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Return NA if either sd in the denominator is 0. #2

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Return NA if either sd in the denominator is 0. #2

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507130b
Return NA if either sd in the denominator is 0.
chinandrew Sep 13, 2023
9e4de88
Align return statement format with previous code
chinandrew Sep 13, 2023
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12 changes: 10 additions & 2 deletions src/sliding_cor_c.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,10 @@ NumericVector sliding_cor_c(NumericVector shortvec, NumericVector longvec, doubl
int n = shortvec.size();
int n_minus1 = n - 1;
int out_length = length_longvec - n_minus1;
if (sd_shortvec < sqrt(DBL_EPSILON)) {
NumericVector out(out_length, NA_REAL);
return out;
}
NumericVector out(out_length);

// Calculate constant term to multiply all
Expand Down Expand Up @@ -37,7 +41,11 @@ NumericVector sliding_cor_c(NumericVector shortvec, NumericVector longvec, doubl
ss_longvec_current += pow(longvec_current_b - mean_longvec_current, 2);
}
double sd_longvec_current = sqrt(ss_longvec_current / n_minus1);
out[a] = (sum_products / n_minus1 - sum_longvec_current * term2) / sd_shortvec / sd_longvec_current;
if (sd_longvec_current < sqrt(DBL_EPSILON)) {
out[a] = NA_REAL;
} else {
out[a] = (sum_products / n_minus1 - sum_longvec_current * term2) / sd_shortvec / sd_longvec_current;
}
}
return out;
}
}