Extracting Data above a specifc year

Question

JMG 2021-7-15

评论： JMG 2021-7-15

Hello I am trying to figure out the best way to keep only the data from the year 1981 and up. I was thinking of doing something like this:

load('dataFC21.mat');
dataFC21.Year=year(dataFC21.Date);
[g,id]=findgroups(dataFC21.Year);
idx=(id>=1981);
dataFC21=dataFC21(idx,:);

Except that this isnt working. If someone could tell me what the issue with my code is or suggest a better method that would be great thanks!

Answer 1

dpb 2021-7-15

idx isn't the year; it's an index into the array by year.

Simply

yrWant=1981;
dWant=dataFC21(dataFC21.Year>=yrWant,:);

will return those rows presuming that dataFC21.Year is indeed the calendar year and is a double.

JMG 2021-7-15

Oh perfect thank you for the help!