[gradsusr] scorr function

[Carlos Batista]

Stephen McMillan

Ok, Thank's for help!!!

Carlos Batista


2010/4/24 Stephen McMillan <smcmillan at planalytics.com>

> Dear Krlos,
> If you haven't already, first review the correct syntax and example in the
> GrADS Documentation Index:
> http://sidata.org/grads/gadoc/gradfuncscorr.html
> Other functions can be found in the same Documentation Index.
>
> The basic idea is that you have two previously defined variables, whose
> horizontal dimensions both include the geographical area you wish to
> spatially correlate.  For example, let's say you have two variables var1 and
> var2 and you wanted to correlate them over a 10 x 10 degree domain over
> somewhere at a fixed time:
> 'd scorr(var1,var2,lon=-90,lon=-80,lat=30,lat=40)'
> should give you something like this:
> result value = -0.2356
> You could capture above value in script by including this after display
> command:
> corr=subwrd(result,4)
> You can also create a time loop of correlations, 50 timesteps for example:
> 'set t 1 50'
> 'd tloop(scorr(var1,var2,....)'
> Create a correlation time series of above loop:
> 'define corrts=tloop(scorr(var1,var2,...)'
> Display the time series:
> 'set x 1';'set y 1'
> 'd corrts'
>
> The tcorr function (see http://sidata.org/grads/gadoc/gradfunctcorr.html)
> may be more appropriate for correlating your data, especially if they are
> time series at a fixed point.
>
> A search of the GrADS user archive (
> http://gradsusr.org/pipermail/gradsusr/) may yield more
> appropriate answers.
>
> Best wishes--
> Stephen McMillan
>
> On Sat, Apr 24, 2010 at 10:02 AM, Carlos Batista <krlosbatist at gmail.com>wrote:
>
>> Dear all,
>> Kindly tell me how to use the "scorr " function of grads.
>> I don't how use its this function for to do correlation between
>> precipitation and flow rivers. Someone know some gs for to do correlations
>> between this data, please, useding the scorr function and other functions ?
>> Any suggestions
>> Krlos
>> e-mail; krlosbatist at gmail.com
>>
>>
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>>
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