MATLAB Answers

BOB
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Find values outside of a range when calculating residuals.

Asked by BOB
on 3 Dec 2017
Latest activity Commented on by Star Strider
on 3 Dec 2017
Hi, I'm trying to find all my residuals above 3 and below minus 3 and extract the corresponding records to an excel sheet. I know there are 447 values which are outside of the range out of the total 14792.
My approach has been to use the find function to find all records within the range and then somehow make it so matlab returns all records outside this range, but I'm not familiar with how to do this and so was hoping for some help here.
The code I have so far is simply:
W=find(res>=-3 & res<3)
>> length(W)
ans =
14345
Where length(W) is the number of records within the range 3 to -3, whereas I need the other 447 values outside of this range.
The variable res is a 14972 x 1 double
Thanks for any help.

  2 Comments

Do you want to extract those values which lies between -3 and 3 and write in the excel file?
I want any records with residuals that do not lie in the range 3 to -3 thanks, so essentially the opposite.

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1 Answer

Answer by Star Strider
on 3 Dec 2017
 Accepted Answer

I would use ‘logical indexing’ here:
L = (res>=-3) & (res<3); % Logical Index Of ‘res’ Values Within Limits
In = W(L);
Out = W(~L);
If you need the indices, use find:
InIdx = find(L);
OutIdx = find(~L);

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