fix: sign failure on impedance calculation

6 years ago · af17abd053
parent d3396604e5
commit af17abd053
1 changed files with 1 additions and 1 deletions
--- a/plot.c
+++ b/plot.c
@ -571,7 +571,7 @@ gamma2imp(char *buf, int len, const float coeff[2], uint32_t frequency)
  // z = (gamma+1)/(gamma-1) * z0
  float z0 = 50;
  float d = z0 / ((1-coeff[0])*(1-coeff[0])+coeff[1]*coeff[1]);
-  float zr = ((1+coeff[0])*(1-coeff[0]) + coeff[1]*coeff[1]) * d;
+  float zr = ((1+coeff[0])*(1-coeff[0]) - coeff[1]*coeff[1]) * d;
  float zi = 2*coeff[1] * d;
  int n;