Cell2mat not working for high cell count

1 次查看（过去 30 天）
Adel Hafri
Adel Hafri 2022-3-4
编辑： Jan 2022-3-4
Hello, being trying to code Run length enc/dec on Matlab, and my work worked perfectly for test matrixes, but as soon as i tried 512x512 Matrix Cell2mat started giving me this error :
Error using cat
Dimensions of arrays being concatenated are not consistent.
Error in cell2mat (line 83)
m{n} = cat(1,c{:,n});
this is my code:
clear all;
%***reading a matrix x from the directory c:\
x=imread(['c:\mAT\512x512-No-Noise.jpg']);f=size(x);
c=1;
y={};
z=[];
for i=1:f(1)
y{i}=[];
for j=1:f(2)-1
if x(i,j)==x(i,j+1)
c = c + 1;
else
y{i}=[y{i} c x(i,j)];
c=1;
end
end
y{i} =[y{i} c x(i,f(2))];
c=1;
end
y
k=size(y);
z={};
for s=1:k(2)
a=size(y{1,s})
L=1;
z{s}=[];
while(L<a(2))
for n=1:y{1,s}(1,L);
z{s}=[z{s} y{1,s}(1,L+1)];
end
L = L+2;
end
end
new_z=cell2mat(z(:))
  1 个评论
Jan
Jan 2022-3-4
Please use a standard indentation: ctrl-a ctrl-i in the editor. This improves the readability.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Jan
Jan 2022-3-4
编辑：Jan 2022-3-4
This means, that the arrays stored in the cell do not have matching sizes. Check this:
sizeZ = [cellfun('size', z(:), 1), cellfun('size', z(:), 2)];
unique(sizeZ, 'rows')
Of course this is not a problem of cell2mat . Remember that this function is used for decades by many Matlab codes. It would be extremely surprising, if you find a bug in it...
An efficient method for expanding is repelem:
k = numel(y);
z = [];
for s = 1:k
n = y{s}(1:2:end); % Every 2nd element starting from first
b = y{s}(2:2:end); % ...starting from second
z(s, :) = repelem(n, 1, b);
end
By the way, when I run your code with the test data:
x = randi([0, 255], 512, 512);
it does not cause an error.

类别

在 Help Center 和 File Exchange 中查找有关 Data Distribution Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by