[HELP plz] How to seperate Column Data into values greater than and less than all into new Column

Hi

I have a problem, where i get undefined function gt and so on...annoying and cant figure why..been searching the net and no luck. here is the question:

i have a matrix with: 137242x1 cell called V. containing some voltage. what i want this code to do is seperate the voltages so it makes a new Column with Values greater than 230 into 1 Cell for itself..and values less than 225 into another..and values remaining at 225-230.

i have for starters used for..but not working:

n = 1;
i = 0;

for i=1:length(V)
     X = V > 230

end

help please :)

[Metin]

for any given U

if true
  k_1 = U(U>230); % 
  k_2 = U(U<225);
  k_3=U(~ismember(U,[k_1,k_2]))
end

[Walter Roberson]

Provided U is a numeric matrix. The V in the question is a cell array.

[Metin]

that is right it would be better to turn the cell array in vector form with

    % U=U';

[awda]

Undefined function 'gt' for input arguments of type 'cell'.

Error in test1 (line 38) k_1 = U(U>230); %

[Walter Roberson]

If U is a cell array then U' does not turn it into a vector: it takes the transpose of the cell array leaving a cell array as the result.

Answer 1

[Walter Roberson]

If each cell contains exactly one scalar, then the simplest to program is

U = cell2mat(V);

and then work with the numeric matrix U in ways similar to what Metin showed.

idx1 = U > 230;
idx2 = U < 225;
idx3 = ~(idx1 | idx2);
k_1 = U(idx1);
k_2 = U(idx2);
k_3 = U(idx3);

[awda]

this is what i get:

Error using cat Dimensions of matrices being concatenated are not consistent.

Error in cell2mat (line 84) m{n} = cat(1,c{:,n});

Error in test1 (line 36) U = cell2mat(V);

[Walter Roberson]

Your cell array is not completely numeric. The string in your first cell is causing the problem.

Do as I showed above but starting with

U = cell2mat(V(2:end));

Provided that all the other entries are numeric scalars.

Question: do the cells hold strings rather than numeric values??