PIV实验结果流速矢量图、流线图 clear;clc; for k=1:n str1=['file position']; str2=['file2 position']; str3=['file3 position']; ... str=eval(['str',num2str(k)]); load([str,'filename']); [m n]=size(y); y=flipud(y); v=-v; x=x-x(1,1); y=y-