Java 10, 84 74 bytes

a->b->{float A=0,B=0;int i=0;for(var t:b){A+=a[i++]*t;B+=t*t;}return A/B;}

#Java 10, 84 74 bytes

a->b->{float A=0,B=0;int i=0;for(var t:b){A+=a[i++]*t;B+=t*t;}return A/B;}

a->b->{float A=0,B=0;int i=0;for(var t:b){A+=a[i++]*t;B+=t*t;}return A/B;}

deleted 7 characters in body

Source Link

edited Jun 10, 2020 at 14:25

#Java 810, 8484 74 bytes

a->b->{float A=0,B=0;forB=0;int i=0;for(intvar i=a.length;i-->0;B+=b[i]*b[i]t:b)A+=a[i]*b[i];return{A+=a[i++]*t;B+=t*t;}return A/B;}

#Java 8, 84 bytes

a->b->{float A=0,B=0;for(int i=a.length;i-->0;B+=b[i]*b[i])A+=a[i]*b[i];return A/B;}

#Java 10, 84 74 bytes

a->b->{float A=0,B=0;int i=0;for(var t:b){A+=a[i++]*t;B+=t*t;}return A/B;}

Source Link

created Jun 10, 2020 at 14:19

#Java 8, 84 bytes

a->b->{float A=0,B=0;for(int i=a.length;i-->0;B+=b[i]*b[i])A+=a[i]*b[i];return A/B;}

Return to Answer