Error using plot comand

Question

george korris 2021-4-7

评论： george korris 2021-4-7

Hello guys i have the next code

clc;
clear all;
img = imread('1.jpg');
img = imcrop(img)
Y = abs(fft( mean( imrotate(img,30) ,1) ));
figure
plot(Y)

and when i run it i get the next error does anyone know why?

Error using plot

Data cannot have more than 2 dimensions.

Error in aa (line 8)

plot(Y)

Answer 1

DGM 2021-4-7

编辑：DGM 2021-4-7

img = imread('1.jpg');

img is a MxNx3 image. If you expect it to be MxNx1, flatten it in an appropriate manner.

Y = abs(fft( mean( imrotate(img,30) ,1) ));

now Y is a 1xPx3 array. plot() won't know what to do with that. You could squeeze or permute it into 2D

plot(squeeze(Y))

or you could just plot one channel at a time

plot(Y(:,:,1))

george korris 2021-4-7

i think this is what i want ,thank you DGM!!