void MainWidgetTFM::initTextures()
{
// Read CSV file
std::ifstream ifile(filename);
std::string line;
// x is current receiving element
// t is current time sample
// p is current pulsing element
int x = 0, t = 0, p = 0;
if (ifile.is_open()){
double tmp;
while(ifile >> tmp){
if(t % 100 == 0)
qDebug() << "Reading CSV: " << (float)t * 100.0 / sampleSize << "%";
//std::cout << "temp: " << tmp << std::endl;
m_data[index3d(t,x,p)] = tmp; // (fabs(tmp));
//std::cout << "m_data: " << m_data[x][t] << std::endl;
x++;
for (int j = 1; j < numElements; j++) {
ifile >> tmp;
m_data[index3d(t,x,p)] = tmp; // fabs(tmp);
//m_data[x][t] = (uchar)255;
x++;
}
p++;
x = 0;
for(int i = 1; i < numElements; i++){
for (int j = 0; j < numElements; j++) {
ifile >> tmp;
m_data[index3d(t,x,p)] = tmp; // fabs(tmp);
//m_data[x][t] = (uchar)255;
x++;
}
x = 0;
p++;
}
x = 0;
p = 0;
t++;
}
ifile.close();
}
void mexFunction(int lhsCount, mxArray* lhs[], int rhsCount, const mxArray* rhs[])
{
mxArray* pi_R;
unsigned int* pi_R_data;
unsigned int* pi_R_j_data;
unsigned int pi_R_j_idx;
unsigned int* inv_pi = (unsigned int*)mxGetData(rhs[0]);
size_t max_t = mxGetM(rhs[0]);
size_t N = mxGetN(rhs[0]);
unsigned int* t = (unsigned int*)mxGetData(rhs[1]);
unsigned int n = (unsigned int)mxGetScalar(rhs[2]);
char* already_ranked = mxMalloc(n * sizeof(char));
unsigned int* this_inv_pi;
unsigned int i, j, k;
unsigned int row;
mwSize dims[3];
dims[0] = n - 1;
dims[1] = max_t;
dims[2] = N;
pi_R = mxCreateNumericArray(3, dims, mxUINT32_CLASS, mxREAL);
pi_R_data = (unsigned int*)mxGetData(pi_R);
lhs[0] = pi_R;
for (i = 0; i < N; ++i)
{
this_inv_pi = inv_pi + index2d(0, max_t, i);
memset(already_ranked, 0, n * sizeof(char));
for (j = 0; j < t[i]; ++j)
{
/* Get this sparse vector of R */
pi_R_j_data = pi_R_data + index3d(0, n - 1, j, max_t, i);
pi_R_j_idx = 0;
/* Fill vector with proper entries */
/* Only row will be inv_pi[j] */
row = this_inv_pi[j];
already_ranked[row] = 1;
for (k = 0; k < n; ++k)
{
/* If not already ranked, and not current item being ranked, mark in vector */
if (already_ranked[k] == 0)
{
pi_R_j_data[pi_R_j_idx++] = k * n + row;
}
}
assert(pi_R_j_idx == n - j - 1);
}
}
mxFree(already_ranked);
}
void MainWidgetTFM::filterFFT(){
for (int pulsing = 0; pulsing < numElements; pulsing++) {
if(pulsing % 10 == 0)
qDebug() << "filtering: " << ((float)pulsing) * 100.0/((float)numElements) << "%";
for (int element = 0; element < numElements; element++) {
// copy the array to fftw_complex structure, could be a faster way e.g. memcpy
for (int i = 0; i < sampleSize; i++) {
in[i][0] = m_data[index3d(i,element,pulsing)];
in[i][1] = 0;
}
//for (int i = 0; i < 100; i++) std::cout << i << ": " << in[i][0] << std::endl;
/* FFT */
fftw_plan my_plan = fftw_plan_dft_1d(sampleSize, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
fftw_execute(my_plan);
for (int i = 0; i < sampleSize; i++) {
out[i][0] /= (float)sampleSize;
out[i][1] /= (float)sampleSize;
//std::cout << i << ": " << out[i][0] << " , " << out[i][1] << "i" << std::endl;
}
for (int i = 0; i < sampleSize; i++) {
//magnitude[i] = sqrt(out[i][0]*out[i][0] + out[i][1]*out[i][1]);
//std::cout << i << ": " << magnitude[i] << std::endl;
//outfile << to_string(magnitude[i]) << endl;
}
//int peak_frequency = 0;
//double peak_val = 0.0;
//for(int i = 0; i < 500; i++){
// //std::cout << i << ": " << magnitude[i] << std::endl;
// if(magnitude[i] > peak_val){
// std::cout << "new peak : " << i << std::endl;
// peak_val = magnitude[i];
// peak_frequency = i;
// }
//}
//std::cout << "peak_frequency(index) : " << peak_frequency << std::endl;
//float time_period = 1.0 / peak_frequency;
fftw_destroy_plan(my_plan);
/* FILTERING */
// Create gaussian filter vector
// f(x; sig, c) = e ^ ( -(x-c)^2 / 2*sig^2 )
//float sigma, c;
//createGaussian(70, 200);
createGaussian();
double weight = 2.0;
for (int i = 0; i < sampleSize; i++) {
out[i][0] = out[i][0] * gaussFilter[i] * weight;
out[i][1] = out[i][1] * gaussFilter[i] * weight;
}
for (int i = 500; i < sampleSize; i++) {
//out[i][0] = 0.0;
//out[i][1] = 0.0;
}
/* INVERSE FFT */
// To check that there's no existing data
for (int i = 0; i < sampleSize; i++) {
in[i][0] = 0;
in[i][1] = 0;
}
my_plan = fftw_plan_dft_1d(sampleSize, out, in, FFTW_BACKWARD, FFTW_ESTIMATE);
fftw_execute(my_plan);
//for (int i = 0; i < 100; i++) std::cout << i << ": " << in[i][0] << std::endl;
//for (int i = 0; i < sampleSize; i++) std::cout << i << ": " << in[i][0] << " , " << in[i][1] << "i" << std::endl;
fftw_destroy_plan(my_plan);
// multiply output by 2 (why?)
for (int i = 0; i < sampleSize; i++) {
in[i][0] *= 2.0;
in[i][1] *= 2.0;
//qDebug() << in[i][0];
//qDebug() << in[i][1];
}
// Calc absolute value and put back into array
for (int i = 0; i < sampleSize; i++) {
//m_filtered_data_ri[element][i][0] = (in[i][0]);//(float)
//m_filtered_data_ri[element][i][1] = (in[i][1]);//(float)
m_filtered_data_ri[index3d(i,element,pulsing)*2] = (in[i][0]);//(float)
m_filtered_data_ri[index3d(i,element,pulsing)*2+1] = (in[i][1]);//(float)
}
}
}
// calculate in seconds, using sampling rate
//time_period = time_period / samplingRate;
//std::cout << "test" << std::endl;
//float frequency = 1 / time_period;
//std::cout << "peak frequency : " << frequency << std::endl;
}