How to convert 50x1 double to 1x100 double?

I want to convert 50x1 double to 1x100 double

[Davide Masiello]

What are the extra 50 elements in the 1x100 array?

Answer 1

[Steven Lord]

How do you want the additional 50 elements to be created?

Or to give a smaller example, take y.

y = (1:5).^2

y = 1×5

1 4 9 16 25

If we wanted to create a vector x from y and have x contain 10 elements, how do you want to generate those elements?

Duplicating those elements?

x1 = repmat(y, 1, 2)

x1 = 1×10

1 4 9 16 25 1 4 9 16 25

x2 = repelem(y, 2)

x2 = 1×10

1 1 4 4 9 9 16 16 25 25

Pad with some placeholder values?

x3 = [y, zeros(1, 5)]

x3 = 1×10

1 4 9 16 25 0 0 0 0 0

x4 = [NaN(1, 5), y]

x4 = 1×10

NaN NaN NaN NaN NaN 1 4 9 16 25

Interpolation & extrapolation?

x5 = interp1(y, 1:0.5:5.5, 'linear', 'extrap')

x5 = 1×10

1.0000 2.5000 4.0000 6.5000 9.0000 12.5000 16.0000 20.5000 25.0000 29.5000

x6 = interp1(y, 1:0.5:5.5, 'spline', 'extrap')

x6 = 1×10

1.0000 2.2500 4.0000 6.2500 9.0000 12.2500 16.0000 20.2500 25.0000 30.2500

Or some other method?