R - Warning message: “In cor(…): the standard deviation is zero”

Question

I have a single vector of flow data (29 data) and a 3D matrix data(360*180*29)

i want to find the correlation between single vector and 3D vector. The correlation matrix

Answer 1

The following uses library("psych")

partial.r(sd,c("GPA","SAT"),"GRADE1",use = "complete.obs")
Warning Message:
 In cor(data, use = use, method = method) : the standard deviation is zero

sd contains NA for SAT.

partial.r(subset,c("GPA","SAT"),"GRADE1", use = "complete.obs")
no warnings

subset has NA's removed