Determining how many identical values?
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Jonathan Wong
le 26 Avr 2015
Réponse apportée : Image Analyst
le 26 Avr 2015
Let's say that I have an array of size n and each value in the array is a randomly generated value from 1 to 100. I'll use randi for this.
randi(100,n,1)
For example, lets says the array were a size 7 and the generated matrix was [30 17 94 28 28 19 19]. I want a method that can output a value of 4 since there area total of 4 values that are identical to another within the array. What is a simple though not necessarily the most efficient way of determining how the number of values that are identical?
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Image Analyst
le 26 Avr 2015
They've been making lots of changes to the histogram routines over the last couple of versions, which makes it harder/longer for us to give answers to questions like yours. Assuming you have a recent version, you can use histcounts() and sum the bins that have counts of 2 or more:
n = 7
r = randi(100,n,1)
% Test case
r = [30 17 94 28 28 19 19]
[counts, edges] = histcounts(r, min(r):max(r)) % a new function!
binsOfDuplicates = counts >= 2
numDuplicates = sum(counts(binsOfDuplicates))
If you have an old version, you can use histc(), which has now been deprecated:
n = 7
r = randi(100,n,1)
% Test case
r = [30 17 94 28 28 19 19]
counts = histc(r, min(r):max(r))
binsOfDuplicates = counts >= 2
numDuplicates = sum(counts(binsOfDuplicates))
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