How to change a cell array into vector in matlab?

Question

I have a cell array which each cell is a point on (x,y) coordination (i.e, the cells are of size [1x2]). Is it possible to change it to matrix that those coordination points to be reserved?

Because when I used cell2mat, the peculiar coordination was change to the size of [1x1] while I need the coordinates.

my cell array is like this: [0,2] [0,2] [1,3] [-13,10] [1,4] [-1,5]

How I can change it to a vector that these coordinates can be used later for plotting?

Maybe its better to ask that how I can plot a cell array while each cell is a peculiar coordinate on (x,y)? — Biju
– Biju, Commented Jan 23, 2014 at 15:22
@Biju Exactly as Luis has shown, and then plot(result(:,1),result(:,2),'*') — Dan
– Dan, Commented Jan 23, 2014 at 15:24

Luis Mendo · Accepted Answer · 2014-01-23 15:25:56Z

6

>> myCell = {[1 2],[3 4],[5 6]}; %// example cell. Can have any size/shape
>> result = cell2mat(myCell(:)) %// linearize and then convert to matrix
result =
     1     2
     3     4
     5     6

To plot:

plot(result(:,1),result(:,2),'o') %// or change line spec

edited Jan 23, 2014 at 15:25

answered Jan 23, 2014 at 15:05

Luis Mendo

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3 Comments

Biju Over a year ago

thanks Luis, but I want to plot these coordinates of [x y], while they are in cell format and don't need to get them seperated

Luis Mendo Over a year ago

In your question you say "change it to matrix"... Anyway, see updated answer

Muhammad Usman Saleem Over a year ago

@LuisMendo what about myCell = {[1 2 3],[3 4 ],[5 6 5 6 7]} then how can i convert this cell array to vector?

Amro · Accepted Answer · 2014-01-25 00:54:03Z

4

Another way to accomplish this:

c = {[1 2], [3 4], [5 6]};
v = vertcat(c{:});    % same as: cat(1,c{:})

plot(v(:,1), v(:,2), 'o')

Cell arrays in MATLAB can be expanded into a comma-separated list, so the above call is equivalent to: vertcat(c{1}, c{2}, c{3})

edited Jan 25, 2014 at 0:54

answered Jan 23, 2014 at 16:21

Amro

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3 Comments

Muhammad Usman Saleem Over a year ago

what about c= {[1 2 3],[3 4 ],[5 6 5 6 7]} then how can i convert this cell array to vector?

Amro Over a year ago

in your case, you can only flatten the cell array into a one-dimensional vector (1x10 vector) as v = [c{:}] or v = cat(2, c{:}). You see when concatenating arrays, the dimensions must be consistent; you can't have a "jagged" matrix

Amro Over a year ago

otherwise you can pad each cell with NaNs so that all rows have the same length before concatenation. You can find plenty of similar questions here on Stack Overflow, for example this one: stackoverflow.com/q/3054437/97160

Tobias · Accepted Answer · 2014-01-23 15:35:01Z

0

myCell = {[0,2] [0,2] [1,3] [-13,10] [1,4] [-1,5]};
hold on;
cellfun(@(c) plot(c(1),c(2),'o'),myCell);

answered Jan 23, 2014 at 15:35

Tobias

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