randomly sample a pair of values in a double

2 views (last 30 days)
I have two doubles of the type coord_iso=65x2 double and coord_ce=65x2 double (they are all pairs of geographic coordinates).
I need to RANDOM sample one of the coordinate pairs inside the coord_iso. how can I do?
then with this randomly sampled pair and the first pair of coord_ce (row 1) I have to calculate the distance in km. in this case I was thinking of using distance and then the value/180*pi*6371.
you can help me?

Accepted Answer

Star Strider
Star Strider on 8 Dec 2022
I need to RANDOM sample one of the coordinate pairs inside the coord_iso. how can I do?
One option —
RandomRow = randi(size(coord_iso,1));
RandomResult = coord_iso(RandomRow,:)
These can be combined into one assignment —
RandomResult = coord_iso(randi(size(coord_iso,1)),:)
Example —
coord_iso = [ 91.36 14.46
91.38 14.50
91.42 14.51
91.46 14.51
91.49 14.47];
RandomResult = coord_iso(randi(size(coord_iso,1)),:)
RandomResult = 1×2
91.3800 14.5000
.

More Answers (1)

Jan
Jan on 8 Dec 2022
You want a random integer in the range [1, 65] as index? randi([1, 65])
I have no idea, what "distance and then the value/180*pi*6371" means.
  2 Comments
ELISABETTA BILLOTTA
ELISABETTA BILLOTTA on 8 Dec 2022
for example, coord_iso (5x2 double)= 91,36 14,46
91,38 14,50
91,42 14,51
91,46 14,51
91,49 14,47
writing
a=coord_iso(randi(5,1))
I can randomly select a value in the first column. how do I then select the value of the second column corresponding to the one selected randomly in the first column?
for example in this case if a=91.38, how do I then select the 14.50 which is its equivalent but in the second column?
Jan
Jan on 8 Dec 2022
To select the complete row:
a = coord_iso(randi(5,1), :)

Sign in to comment.

Categories

Find more on Geographic Plots in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!