How to merge and slice arrays of different sizes?

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HC98
HC98 el 28 de En. de 2023
Respondida: Chris el 28 de En. de 2023
Say I have one aray called `ydata` which has dimension 1x24000 and I want to slice a part of this array, say from index 2:3000 and merge it with another array we shall call `udata` which is itself 1x24000. How might I slice the bit I want from `ydata` and then merge it with `udata` if that makes sense?
I suppose what it boils down to is this:
  1. we have 2 arrays with the same dimension
  2. I want to slice a part from array 1 and merge it with array 2
Is this possible?
  3 comentarios
Chris
Chris el 28 de En. de 2023
Editada: Chris el 28 de En. de 2023
Are they double arrays? String arrays? chars? Do you want to add a second row to the array containing that slice?
u = randi(10,1,5);
y = randi(10,1,5);
u(2,2:4) = y(1,2:4)
u = 2×5
8 1 2 7 5 0 10 8 9 0

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Respuestas (2)

cdawg
cdawg el 28 de En. de 2023
Editada: cdawg el 28 de En. de 2023
I'm not totally sure if you mean add it as a new row to the second array or append the first array to the end of the second.
If you want to just append part of it to the end you can do this:
ydata = [2 1 9 10 11];
udata = [1 2 3 4 5];
newArray = [udata ydata(2:4)] % append indices 2 through 4 to the end of udata
newArray = 1×8
1 2 3 4 5 1 9 10
If you want to append part of ydata to a new row of udata, they need to have the same number of columns:
newArray = [udata(2:4); ydata(2:4)]
newArray = 2×3
2 3 4 1 9 10
Hope this helps

Chris
Chris el 28 de En. de 2023
Perhaps you'd be better off with a cell array.
ydata = randi(9,1,8)
ydata = 1×8
7 7 8 4 1 9 1 3
ydata = num2cell(ydata)
ydata = 1×8 cell array
{[7]} {[7]} {[8]} {[4]} {[1]} {[9]} {[1]} {[3]}
udata = num2cell(randi(9,1,8))
udata = 1×8 cell array
{[7]} {[2]} {[7]} {[2]} {[1]} {[3]} {[8]} {[7]}
udata(2,2:6) = ydata(1,2:6)
udata = 2×8 cell array
{[ 7]} {[2]} {[7]} {[2]} {[1]} {[3]} {[ 8]} {[ 7]} {0×0 double} {[7]} {[8]} {[4]} {[1]} {[9]} {0×0 double} {0×0 double}

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