MATLAB: Extract values within interquartile range in array

arraystatistics

Hi,

I want to extract values within an interquartile range in an array. Let say that the array looks as follows: v= [1 2 3 4 5 6 ……95 96 97 98 99]. The interquartile range is 25 and 75. How can I extract the array values from 25 to 75 to a new array? If possible, can I select other ranges than bottom and top 25%?

Thanks!

Best Answer

Use the quantile command to get whichever quantiles you want.

Then extract using logical indexing (as described on this documentation page).

v = 1:99;
q = quantile(v,[0.25 0.75])
v2 = v(v>q(1) & v<q(2))

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MATLAB: Lognormal distribution between a specific range

Here is some code that does roughly what you asked for.

r = lognrnd(8.6,0.2,100000,1);
figure
histfit(r);
skewness(r)

The red curve is the normal curve fit to the randomly generated data. The skew is evident, with a skewness of about 0.6.

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histcounts or the older histc.

Note that the two functions have different results for values that are exactly equal to the last element of the vector of bins. histc uses a separate bin for values exactly equal to the last bin but histc makes it part of the previous bin.

Best Answer

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