Error: Undefined function 'plus' for input arguments of type 'cell'

Dear All

I am facing such error when I am trying to add cells. OM+M+w

Following is the result of whos:

 Name        Size            Bytes  Class    Attributes

   M         975x1           73842  cell

 Name        Size            Bytes  Class    Attributes

   OM        975x1           74000  cell           

 Name        Size            Bytes  Class    Attributes

   w         975x1           73482  cell

Actually I am trying to read a text file.

 =====================================================================
  24652 1996-063A   ARABSAT-2B                                       
  Launched: 1996-11-13 (318)           Start Date: 1996-06-12 (164)  
   Decayed:                             Stop Date: 2003-12-20 (354)  
=====================================================================
1 24652U 96063A   96318.74847837 -.00000020  00000-0  00000+0 0    14
2 24652   3.9929 210.6007 7281127 177.7757 190.4436  2.27277888    06
1 24652U 96063A   96319.62211352 -.00000020  00000-0  00000+0 0    31
2 24652   3.9929 210.3183 7284735 178.4392 185.2995  2.27373269    12
1 24652U 96063A   96319.62351606  .00008082  00000-0  30835-2 0    24
2 24652   3.9764 210.1654 7280836 178.5436 186.6267  2.27380102    20
1 24652U 96063A   96319.62356237  .00009638  00000-0  38025-2 0    37
2 24652   3.9632 210.3512 7280110 178.4006 186.6625  2.27374993    25
1 24652U 96063A   96320.05952563 -.00002597  00000-0 -98092-3 0    63
2 24652   3.9623 210.1661 7275699 178.7092 185.6294  2.27896863    39
1 24652U 96063A   96320.49676119 -.00000127  00000-0  10000-4 0    72
2 24652   3.9626 209.9743 7275563 179.0821 184.3511  2.27899371    49
1 24652U 96063A   96320.49712798  .00000100  00000-0  10000-3 0    53
2 24652   3.9640 209.9130 7275537 179.1425 184.6535  2.27900057    39
<end of file>

fid=fopen('2B.txt');
A=textscan(fid,'%s','HeaderLines',5);
Data=reshape(A{1}(1:end-3,:),9,[])';
fclose(fid);

l1=Data(1:2:end,:);
l2=Data(2:2:end,:);

OM=l2(:,4);          % RAAN
ecc=l2(:,5);          %Eccentricity
w=l2(:,6);               %Argument of perigee
M=l2(:,7);              %mean anomaly

FF=OM+w+M;

So I just want to know how can i add OM , w and M

Answer 1

[Matt Fig]

You cannot add cell arrays, just as the error states. Cell arrays are a little different than numerical arrays, and you need to be aware of those differences when dealing with them. And by the way, what is i? There is no variable i listed in your workspace, so you will get the imaginary unit. Is that what you wanted?

What do you want to do? Say we have these:

A = {2 3 4 5};  % Two cell arrays.
B = {6 7 8 9};

What do you want to do? Do you want:

C = {8 10 12 14} % C = cellfun(@plus,A,B,'Un',0)

or were you thinking more like this:

C = {2 3 4 5;6 7 8 9} % C = cat(1,A,B)

Be specific in what you want, and give a thorough description of what is in each element of your cell arrays. For example, is each element a scalar, as I show above, or is each element a numeric array? If the latter, do the sizes match between the elements of the cells you wish to add?

[Hamza]

I have edited the question Matt. I hope I am clear now.

[Hamza]

I tried cellfun but it gives the following error

DD = cellfun(@plus,M,OM,'Un',0)
Error using  + 
Matrix dimensions must agree.

Although the dimensions of both are the same.

[Tom]

My guess is they're strings not numeric data.

class(M{1})
class(OM{1})

to check

[Matt Fig]

I would tend to agree with Tom.

cellfun(@str2double,OM)+cellfun(@str2double,M)

[Hamza]

Thanks Matt it working great!! yes they were indeed strings.