Combine 2 matrices - matlab

Question

There is:
a = [1;2;3;4;5;6;7;8;9;10]; %(10x1 double)
b = [1;3;4;5;6;9]; %(6x1 double)
I hope to combine a and b. So my expected result is:
I think may be use conditional or first import zeros(10 2)? Could you help me?

Answer 1

Method 1: Conditional Checking
Checks if the values in the arrays match before filling the combined array. If they match both columns are filled. If they do not match the "NaN" undefined term is placed in the array. The variable Index that controls the scanning for array b is only incremented upon finding a match between both arrays.
%Method 1: Conditional%
a = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10];
b = [1; 3; 4; 5; 6; 9];
%Creating a result array of the same length as array "a"%
Combined_Array = zeros(length(a),2);
%Copying the first column into the result array "Combined_Array"%
for Row = 1: +1: length(a)
Combined_Array(Row,1) = a(Row,1);
end
%Padding the array "b" with zeroes to match the length of array "a"%
b = [b; zeros(length(a) - length(b),1)];
Index = 1;
for Row = 1: +1: length(a)
%If the values in arrays "a" and "b" do not match%
if a(Row,1) ~= b(Index,1)
Combined_Array(Row,2) = "NaN";
Index = Index - 1;
end
%If the values in arrays "a" and "b" match%
if a(Row,1) == b(Index,1)
Combined_Array(Row,2) = b(Index,1);
end
Index = Index + 1;
end
%Printing the result%
Combined_Array
Method 2: Concatenation and Filling Arrays
Fill in the arrays where the undefined term "NaN" is expected and concatenate the rest of the content accordingly. Using horzcat will concatenate columns together side by side. (vertcat concantates rows on top of one another)
%Method 2: Hard-Coded and Concatenation%
a = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10];
b = [1; 3; 4; 5; 6; 9];
b = [b(1); "NaN"; b(2:5);"NaN"; "NaN"; b(6); "NaN"];
Combined_Array = horzcat(a,b);