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How to combine sections from Workspace into a new vector?

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FW
FW on 19 Apr 2019
Edited: madhan ravi on 20 Apr 2019
I have Matlab 2017b.
1) If we have two vectors A and B, in the workspace (1000x1), each of same dimension. How can one combine certain sections of A and B to form a new vector D (1000x1), by taking desired data of interest from A and B?
Is there a simple way to achieve this?
2) If we have a vector (1000 x 3) in the workspace, how can we define a new variable Z which contains selected data from an ith row to jth row from vector (1000x3)?
Thank you.

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madhan ravi
madhan ravi on 20 Apr 2019
Edited: madhan ravi on 20 Apr 2019
Yes ,simply use basic indexing:
% 1)
D = [A(1:500);B(1:500)] % example
% 2)
ith_row = 400;
jth_row = 700;
Z = matrix(ith_row:jth_row,:) % matrix is of size 1000 X 3

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FW
FW on 20 Apr 2019
Thanks. Where will we place the variable name? If we have multiple datasets in the workspace, how will it the data (200:400, 1) command recognize the data set.
madhan ravi
madhan ravi on 20 Apr 2019
data is the name of the variable that you want to extract. For example if you have variable named Z which is of size 1000 X 3 then
Z(200:400,1)

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