Pressure Gradient Vector?
 

Hello, I am wondering if there is an easier way to determine the pressure gradient vector for every node (2-D, unstrucuted, shockwave simulation) other than exporting the pressure values at every x & y location and trying to match them up? I also tried to use the "dp/dx" function to plot it, but it only shows me zeros.

Any help you could give me would be greatly appreciated. Thanks for your time!