Join Matrices in MATLAB

Question

I have two matrices like the following ones:

\'01/01/2010\'          1
\'02/01/2010\'          2
\'03/01/2010\'          3
\'05/01/2010\'         11
\'06/01/         


        

Answer 1

In MATLAB, you cannot have strings as matrix elements. For that you need to use a cell array. This is a solution using cell arrays and containers.Maps.

FirstCellArray = {
'01/01/2010', 1;
'02/01/2010', 2;
'03/01/2010', 3;
'05/01/2010', 11;
'06/01/2010', 17
};

SecondCellArray = {
'01/01/2010', 4;
'02/01/2010', 5;
'04/01/2010', 6;
'05/01/2010', 7;
};

AllDatesCellArray = union(FirstCellArray(:,1), SecondCellArray(:,1));

% Create containers.Maps for both cell arrays. containers.Maps are hash tables.

DateToFirstNumberMap = containers.Map(FirstCellArray(:,1), FirstCellArray(:,2));
DateToSecondNumberMap = containers.Map(SecondCellArray(:,1), SecondCellArray(:,2));

WithNaNsCellArray = AllDatesCellArray;

for Index = 1:size(WithNaNsCellArray, 1)
    Key = AllDatesCellArray{Index, 1};
    try
        NumberOne = cell2mat(values(DateToFirstNumberMap, cellstr(Key)));
    catch
        NumberOne = NaN;
    end
    WithNaNsCellArray{Index, 2} = NumberOne;
    try
        NumberTwo = cell2mat(values(DateToSecondNumberMap, cellstr(Key)));
    catch
        NumberTwo = NaN;
    end
    WithNaNsCellArray{Index, 3} = NumberTwo;
end

WithoutNaNsCellArray = WithNaNsCellArray;
NaNIndicesVector = (isnan([WithNaNsCellArray{:,2}]) | isnan([WithNaNsCellArray{:,3}]));
WithoutNaNsCellArray(NaNIndicesVector == 1, :) = [];

Then WithNaNsCellArray contains the result with NaN rows and WithoutNaNsCellArray contains the result without NaN rows.

WithNaNsCellArray = 
'01/01/2010'    [  1]    [  4]
'02/01/2010'    [  2]    [  5]
'03/01/2010'    [  3]    [NaN]
'04/01/2010'    [NaN]    [  6]
'05/01/2010'    [ 11]    [  7]
'06/01/2010'    [ 17]    [NaN]

WithoutNaNsCellArray = 
'01/01/2010'    [ 1]    [4]
'02/01/2010'    [ 2]    [5]
'05/01/2010'    [11]    [7]