Re: Map function with 2 variables

*To*: mathgroup at smc.vnet.net*Subject*: [mg114963] Re: Map function with 2 variables*From*: kj <no.email at please.post>*Date*: Fri, 24 Dec 2010 04:12:50 -0500 (EST)*References*: <iev2ua$4v6$1@smc.vnet.net>

In <iev2ua$4v6$1 at smc.vnet.net> Jagra <jagra24891 at mypacks.net> writes: >I have a problem that comes up in a couple of situations and I've >never found the right solution. I hoped I could get an idea of how to >generally address these kinds of things. >Say I have a function with two variables, something like a >SpearmanRankCorrelation[] from the MultiVariate Statistics package: >I also have matrix "m" with dimensions {3, 100} >m = RandomReal[{0, 1}, {3, 100}]; >Now, say I want to create a correlation matrix using the >SpearmanRankCorrelation function. >I can get the rank correlations between a single vector of the matrix >and all the other vectors like this: >SpearmanRankCorrelation[m[[1]], #] & /@ m >This would give me a single row in a correlation matrix. Pretty >straightforward, but now I want all 3 rows like I would get with this: >{SpearmanRankCorrelation[m[[1]], #] & /@ m, >SpearmanRankCorrelation[m[[2]], #] & /@ m, >SpearmanRankCorrelation[m[[3]], #] & /@ m} >There must be a way I can do this more directly. >I must be missing something simple. Try Outer[SpearmanRankCorrelation, m, m, 1] ~kj