How to use fvtool when you have a magnitude array (in dB) and a phase array?

Hello, I am trying to measure the impulse response of a system by using sines and cosines. I was able to obtain the magnitude and the phase response of the system in two different arrays (magArray and phaseArray) and I am trying to display these results along with a filter created with the fdesign command. My problem is that fvtool only accepts coefficients, and I don't really have them. As I mentioned before, I only have those two arrays. Is there any way to display both responses with fvtool?