concatenation between string and i

Question

I have two cells:

table1 = cell(1,1);
table2 = cell(1,1);

table1{1}(:,1) = [1 2 3];
table1{1}(:,2) = [4 5 6];
table2{1}(:,1) = [3 6 5];
table2{1}(:,2) = [4 9 7];

>>table1{1}

ans =

 1     4
 2     5
 3     6

>> table2{1}

ans =

 3     4
 6     9
 5     7

What I want is two compute the sum of all the columns of each table. For example, for table1:

sum (column1 , column2) = result_column.

By the way I wrote the code below:

table_list = cell(2, 1);
for i=1:2
    table_list{i} = strcat('table', num2str(i)); % table_list{1}='table1', table_list{2} ='table3'
end

sum = zeros(3,1);

for i=1:2
    x = table_list{i};
    for j=1:2
        sum = sum + x{1}(:, j) % here I got always the error below
    end
end

What is my problem:

I always get the error

??? Cell contents reference from a non-cell array
object.

So I don't know how to concatenate 'table' with 'i' in order to get table1{1}(...) and table2{1}(...).

Any help will be very appreciated!

Well, x is clearly a string, not a cell array. Why not just put the matrices directly in a 2x1 cell array and save mucking about with variable names at all? — Notlikethat
– Notlikethat, Commented Mar 19, 2014 at 22:52

Andrew Janke · Accepted Answer · 2014-03-20 02:25:27Z

1

Your concatenation is ok, you just need to use function "eval" to execute the string as a MATLAB expression. Just replace x = table_list{i}; with x=eval(table_list{i}); and you can access the cell.

I wouldn't use "sum" as the name of the variable since it is a Matlab function. You can compute the sum of the columns using sum(x{1}(:, j)) (after removing the line sum = zeros(3,1);).

edited Mar 20, 2014 at 2:25

Andrew Janke

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answered Mar 20, 2014 at 0:08

Moreira

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