# How to get the indices from a matrix and apply it to vectors?

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Shayma Al Ali on 23 Nov 2021
Edited: the cyclist on 24 Nov 2021
I have a matrix of wind speeds that is 80 x 160. I also have vectors of latitudes (80x1) and longitudes (160x1). I want to be able to find high wind speeds in the matrix and then also use those indices to get the latitudes and longitudes. How could I go about this?
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the cyclist on 24 Nov 2021
Edited: the cyclist on 24 Nov 2021
Exactly what you want to do is not clear to me.
Suppose you had this smaller, 3x5 matrix instead (and associated lat/long):
rng default
lat = rand(3,1);
long = rand(5,1);
wind = rand(3,5)
wind = 3×5
0.9575 0.9706 0.8003 0.9157 0.6557 0.9649 0.9572 0.1419 0.7922 0.0357 0.1576 0.4854 0.4218 0.9595 0.8491
Which "high wind speeds" do you want?
Shayma Al Ali on 24 Nov 2021
So in my matrix, the wind speeds range from 2 to 20 m/s. I want to get the wind speeds that are greater than 15 m/s. I also want to get the lats and lons of those wind speeds that are greater than 15 m/s.

the cyclist on 24 Nov 2021
Edited: the cyclist on 24 Nov 2021
Here is how you can do that, using my small example:
rng default
HIGH_WIND = 0.96; % <------ CHANGE THIS TO 15
lat = rand(3,1);
long = rand(5,1);
wind = rand(3,5);
high_wind = wind(wind>0.96);
[high_wind_lat_idx, high_wind_long_idx] = find(wind>HIGH_WIND);
high_wind_lat = lat(high_wind_lat_idx);
high_wind_long = long(high_wind_long_idx);

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