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"Data dimensions must agree" Error

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Amr el 14 de Mayo de 2011
Comentada: Alexandra Roxana el 18 de Jul. de 2021
[code]im = im2double(imread('rice.png'));
[X Y]= meshgrid(1:size(im,1),1:size(im,2));
when i run this script it worked me fine but when i tried to change the image to RGB image it gives me this 2 errors
??? Error using ==> surf at 78 Data dimensions must agree.
Error in ==> CoOrdinating at 6 surf(zeros(size(im)),X,Y,im,'EdgeColor','none');
i tried to convert the image to grayscale but it didn't work with me and gave me the same errors
any help ?
  3 comentarios
Amr el 14 de Mayo de 2011
when i used another image which is colored one
Jan el 14 de Mayo de 2011
Please post the Matlab code. Bugs in the code cannot be found in a text description of the method.

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Respuesta aceptada

Andrew Newell
Andrew Newell el 15 de Mayo de 2011
Here is a demo that works:
rgb_img = imread('ngc6543a.jpg');
I = .2989*rgb_img(:,:,1)...
I = double(I);
[X,Y]= meshgrid(1:size(I,1),1:size(I,2));
Probably you didn't take the transpose of I in the surf command. I don't know why you need to do this, but you do.
  2 comentarios
Walter Roberson
Walter Roberson el 15 de Mayo de 2011
Taking the transpose or not would be the difference between using meshgrid() or using ndgrid().
>> size(meshgrid(1:2,1:3))
ans =
3 2
>> size(ndgrid(1:2,1:3))
ans =
2 3
Andrew Newell
Andrew Newell el 15 de Mayo de 2011
Good point. I had a feeling I'd be hearing from you!

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Más respuestas (3)

Andrew Newell
Andrew Newell el 14 de Mayo de 2011
If you enter the command
I = imread('rice.png');
you get a matrix. If you enter
I = imread('ngc6543a.jpg');
you get a 3D array with one page for each of the R, G and B components of the color. This does not have the same dimensions as the matrices X and Y.
  2 comentarios
Amr el 14 de Mayo de 2011
i convert it to gray scale and it became matrix like the other X and Y
Walter Roberson
Walter Roberson el 16 de Mayo de 2011
Amr, I am not sure whether you are still having difficulty with this matter?

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guj el 15 de Mayo de 2011
am also stuck in same thing I have samples point of 5:5:85 missing samples i have 17 numbers which i have chosen has missing %.
so my vector is of length 17 by 1
Number of iteration = 500;
number of iteration carried out for reconstruction is 500 but 100 seems to be i have just zeros after 100 row my matrix is 500 by 17 in my error)matrix
I am using [X,Y]=meshgrid(iteration,missing sample) surf(X,Y,errormatrix(1:100,:))
But i am getting error...
whole objective is to show 3d graph having iteration on one axis, missing % of samples on other axis and error on the third one
This is what i am doing
[X,Y]=meshgrid(x,y) x=1 by 17 (decimation factors) y=1 by 100 (number of iteration)
errormatrix=[100 by 17] whch shows error during 100 iteration for each decimation %.
now surf(X',Y,errormatrix(1:100,:))
Error dimension at 78
  1 comentario
Andrew Newell
Andrew Newell el 15 de Mayo de 2011
This is not an answer to this question and shouldn't be here. If my answer above doesn't solve your problem, you could make a new question. Please delete this one.

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Alexandra Roxana
Alexandra Roxana el 18 de Jul. de 2021
Hello! I'm having the same problem. I want to plot the results from the following code:
clear all
alpha = 2;
dx = 1;
dt = (dx^2)/(4*alpha);
gamma = (alpha*dt)/(dx^2);
itert = 1000;
uinit = 0;
%Boundary conditions
for k=1:itert-1
for i=2:L-1
for j=2:L-1
u(k+1,i,j) = gamma*(u(k,i+1,j) + u(k,i-1,j) + ...
u(k,i,j+1) + u(k,i,j-1) - 4*u(k,i,j)) + u(k,i,j);
  8 comentarios
Torsten el 18 de Jul. de 2021
Then replace
U = u(1,:,:)
U(:,:) = u(1,:,:)
Alexandra Roxana
Alexandra Roxana el 18 de Jul. de 2021
Now it works! Thank you! I guess I have to work on the code because the graph isn't quite what I expected it to be.

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