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

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Shayma Al Ali 2021-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/1594294-how-to-get-the-indices-from-a-matrix-and-apply-it-to-vectors

编辑： the cyclist 2021-11-24

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 2021-11-24

编辑：the cyclist 2021-11-24

在 MATLAB Online 中打开

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 2021-11-24

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.

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Answer 1

the cyclist 2021-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/1594294-how-to-get-the-indices-from-a-matrix-and-apply-it-to-vectors#answer_838874

编辑：the cyclist 2021-11-24

在 MATLAB Online 中打开

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);