CODEWITHSUNDEEP
matlabmatrixdimensionscell-array
beginh
beginh

Reputation: 1153

How to add two cells in matlab

I have B <1x3 cell> like this:

B{1} = [2 1 19 22 29 13 14]
B{2} = [11 12 6 3 4 2 5]
B{3} = [3 2 23 13 4 7 8]

And I want to add A <4x2 cell> like this:

A = {'a' '-1'; 'b' '1'; 'c' '2'; 'd' ''}

I tried like this:

for j=1:length(A)
  for i=1:1:length(B)
    C = B{i} + A{j,2};
  end
end

what I get is "Matrix dimensions must agree." How can I do it properly?

Upvotes: 2

Views: 3592

Answers (2)

Danil Asotsky
Danil Asotsky

Reputation: 1241

Your code contains several problems:

First is shown in @angainor answer. You need to convert string to number.

Second one is following. B{i} is matrix of size 7x1, A{j,2} is single number. Do you want to add this number to all elements of matrix B{i}? In this case, you should write something like:

B{i} + str2double(A{j,2}) * ones(size(B{i}))

Third problem is that length(A) command will return total number of elements in A, e.g. 4*2=8. Therefore, you will have error: Can not access element A{5,2}. You need replace this line with

for j = 1:size(A,1)

Upvotes: 1

angainor
angainor

Reputation: 11810

A holds characters. You need to convert the strings to numbers to be able to add them to B. Use e.g. str2double:

for j=1:length(A)
  for i=1:1:length(B)
    C = B{i} + str2double(A{j,2});
  end
end

Note that the last value in A is '', which is converted to a NaN.

Upvotes: 3

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