# Thread: Read coefficients of linear equations from file into 2d array

1. ## Read coefficients of linear equations from file into 2d array

Hi,
I'm working on a program that reads linear equations from a file such as those:
Code:
```3x+2y-2.5z=9
-2x+9y+12z=23.4
4.2x-7y+9.6z=45.3```
The file is supposed to contain n equations with n variables which I would read into a 2d dynamic array of doubles and then I'm supposed to solve the resulting matrix using Gauss's method. I've already implemented Gauss's method but I can't figure out when reading from file how to get only the numbers and the signs for example from the above equations I'm supposed to have the following in the array:
Code:
```[+3][+2][-2.5]
[-2][+9][+12]
[+4.2][-7][+9.6]```
I need the numbers after the equal sign to be stored in a separate n sized array as well.

If anyone has any ideas I'd really appreciate it

2. Let me look at your code. Else, I'd suggest you to use formatted input.

3. What part of the code exactly? It's too large and most if not all of it is irrelevant to this remaining part.
I just need to read double by double until I reach the equal sign and store the double after it in a n sized array for solutions and when a new line starts I'd move to the next row in the 2d array and repeat the process. Is that possible?

Thanks for replying

4. If you're sure the input is all correct, ol' fscanf might help you. Or read "double - char - double - char - char - double" (something like this).

5. If I don't know the number of variable but can calculate it once I read the file, can I just loop reading one double and one char for the number of variables without moving to the next line until I pass the = sign?

6. Read a double, then a char, then an operator. Keep doing until the operator is '='. The number of variables is the number of times you did that. Read another double. You have everything you need.

7. All right then Thank you very much for your help

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