IDL dot product function ‘ dot_product ‘ needs manual installation:
“install via package manager ” (at IDL prompt):
ipm, /install, ‘https://github.com/csalvaggio/IDL_RIT_Salvaggio’
Note that the dot product can be created from native IDL functions as follows :
From rnsprobmapcorner.pro :
TRANSPOSE(A) # B COMPUTES THE DOT PRODUCT OF A AND B.
Note the ‘ # ‘ operator
( See https://www.nv5geospatialsoftware.com/docs/Manipulating_Arrays.html )