How to delete a set of numbers in the end of nth text file ?

i have part of the following text file

 *Nset, nset=RM1STIFF, instance=Part-1-1
  13,  14, 533, 534, 535, 536, 537, 661, 662, 663, 664, 665, 666, 667
  *Nset, nset=RMSTIFF2, instance=Part-1-1
   25,   26,  959,  960,  961,  962,  963, 1087, 1088, 1089, 1090, 1091, 1092, 1093
 *Nset, nset=LMSTIFF1, instance=Part-1-1
  17,  18, 675, 676, 677, 678, 679, 803, 804, 805, 806, 807, 808, 809
*Nset, nset=LMSTIFF2, instance=Part-1-1
  21,  22, 817, 818, 819, 820, 821, 945, 946, 947, 948, 949, 950, 951
*Nset, nset=RSNODES, instance=Part-2-1
   8,   9,  12, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352,353, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517

for a specific line i would like to delete set of numbers(2 numbers) and print it to a new file then delete more numbers (4 numbers) and print it to another new file, etc, any help to do that

[dpb]

Are the numeric values on single record or is the linewrap a figment of the display? Is there some auxiliary data that informs the number of elements in each section?

How do you know which line(s) to modify and which values within the lines to change (and to what)?

Basically, the thing with sequential files is that they're, well, "sequential". Which means basically, start a loop, read a line, process it, write the new line, rinse, and repeat until feof().

[Eltigani hamad]

this is an input file for other software i want to link it with matlab so the first input file i would like to delete let say 516, 517. next input file, 514, 515, 516 517 and so on

Answer 1

[Mohammad Abouali]

So read the numbers in an array

numberArray=myreadingfunction(...);

then filter those that you don't want Lets say your condition to delete a number is if it is larger than 500 but smaller than 550.

mask= (numberArray>500 & numberArray<550);

now remove them from number Array:

numberArray=numberArray(~mask);

Now write this to a file.

We don't know what is your criteria to remove a number so that part you would know.