How do you apply the covariance reducer to an array in Earth Engine? I have two lists containing values that I have sampled from an image and would like to calculate their covariance matrix. My attempt is
a1 = ee.Array([1,2,3,4,5])
a2 = ee.Array([5,4,3,2,1])
cov = ee.Array.cat([a1, a2], 1).tranpose() \
.reduce(reducer = ee.Reducer.covariance(), axes = [0])
which would return
Array.reduce: Type must be a 1D EEArray.