math: Avoid unneeded extra allocations for fixed-size data structures.

[pspp] / src / math / correlation.h

diff --git a/src/math/correlation.h b/src/math/correlation.h
index 27621c47c9c3219a63fdb71b3a9ad0e275074585..5771f43e71bda48b1a130e51a0f531321be2853e 100644 (file)
--- a/src/math/correlation.h
+++ b/src/math/correlation.h
@@ -20,7 +20,9 @@
 
 #include <gsl/gsl_matrix.h>
 
-gsl_matrix * correlation_from_covariance (const gsl_matrix *cv, const gsl_matrix *v);
+gsl_matrix *correlation_from_covariance (const gsl_matrix *cv, const gsl_matrix *v);
+
+gsl_matrix *covariance_from_correlation (const gsl_matrix *corr, const gsl_matrix *v);
 
 double significance_of_correlation (double rho, double w);