unsigned int *irows, int nrows, const float *ys1, unsigned long ny, float dy, float y_min)

{

int i, j, j_last;

unsigned int *rowstart = irows;

const float *ys2 = ys1 + 1;

const float *yl = ys1 + ny;

float yo = y_min + dy / 2.0f;

float ym = 0.5f * (*ys1 + *ys2);

// y/rows

j = 0;

j_last = j;

for (i = 0; i < nrows; i++, yo += dy, rowstart++) {

while (ys2 != yl && yo > ym) {

ys1 = ys2;

ys2 = ys1 + 1;

ym = 0.5f * (*ys1 + *ys2);

j++;

}

*rowstart = j - j_last;

j_last = j;

}

unsigned int *irows,

int nrows,

const float *y,

unsigned long ny,

float dy,

float y_min)

{

int i;

int ii = 0;

int iilast = (int)ny - 1;

float sc = 1 / dy;

int iy0 = (int)floor(sc * (y[ii] - y_min));

int iy1 = (int)floor(sc * (y[ii + 1] - y_min));

float invgap = 1.0f / (iy1 - iy0);

for (i = 0; i < nrows && i <= iy0; i++) {

irows[i] = 0;

arows[i] = 1.0;

}

for (; i < nrows; i++) {

while (i > iy1 && ii < iilast) {

ii++;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii + 1] - y_min));

invgap = 1.0f / (iy1 - iy0);

}

if (i >= iy0 && i <= iy1) {

irows[i] = ii;

arows[i] = (iy1 - i) * invgap;

} else

break;

}

for (; i < nrows; i++) {

irows[i] = iilast - 1;

arows[i] = 0.0;

}

{

int i;

if (sc * (y[ny - 1] - y[0]) > 0) {

int ii = 0;

int iilast = (int)ny - 1;

int iy0 = (int)floor(sc * (y[ii] - offs));

int iy1 = (int)floor(sc * (y[ii + 1] - offs));

for (i = 0; i < nrows && i < iy0; i++) {

irows[i] = -1;

}

for (; i < nrows; i++) {

while (i > iy1 && ii < iilast) {

ii++;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii + 1] - offs));

}

if (i >= iy0 && i <= iy1)

irows[i] = ii;

else

break;

}

for (; i < nrows; i++) {

irows[i] = -1;

}

} else {

int iilast = (int)ny - 1;

int ii = iilast;

int iy0 = (int)floor(sc * (y[ii] - offs));

int iy1 = (int)floor(sc * (y[ii - 1] - offs));

for (i = 0; i < nrows && i < iy0; i++) {

irows[i] = -1;

}

for (; i < nrows; i++) {

while (i > iy1 && ii > 1) {

ii--;

iy0 = iy1;

iy1 = (int)floor(sc * (y[ii - 1] - offs));

}

if (i >= iy0 && i <= iy1)

irows[i] = ii - 1;

else

break;

}

for (; i < nrows; i++) {

irows[i] = -1;

}

}