How to repeat element of array to complete Specific shape In matlab

Hello Everyone i hope you are doing well. I have the following dataset

One has 30 samples ( Shape 30x1) and other has 115 samples(Shape 115x1) . My network is trained on shape (1000x1). I want to repeat elements of the array from start to complete 1000 samples.

The samples varries (10-1000) like shape is 10x1 or 388x1

for example the data is look like that, so it will repeat from start to complete 1000 samples

How can i do it in MATLAB

Answer 1

[Voss]

You can use repmat() to replicate the array (or repelem() to repeat each element of the array) enough times to get at least 1000 rows, then remove the extra.

load('dataset1.mat');
load('dataset2.mat');

N_needed = 1000;

dataset1_new = repmat(dataset1,ceil(N_needed/size(dataset1,1)),1);
dataset1_new(N_needed+1:end,:) = [];

dataset2_new = repmat(dataset2,ceil(N_needed/size(dataset2,1)),1);
dataset2_new(N_needed+1:end,:) = [];

whos

  Name                 Size            Bytes  Class     Attributes

  N_needed             1x1                 8  double              
  ans                  1x37               74  char                
  dataset1            30x1               240  double              
  dataset1_new      1000x1              8000  double              
  dataset2           115x1               920  double              
  dataset2_new      1000x1              8000  double              

Answer 2

[Star Strider]

See my Answer to How to repeat element of array to complete Specific shape In matlab

EDIT — (11 Mar 2022 at 6:14)

There is one other way I can think of to do this, however it involves some compromises since it ‘squeezes’ the 1020-element vector into 1000 elements, or ‘stretches’ the 990-element vector to 1000 elements (both will work with this code, although I am only showing one here):

x1 = 1:numel(stretch1);                                 % Match 'stretch1' Length
xq = linspace(1, numel(stretch1), DesiredLength);       % 'DesiredLength' Interpolation Vector
squeeze1 = interp1(x1, stretch1, xq);                   % Interpolate (Decimal Fractions)
squeeze1i = round(squeeze1);                            % Integers Only

figure
subplot(3,1,1)
plot(x1, stretch1)
xlim([1 numel(stretch1)])
grid
title(sprintf('Original Vector, Length = %d',numel(stretch1)))
subplot(3,1,2)
plot(xq, squeeze1)
xlim([1 numel(stretch1)])
grid
title(sprintf('Squeezed Vector, Length = %d',numel(squeeze1)))
subplot(3,1,3)
plot(xq, squeeze1i)
xlim([1 numel(stretch1)])
grid
title(sprintf('Squeezed Integer Vector, Length = %d',numel(squeeze1i)))