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help me finding this error

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monisha silvia
monisha silvia 2018-3-17
评论： Rik 2018-3-18
Error using .* Matrix dimensions must agree.
Error in main (line 175) p = ((1-rho).*p + rho.*delta_p_current.*v).*delta_p_current + p.*(abs(1-delta_p_current));
  2 个评论
Rik
Rik 2018-3-17
The dimensions don't agree. You can't use an element-wise operation if the dimensions don't match.
Rik
Rik 2018-3-18
How do you expect me to read the code you e-mailed me? Did you manually removed all line ends? I will not have any look at your code unless and until it is in a readable format. You should either post it here (edit your question and use the {}Code button), or attach the m-file. (don't forget to attach any necessary other files as well in a zip)
If you use the debugger to stop execution at that line, you will be able to see the dimensions of each variable so you can check if any are a size you don't expect.
Also, you should try to convert this to a MWE. Remove a much code as you can that doesn't affect the error. Doing that already helps you find the error, and if you don't find it, we will have less code to debug.

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采纳的回答

Rik
Rik 2018-3-18
The problem is that this line
temp = find(cumsum(ant_transit_prob)>=rand(1), 1);
sometimes returns an empty vector. I don't know what this algorithm is supposed to do, but you will have to change this line to make sure temp contains a valid value.
Also, the reading of the image should be changed to this:
% image loading
filename ='03';
img = rgb2gray(imread([filename '.jpg']));
[nrow, ncol] = size(img);
  2 个评论
monisha silvia
monisha silvia 2018-3-18
Error using .* Matrix dimensions must agree.
Error in main (line 175) p = ((1-rho).*p + rho.*delta_p_current.*v).*delta_p_current + p.*(abs(1-delta_p_current));
Rik
Rik 2018-3-18
Just as with the previous function: imread returns a matrix with 3 dimension, while the rest of you code assumes a 2D matrix.
img=im2double(rgb2gray(im));

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monisha silvia
monisha silvia 2018-3-18
new to matlab. finding difficult to solve

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