Extract Text From Nastran f06 file

Hi all,

I am looking to extract specific data from a Nastran f06 file (it opens as a text file in Notepad++).

What I want to do:

1- Locate the title "MODAL PARTICIPATION FACTORS" (here in the example it is at lign 37, but will vary depending on the analysis... therefore why I want to locate the title).

2- Locate the end of the table. It ends with a blank entry followed by a "Total" header. (here in the example at lign 254)

3- Extract all the data into one matrix. It starts 5 entry lines after the "Participation Factors" title, this is a fixed feature in all .f06 analysis. So here it would be a 211x8 type of matrix. The columns being "Mode N°" "Frequency" "T1" .. to .."R3"

Would you guys have any idea how to do this? Thanks in advance. I attach the file to this post.

Nicolas

Answer 1

[KSSV]

fid = fopen('NASTRAN_file.txt') ;

S = textscan(fid,'%s','delimiter','\n') ;
S = S{1} ; 
fclose(fid) ;
str1 = 'MODAL PARTICIPATION FACTORS' ; 
str2 = 'TOTAL' ;

idx1 = find(contains(S,str1)) 
idx2 = find(contains(S,str2))

[Nicolas Jalbert]

Hi,

I tested your script and there is a problem with it.

I am trying to extract only the table containing the values contained between "Modal participation factor" and "Total":

The first line of the matrix should be: "1 1.735054E+01 -2.287119E+01 3.381778E+00 1.736760E-01 -1.151308E+01 -7.373848E+01 -1.820687E+00"

contuining until the last data line:

"211 1.798900E+02 -2.958473E-01 -7.115342E-02 3.868792E-01 2.572267E-02 6.401150E-02 7.354217E-02"

In the script you gave me, it extracts all the text file into one cell S. Thanks, Nicolas

[KSSV]

It extracts all the data and, you got indices of the lines you want....from there you can extract what you want.

[Nicolas Jalbert]

Yes I do get that, however in a normal analysis, the file is tens of thousands of lines long... here I reduced it for the sake of the example. I'm really looking for a flexible and robust code to extract the data based on key words.

Thanks for your answer though, it does work !

[KSSV]

That way also can be done....will answer tomorrow from office if no one answers.

[Nicolas Jalbert]

Thanks that would be great! An other problem I have now is that even after cell2mat for a specific line of data, there is no division between the values.. therefore I can't manipulate them or use them in specific operations afterwards.

I'm trying to figure out a way

[KSSV]

fid = fopen('NASTRAN_file.txt','r') ;

tline = fgetl(fid);
iwant = zeros([],8) ;
count = 0 ;
while ischar(tline)    
    tline = fgetl(fid);
    if ~isempty(str2num(tline))
        count = count+1 ;
        iwant(count,:) = str2num(tline) ;
    end
    if contains(tline,'TOTAL')
        break
    end
end

fclose(fid) ;