How do I merge scalar arrays into vector array if each component is loaded into separate block? VX*iHat + VY*jHat + VZ*kHat expression from FAQ does not produce any output and does not throw any errors in this case (expressions like VX*iHat + 0*jHat + 0*kHat or VX*iHat + VX*jHat + 0*kHat work just fine).