Quantile subroutine, Fortran 90

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SUMMARY

The forum discussion centers on the need for a quantile subroutine in Fortran 90. The user, natski, seeks a method to calculate quantiles from a 1-D array, specifically requesting a function call like "call quantile(array,0.5D0,value)" to obtain the median. Another user suggests utilizing existing sorting routines in Fortran 90, recommending to sort the array, determine its size, and access the appropriate data point for the desired quantile. This approach effectively addresses the user's requirement using built-in capabilities of the language.

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natski
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Hi all,

I have been Googling for a Fortran 90 quantile routine but to no avail...

I need a subroutine to which one passes an 1-D array plus the quantile range required...

e.g.

"call quantile(array,0.5D0,value)"

would give me the median of array. Does anyone know of a handy (and free) F90 script to accomplish this?

Thanks,

natski
 
Last edited:
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Just use one of the many sorting routines that are available. Then get the SIZE(array), divide that number of by 2, round and get the data point at that location.
 
Yup was just about to post that I'd done exactly that :-)
 

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