MATLAB: How to create a vector of elements with a number of row equal to a number

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Hello everyone,

I am trying to create a vector "A" 521×1 that have the last 20 rows equal to the last row of a vector "B" 26×1 and, furthermore, the rows from 501 to 482 equal to the row 25 of the vector "B". Continuosly, the rows of "A" from 481 to 462 equal to row 24 of vector "B" and then rows of "A" from 461 to 442 equal to row 23 of vector "B" and so on until the end of the vectors. At the end, I expect to obtain a vector "C" 521×1 with equal rows every 20 rows.

Could someone help me?

Thank you in advance

Best Answer

Honestly I am not able to get you but perhaps you just want:

C = repelem(B,20)

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MATLAB: How to apply the same function on different rows of a vector

If I got the question right, this is how it should work:

andr = randn(521,1) 
andrn = 1/100*andr(521:-20:1) % you can use 1/100.*(andr(521:-20:1,:)) in case there are more columns

The code will give the last value (on 521st row) first as you mentioned in the question.

MATLAB: Function repeat number

combvec() from the Deep learning toolbox is most easiest solution

a = [1 2 3]
b = [1 2 3]
C = combvec(a, b).'; % if the order of column is important: C = fliplr(combvec(a, b).');

The other solution is to use ndgrid()

a = [1 2 3]
b = [1 2 3]
[A, B] = ndgrid(a, b);
C = [B(:) A(:)]

Best Answer

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MATLAB: How to apply the same function on different rows of a vector

MATLAB: Function repeat number

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