作业帮[m n]=size(I)subplot(2,1,1),imshow(I);title({'原图像'});y1=I(4,:);y2=I(5,:);y3=I(6,:);y4=I(7,:);y5=I(8,:);y6=I(9,:);y7=I(10,:);y8=I(20,:)*2;subplot(212)plot(1:n,y8)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/16 03:49:54
![[m n]=size(I)subplot(2,1,1),imshow(I);title({'原图像'});y1=I(4,:);y2=I(5,:);y3=I(6,:);y4=I(7,:);y5=I(8,:);y6=I(9,:);y7=I(10,:);y8=I(20,:)*2;subplot(212)plot(1:n,y8)](/uploads/image/z/3166267-67-7.jpg?t=%5Bm+n%5D%3Dsize%28I%29subplot%282%2C1%2C1%29%2Cimshow%28I%29%3Btitle%28%7B%27%E5%8E%9F%E5%9B%BE%E5%83%8F%27%7D%29%3By1%3DI%284%2C%3A%29%3By2%3DI%285%2C%3A%29%3By3%3DI%286%2C%3A%29%3By4%3DI%287%2C%3A%29%3By5%3DI%288%2C%3A%29%3By6%3DI%289%2C%3A%29%3By7%3DI%2810%2C%3A%29%3By8%3DI%2820%2C%3A%29%2A2%3Bsubplot%28212%29plot%281%3An%2Cy8%29)
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[m n]=size(I)subplot(2,1,1),imshow(I);title({'原图像'});y1=I(4,:);y2=I(5,:);y3=I(6,:);y4=I(7,:);y5=I(8,:);y6=I(9,:);y7=I(10,:);y8=I(20,:)*2;subplot(212)plot(1:n,y8)
[m n]=size(I)subplot(2,1,1),imshow(I);title({'原图像'});y1=I(4,:);y2=I(5,:);y3=I(6,:);y4=I(7,:);y5=I(8,:);y6=I(9,:);y7=I(10,:);y8=I(20,:)*2;subplot(212)plot(1:n,y8)
[m n]=size(I)subplot(2,1,1),imshow(I);title({'原图像'});y1=I(4,:);y2=I(5,:);y3=I(6,:);y4=I(7,:);y5=I(8,:);y6=I(9,:);y7=I(10,:);y8=I(20,:)*2;subplot(212)plot(1:n,y8)
size返回的m*n是矩阵i的维数;subplot(2,1,1),表示话2行1列的图,把imshow放在第一个位置
imshow(I)就是直接按I的灰度级画出图.y8=I(20,:)*2表示y8是I的第20行的数据的2倍
最后会把矩阵I的第20行的数据的2倍（即为y8）画出来