matlab中怎么导入三个文件,用三个文件的数据画三条线在一幅图里?答:x1=A1(:,1);y1=A1(:,2);filename='SJ2.xls'A2 = xlsread(filename);x2=A2(:,1);y2=A2(:,2);filename='SJ3.xls'A3 = xlsread(filename);x3=A3(:,1);y3=A3(:,2);2、使用plot函数,绘出每个文件中的数据图形。即 plot(x1,y1),hold on plot(x2,y2),hold on plot(...