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From Schalk Cronjé <ysb...@gmail.com>
Subject Re: Apache Commons Math and Groovy -- Argument Type?
Date Sun, 03 Jan 2016 21:01:14 GMT
Change to double[] instead of Double[].


On 03/01/2016 20:50, Daniel Price wrote:
> Sorry, code sample:
>
> import org.apache.commons.math3.stat.correlation.Covariance
> import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics
> import org.apache.commons.math3.util.*
>
> Double[] dblArray1 = 
> [0.00995630918100443,0.00425329233495364,-0.01227651365617033,0.015574186166315451] 
> as Double[]
> Double[] dblArray2 = 
> [0.004630842339633734,0.003451971610807014,-0.008004809261582091,0.04068026756946197]

> as Double[]
> def cov = new Covariance().covariance(dblArray1, dblArray2)
> println "cov: $cov"
>
> Result:
> Exception in thread "main" groovy.lang.MissingMethodException: No 
> signature of method: 
> org.apache.commons.math3.stat.correlation.Covariance.covariance() is 
> applicable for argument types: ([Ljava.lang.Double;, 
> [Ljava.lang.Double;) values: [[0.00995630918100443, 
> 0.00425329233495364,...
> Possible solutions: covariance([D, [D), covariance([D, [D, boolean)
>
> So, how would I create the proper array argument: [D,[D ? Some Apache 
> Commons Math type I need to cast my java.lang.Double to?
>
> Any suggestions much appreciated!
> D
>
> On Sun, Jan 3, 2016 at 10:43 AM, Eric MacAdie <emacadie@gmail.com 
> <mailto:emacadie@gmail.com>> wrote:
>
>     Could you give a code sample?
>
>     = Eric MacAdie
>
>
>     On Sun, Jan 3, 2016 at 11:37 AM, Daniel Price
>     <danprice303@gmail.com <mailto:danprice303@gmail.com>> wrote:
>
>         Got this 2.4.5 Groovy error trying to perform a covariance calc:
>
>         groovy.lang.MissingMethodException: No signature of method:
>         org.apache.commons.math3.stat.correlation.Covariance.covariance()
>         is applicable for argument types: ([Ljava.lang.Double;,
>         [Ljava.lang.Double;)
>
>         covariance() requires two double arrays, and that's what I
>         provided, so what gives?
>
>         Do I need to cast the Groovy/Java array into another type?
>
>         Any advice is much appreciated!
>
>         D
>
>
>
>


-- 
Schalk W. Cronjé
Twitter / Ello / Toeter : @ysb33r


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