I would to save the values for post processing from file output, can you help me?
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I have a file .txt which i would to obtain the values for post processing. For this in Matlab i am using:
outputfile=fopen(postproces.dat,'r');
But the file have this line:
fan= 30.000 bes = 2.3700 doe = 15.490
and i would to catch 2.3700 and save it into a variabile bes in Matlab. Thanks.
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采纳的回答
per isakson
2019-5-5
编辑:per isakson
2019-5-7
Try this
>> num = cssm('h:\m\cssm\postprocessing.txt')
num =
3.15
where the file, cssm.m, contains the following code
function num = cssm( ffs )
str = fileread( ffs );
xpr = '(?<=Cref\s*=\s*)[0-9.]+';
cac = regexp( str, xpr, 'match', 'once' );
num = str2double( cac );
end
2017-05-07: There is an issue with this regular expression, '(?<=Cref\s*=\s*)[0-9.]+'. It matches the value following any word that ends with the string, Cref, e.g. xyzCref. Thus, add the beginning of word anchor, \<, so that the expression reads '(?<=\<Cref\s*=\s*)[0-9.]+'.
Version 2.0
>> num = cssm('h:\m\cssm\postprocessing.txt',{'Sref','Cref','Bref'})
num =
30 3.15 10.95
where
function num = cssm( ffs, names )
narginchk(1,2)
if nargin == 1
names = {'Cref'};
else
if isa( names, 'char' )
names = {names};
elseif not( iscellstr( names ) )
error('The second input argument, "%s", has wrong type')
end
end
str = fileread( ffs );
len = length( names );
num = nan( size( names ) );
for jj = 1 : len
xpr = ['(?<=\<', names{jj}, '\s*=\s*)[0-9.]+'];
cac = regexp( str, xpr, 'match', 'once' );
num(jj) = str2double( cac );
end
end
2 个评论
per isakson
2019-5-22
编辑:per isakson
2019-5-23
What's "value is negative" and what's "appears NaN" ?
更多回答(1 个)
Image Analyst
2019-5-4
You can probably use csvread(), dlmread(), readtable(), importdata(), textscan(), or fgetl(). (Just one of those functions of course!)
If none of those work, attach 'postproces.dat' so we can figure it out for you.
4 个评论
per isakson
2019-5-5
编辑:per isakson
2019-5-5
Your file, postprocessing.txt, looks like this
---------------------------------------------------------------
Vortex Lattice Output -- Total Forces
Configuration: ALA ANALISI lambda0.2-massa 2000kg-AR 4
# Surfaces = 2
# Strips = 40
# Vortices = 240
Sref = 30.000 Cref = 3.1500 Bref = 10.950
Xref = 0.0000 Yref = 0.0000 Zref = 0.0000
CDvis = 0.00000 CDind = 0.1076431
Do the files always have 12 lines and this format?
What about the line, fan= 30.000 bes = 2.3700 doe = 15.490 , of your question?
Do you want to capture only the value of Cref ?
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