

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回答（1 个）

Rik
Rik 2024-8-2
Ran in:
Having a typo in your needlessly complicated regex doesn't help:
meta_file_read=["#------------------------------------------------------"
"Time: 1e-15"
"Field: 0 0 0"
"Temperature: 0.05"
"Magnetisation: -0.999883 0.0152572 -0.000478932"
"#------------------------------------------------------"];
[field_str,tokens]=regexp(meta_file_read,...
'^Field:\s+(\S+)\s*(\S+)\s*(\S+)',...
'match','tokens')
field_str = 6x1 cell array
{0x0 string } {0x0 string } {["Field: 0->0->0"]} {0x0 string } {0x0 string } {0x0 string }
tokens = 6x1 cell array
{0x0 string} {0x0 string} {1x1 cell } {0x0 string} {0x0 string} {0x0 string}
tokens{3}{1}
ans = 1x3 string array
"0" "0" "0"

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