How to avoid loops

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Bruce
Bruce 2018-2-22
评论： Star Strider 2018-2-22
I have an array (3xN, day, longitude, temperature), a vector (10 elements long, TestLongitudes), and a longitude tolerance. I'm attempting to, for each day find the longitudes that are with tolerance of any of the TestLongitudes, and return the mean of the temperatures that meet the criteria. I can write a lot of loops to do the comparisons, but I wonder if there's a better way...
Thanks! Bruce

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回答（1 个）

Star Strider
Star Strider 2018-2-22
With respect to comparing the longitudes, the ismembertol function comes quickly to mind. You will have to experiment with it and your data to determine if it’s an appropriate option.
You won’t be avoiding loops, just hiding them. Many of these functions have implicit loops within them.
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Bruce
Bruce 2018-2-22
You are, of course, correct about the loops. My assumption is that Mathworks can do it more efficiently than I can :-).
I'll take a look at ismembertol to see if it'll do what I want. Thanks!
Star Strider
Star Strider 2018-2-22
It can. The functions are optimised, and I believe in many functions, compiled.
My pleasure!

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