How to convert 50x1 double to 1x100 double?

Question

Nazmi Rosly 2022-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1876507-how-to-convert-50x1-double-to-1x100-double

评论： Davide Masiello 2022-12-12

I want to convert 50x1 double to 1x100 double

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Davide Masiello 2022-12-12

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

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Answer 1

Steven Lord 2022-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1876507-how-to-convert-50x1-double-to-1x100-double#answer_1126212

在 MATLAB Online 中打开

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