MATLAB: Code to read files from ansys fluent and perform calculations

read a .txt file and solve the equation

hello expert,

Am new to matlab. please i need help on how to generate a code that would claculate this equation.

D = C x P ^a x t^b

the vaues of a, b, c are constants with values c =3.62e-7; a =2.416; b = 0.785

the values of P and t are in a .txt file output in columns as attached. t represent time and p represent stress.

please your guidance will help alot

best regards,

Best Answer

Read about textscan.

fid = fopen('Myfile.txt','r') ; 
S = textscan(fid,'%f %f\n','HeaderLines',4) ; 
S = S{1} ; 
fclose(fid) ;

S should be a n*2 matrix. Read baout textscan if the code is not working properly.

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d=[];  % initialize an array for the data
fmt=repmat('%f',1,14);  % format string to match file
fid=fopen('filename');
for i=1:10
  d=[d;cell2mat(textscan(fid,fmt,12,'headerlines',2,  ...
                                    'collectoutput',1 ...
                                    'delimiter',','))]; % read each section;concatenate
  fgetl(fid)  % had to do this to get synchronized again...find it often
end
fid=fclose(fid);

The above returns the data in one array; if you instead want each simulation separately, instead of the concatenation above use a cell array to store each read section--

ERRATUM

fmt=[repmat('%f',1,14) '\n'];  % format string to match line of file data
fid=fopen('filename');
for i=1:10        % repeat for all sections in file
  d(i)=textscan(fid,fmt,12,'headerlines',2,  ...
                           'collectoutput',1 ...
                           'delimiter',',')]; % read each section into cell array
end
fid=fclose(fid);

NB: The \n (newline) in the format string solves the position in the file it seems. I guess it's one of those cases where it's probably technically wrong without it but the scanning routines skip over it transparently in the vectorized portion but not when the scan is started over. Again, "why" is indecipherable as far as I can tell, it "just is".

Best Answer

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