MATLAB: Function deal()

dealMATLABsingle inputvariable distribution

I'm having trouble getting deal() to place one number in multiple places. My lines of code:

y1=[];

y2=[];

y3=[];

y={y1 y2 y3};

y=deal(5);

gives me the error: The right hand side of this assignment has too few values to satisfy the left hand side.

y = cell(1,3);  % dispense with the y1, y2, y3 stuff....
[y{:}] = deal(5)

or, without defining the variable first:

[Y{1:3}] = deal(5)  % Y is not defined before this line..

But why use DEAL at all?

y = cell(1,3);
y(:) = {9}

xy = reshape([y;x],1,[]);

The first mistake was creating variable names like this: x, x2, x3. Such variable names make it extremely difficult to write compact code and are discouraged: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval. It is better to create a cell array, and then you could easily use for-loop. For example, now you can do something like this

X = {x, x2, x3, x4, x5, x6, x7, x8, x9, x10};
Y = {y, y2, y3, y4, y5, y6, y7, y8, y9, y10};
for i = 1:numel(X)
    figure(i)
    plot(X{i}, Y{i})
end