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I'm trying to implement the multiplication of two matrices something like this picture in c langage. enter image description here

I want to read the numbers from a text file of x and store it later in an array the code that i tried is below
So the problem that I have is when i use the static method Complex x[4] = { { 1,0 },{ 0,-1 },{ 1,1 },{ 4,-1 } }; it's work but when i want to read it from input.txt Complex x[4] it does not work what i missed.

typedef struct Complex
{
    double real;
    double image;
}Complex;

int main()
{
   Complex x[4] = { { 1,0 },{ 0,-1 },{ 1,1 },{ 4,-1 } };
   Complex y[4] = { { 0,1 },{ 1,-1 },{ 2,-3 },{ 4,0 } };
   FILE *input;
   input = fopen("input.txt", "r");
   if (sensorInput == NULL ) {
        printf(stderr, "Cannot open file\n");
        return 1;
    }
    else {
        for (i = 0; i<4; ++i)
        {
                fscanf(sensorInput, "%lf + j*%lf\t", &x[i]); 
                printf("\n");
        }
    }

}

input.txt
1,0
0,-1
1,1
4,-1

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  • $\begingroup$ There are matrix manipulation packages for C, C++, FORTRAN, Python and Rust -- and those are just the ones that I know about. They handle input/output, math, linear algebra, etc., etc.. $\endgroup$ – TimWescott Mar 19 at 16:15
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The line

                fscanf(sensorInput, "%lf + j*%lf\t", &x[i]); 

should be

                fscanf(sensorInput, "%lf,%lf\t", &x[i].real, &x[i].imag); 

Notice that C++ provides complex type, they support the common complex operations, and provide an io, and they can read complex numbers writen as (1,3) directly file_in >> x[i], once you have a istream

Note that this type of question you should ask in stackoverflow instead.

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