x=[-22.7821 -17.1353 -14.3801 -12.9896 -12.3508 -12.1263 -12.1139 -12.1887 -12.2745 -12.3275 -12.3275 -12.2745 -12.1887 -12.1139 -12.1263 -12.3508 -12.9896 -14.3801 -17.1353 -22.7821];
 y=[23.75 21.25 18.75 16.25 13.75 11.25 8.75 6.25 3.75 1.25 -1.25 -3.75 -6.25 -8.75 -11.25 -13.75 -16.25 -18.75 -21.25 -23.75];
 z=[-50.0002 -46.6625 -43.4104 -40.5584 -38.1791 -36.2663 -34.7894 -33.7148 -33.0146 -32.6695 -32.6695 -33.0146 -33.7148 -34.7894 -36.2663 -38.1791 -40.5584 -43.4104 -46.6625 -50.0002];
出来的是一个曲面，但是我需要这些点由未知函数变为已知函数，用matlab可以实现么？