'Find' function doesn't get me all required values
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Bianca Elena Ivanof
le 28 Avr 2016
Commenté : Star Strider
le 30 Avr 2016
Hello,
I am trying to use the 'find' function in order to locate some data-points that I need to exclude (erase all (:,25)>100)
It works, in that I get back 5 rows in column 25 that are indeed problematic - yet, I've found an additional one, bigger than 100, that 'find' doesn't seem to... find (the problematic :,25 I've found by merely scrolling down the matrix is not among the aforementioned 5 rows MATLAB finds).
I can't seem to get my head around what the problem is so could you please help me with any ideas?
4 commentaires
Image Analyst
le 28 Avr 2016
Modifié(e) : Image Analyst
le 28 Avr 2016
AGAIN, what is your array? Bianca, we don't have your all_operant_data, so how can we help? Type this on the command line and then paste the result back here:
probability_judgment
and also tell us the exact row numbers that you think find() should return.
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Star Strider
le 28 Avr 2016
Modifié(e) : Star Strider
le 28 Avr 2016
We would have to see your code, your matrix, and a bit more detail as to what you want to do. ‘Logical indexing’ rather than using find (unless you need the actual index numbers) might be easier.
EDIT — (15:35 GMT, 2013 04 28)
When I run this:
D = load('Bianca Elena Ivanof probability_judgment.mat');
M = D.probability_judgment;
GT100 = sum(M > 100)
GE100 = sum(M >= 100)
I get:
GT100 =
5
GE100 =
256
The 5 values that seem to meet your criterion are:
111
660
7030
1575
4020
Which one isn’t on this list? I’ve not seen any evidence that MATLAB’s comparison functions are inaccurate. I doubt that floating-point approximation error could account for the discrepancy you see. Use format short g to look at your vector.
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