How to to write a code to my n*1 matrix into differnt submatrices?

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sudheer kumar reddy
Hi guys, I have N*1 Index matrix with N rows. Where N varies for different files. My matrix consists N number of channels. I need to copy my channels into one group when difference between my channel is greater than one.I need to make differnt groups whenever differnce between the channels is greater than one. I tried to use Magic function and find function to save into different groups. When I use FIND function, I can find channels which difference are greater than one and less than one. I am unable to copy them into differnt groups.
Can anyone help me with this problem
Cheers,
Sudheer

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采纳的回答

Matt Fig
Matt Fig 2011-3-3
Can you give a small example matrix and what you expect the output to be?
It is still not clear what you want. I asked you to provide input and output. You provided input, but no output. How would you group these, in a cell array?
Here is a guess:
A = [164
165
166
167
175
176
177
189
190
195
196];
T = [1;diff(A)]==1;
t1 = [1 findstr((T).',[0 1])];
t2 = [findstr((T).',[1 0]) length(T)];
H = cell(1,length(t1));
for ii = 1:length(t1)
H{ii} = A(t1(ii):t2(ii));
end
R = num2cell(A(~ismembc(A,cat(1,H{:}))));
H(end+1:end+length(R)) = R
.
.
EDIT
A one-liner (FWIW):
groups = mat2cell(A,diff([0;find(diff(A) ~= 1);length(A)]),1);
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Walter Roberson
Walter Roberson 2011-3-4
Z = cellfun(@(G) mean(data(G)), groups);
S = cellfun(@(G) mean(t(G)), groups);

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更多回答（2 个）

Jan
Jan 2011-3-3
It sounds like you need HIST or HISTC, especially the 2nd output argument.
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sudheer kumar reddy
sudheer kumar reddy 2011-3-3
I went through HIST. But, this only helps me to find count of my array. Where as, I need to group my data points in different groups.
Can you please give me any further advice.
please do not hesitate to ask any more information.
Cheers

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Paulo Silva
Paulo Silva 2011-3-3
a=[164 165 166 167 175 176 177 189 190 195 196]';
b=diff(a); %find differences
idx=find(b>1); %find their indexes
idx=[idx;numel(a)]; %add the last value as index
cel=cell(1,numel(idx)); %make a cell to hold the groups
sv=1; %start value
for f=1:numel(idx)
cel{f}=a(sv:idx(f)); %take each part of a into a group
sv=idx(f)+1; %make the next start value
end
bar(cellfun(@mean,cel))
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sudheer kumar reddy
sudheer kumar reddy 2011-3-3
Thanks for the code. In the following code I am not aware of how many a values I get. So, I am not sore about number of groups I get. If I get this I need to calculate mean between values in my group and plot.
Can you please help me with this. Please do not hesitate to ask any more information.
cheers

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