read the first 3 lines of a file and extract variables without reading the rest

Hello,

I have a file "toread.txt" have following lines,

Profile=" time=          0.123456 "
 VARIABLES = "X" "Y" "Z"
Z="XY" X=  10,Y=  10,
   0.00000   0.00000  0.00000E+00
   0.01953   0.00000  0.00000E+00

How could I read and extract the first three variables, t = 0.123456, X = 10, and Y = 10, without reading the rest of the document?

Thanks!

Answer 1

[KSSV]

fid = fopen('file.txt');

tline = fgetl(fid);
val = cell(3,1) ; 
n = 1 ;
val{n} = str2double(regexprep(tline, {'\D*([\d\.]+\d)[^\d]*', '[^\d\.]*'}, {'$1 ', ' '} ) ) ;
while ischar(tline)
    disp(tline)
    tline = fgetl(fid) ;    
    n = n+1 ;
    val{n} = str2double(regexprep(tline, {'\D*([\d\.]+\d)[^\d]*', '[^\d\.]*'}, {'$1 ', ' '} ) ) ;
    if n == 3
        break
    end        
end
fclose(fid);
celldisp(val)

[Lei Zeng]

Thank you!