I would like to solve an equation (A*x=b) with Matlab in my iOS app. I generated the C source files and added them to Xcode. The strange thing is that for the same (A,b), I get different results in Matlab and in Xcode.
I use the default settings. Any suggestion?
Matlab:
%#codegen
function X = solveEquation(A, B)
X = linsolve(A,B);
end
Xcode:
double* A_data = malloc(num * num * sizeof(double));
double* B_data = malloc(num * sizeof(double));
for (int i=0; i<num; i++) {
for (int j=0; j<num; j++) {
double sum = 0.0;
for (int k=0; k<9; k++) {
double diff = powf(A[i][k]-A[j][k],2);
sum += diff;
}
A_data[j*num+i] = exp(sum/-2);
}
B_data[i] = A[i][9];
}
int A_sizes[] = {num, num};
int B_sizes[] = {num, 1};
double* X_data = malloc(num * sizeof(double));
int X_sizes[] = {num, 1};
solveEquation(A_data, A_sizes, B_data, B_sizes, X_data, X_sizes);