Using Conditions from One Array To Select Data from Another
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I have an array that stores generated hurricane data for hundreds of years with column 1 as the year, column 2 as the latitude, and column 3 as the longitude. I have another array that has a specific selection of years that I want to pull the data from e.g. 857, 865, 890, etc. How do I set up the code to do that? I have tried quite a few different ways and I am always getting the "Arrays have incompatible sizes for this operation." error.
idx=find(comyearlatlong==year_weak_elnino)
I have tried looking into the documentation but I'm just not understanding it well enough to brute force it. I've attached the two files I'm using.
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load comyearlatlong.mat
load year_weak_elnino.mat
whos *year*
[ism,idx] = ismember(comyearlatlong(:,1),year_weak_elnino);
whos i*
ism is a 115600x1 logical vector saying whether each year in comyearlatlong(:,1) is in year_weak_elnino.
idx is a 115600x1 vector of indices - the location where each element of comyearlatlong(:,1) appears in year_weak_elnino, or 0 if that element of comyearlatlong(:,1) does not appear in year_weak_elnino.
Reference: ismember
2 个评论
Voss
2022-7-13
No problem. Here's how you do it:
% ism is the yes/no (you may not actually need idx)
[ism,idx] = ismember(comyearlatlong(:,1),year_weak_elnino);
% get the year/lat/long data for el-nino years:
elnino_data = comyearlatlong(ism,:)
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