How can i replace several lines in the same .txt file using "strrep" command?

I'm trying to read a txt file (MaterialiprovaRFR.tcl), create a copy of it but replacing 4 strings in the modified copy ((Materialiprova.tcl) using the command "strrep". Once excecuted the code, the result is not what i expect. In fact, opening the generated new file "Materialiprova.tcl" i read the same line of the original .txt file four times, i.e :

-----Core concrete (confined)

-----Core concrete (confined)

-----Core concrete (confined)

-----Core concrete (confined)

uniaxialMaterial Concrete01 1 16.36 0.002 3.27 0.005

uniaxialMaterial Concrete01 1 16.36 0.002 3.27 0.005

uniaxialMaterial Concrete01 1 16.36 0.002 3.27 0.005

uniaxialMaterial Concrete01 1 16.36 0.002 3.27 0.005

...................................................

The following is part of my code:

       fid = fopen('C:\Users\Ro\Desktop\Folder\MaterialiprovaRFR.tcl','r'); %read the original-reference file

       fid2 = fopen('C:\Users\Ro\Desktop\Folder\Materialiprova.tcl','wt+'); %create a copy of the previous file in       which operate some (4) substitutions of lines.....................................................................
.............................................................................................................
.........................................................
................................................

       while ~feof(fid)

              a= fgetl(fid);

      ......................

      .....................

      oldrows=[stringapil1RFR,stringapil2RFR,stringapil3RFR,stringapil4RFR];
      newrows=[strpil1,strpil2,strpil3,strpil4];

            for i=1:nvar

      substitution=strrep(a, oldrows(i), newrows(i)); 

      fwrite(fid2,[substitution double(sprintf('\n'))]); 

           end

      end

   fclose(fid);

   fclose(fid2);

i would expect to read in the created Materialiprova.tcl file, a copy of all the strings of the original file with the exception of :

newrows (for example, becouse the last two numbers appearing in each string are calculate by a random procedure)=

uniaxialMaterial Concrete01 1 16 0.002 23.4133 0.0076142

uniaxialMaterial Concrete01 2 16 0.002 20.6701 0.0064092

uniaxialMaterial Concrete01 3 16 0.002 23.4133 0.0076142

uniaxialMaterial Concrete01 4 16 0.002 25.7142 0.0085388

in place of the following lines contained in MaterialiprovaRFR.tcl

oldrows =

uniaxialMaterial Concrete01 1 16 0.002 25.7142 0.0085388

uniaxialMaterial Concrete01 2 16 0.002 25.7142 0.0085388

uniaxialMaterial Concrete01 3 16 0.002 25.7142 0.0085388

uniaxialMaterial Concrete01 4 16 0.002 25.7142 0.0085388

I tryed to employ the "cellfun" command before of recalling "strrep" but Matlab show me a worning. can someone help me? Thanks

[Azzi Abdelmalek]

Just to make things clear, give a short example and the expected result.

[Roberto Falcone]

I want to find the following lines (that are not present in sequence so as reported here) in MaterialiprovaRFR.tcl :

uniaxialMaterial Concrete01 1 16.36 0.002 3.27 0.005

uniaxialMaterial Concrete01 2 16.36 0.002 3.27 0.005

uniaxialMaterial Concrete01 3 16.36 0.002 3.27 0.005

uniaxialMaterial Concrete01 4 16.36 0.002 3.27 0.005

substitute them with 4 new ones and save the changed lines (together with the unchanged ones) in a copy of the file "MaterialiprovaRFR.tcl", named "Materialiprova.tcl". This last file should have the same strings of its original version with the exception of four new lines (which i cannot report here becousethe last two numbers are not fixed becouse they depend on genetic operator)

But just as an example i wrote :

uniaxialMaterial Concrete01 1 16 0.002 23.4133 0.0076142

uniaxialMaterial Concrete01 2 16 0.002 20.6701 0.0064092

uniaxialMaterial Concrete01 3 16 0.002 23.4133 0.0076142

uniaxialMaterial Concrete01 4 16 0.002 25.7142 0.0085388

The syntax of "strrep" command is :

modifiedStr = strrep(origStr, oldSubstr, newSubstr)

Is there a way to use the "strrep" command several times

oldSubstr1------> newSubstr1

oldSubstr2------> newSubstr2

oldSubstr3------> newSubstr3

oldSubstr4------> newSubstr4

within the same "origStr" and then print all in a single txt file?

Is it clearer now? Thanks