[gradsusr] plot the average wind vector

[Yi-Chih Huang]

Jeff,

    Thanks much for the response.  However, both ways are not working as
follows.  I am wondering why it is so hard to show the average wind vectors?

    Thanks,

                       Yi-Chih

###############################################
ga-> define uave = aave(u, x=65, x=93, y=37, y=65)
Define memory allocation size = 8 bytes
ga-> define vave = aave(v, x=65, x=93, y=37, y=65)
Define memory allocation size = 8 bytes
ga-> set gxout vector
ga-> d uave;vave
Result value = 0.995036

###############################################
ga-> test.gs
Warning:  defined name not found
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Syntax Error:  Invalid Operand
  'u_value' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = u_value


On Wed, Nov 9, 2011 at 3:55 PM, Jeffrey Duda <jdduda at iastate.edu> wrote:

> Yi-Chih,
> The two things I would try are:
> 1) Instead of displaying the areal average using "d aave...", try defining
> the variable as the output of aave like this:
> "define uave = aave(u, x=65, x=93, y=37, y=65)"
> "define vave = aave(v, x=65, x=93, y=37, y=65)"
> "set gxout vector"
> "d uave;vave"
>
> 2) If (1) doesn't work, use the set defval<http://www.iges.org/grads/gadoc/gradcomdsetdefval.html>command to individually set the value of the component fields by using the
> two aave commands, one for each component.  That is, try something like:
> ii = 65
> jj = 37
> ii_max = 93
> jj_max = 65
> 'd aave(u, x=65, x=93, y=37, y=65)'
> u_value = subwrd(result,4)
> 'd aave(v, x=65, x=93, y=37, y=65)'
> v_value = subwrd(result,4)
> while (ii <= ii_max)
>    while (jj <= jj_max)
>       'set defval uave 'ii' 'jj' 'u_value
>       'set defval vave 'ii' 'jj' v_value
>       jj = jj + 1
>    endwhile
>    ii = ii + 1
> endwhile
>
> 'd uave;vave'
>
> Jeff Duda
>
> On Tue, Nov 8, 2011 at 10:50 AM, Yi-Chih Huang <dscpln at gmail.com> wrote:
>
>> Hello,
>>
>>     I am trying to plot the average wind vector over a horizontal range.
>> But I can't get an arrow, but only a value at most as below.  Could anyone
>> tell me the right commands to show the average wind vector over a
>> horizontal range?
>>
>> ga-> d aave(u, x=65, x=93, y=37, y=65);aave(v, x=65, x=93, y=37, y=65)
>> Result value = -3.55342
>> ga-> d amean(u, x=65, x=93, y=37, y=65);amean(v, x=65, x=93, y=37, y=65)
>> Result value = -3.56684
>> ga-> d ave(u, x=65, x=93, y=37, y=65);ave(v, x=65, x=93, y=37, y=65)
>> Error from AVE: Invalid option flags
>> Operation Error:  Error from ave function
>>   Error ocurred at column 1
>> DISPLAY error:  Invalid expression
>>   Expression = ave(u,x=65,x=93,y=37,y=65)
>>
>>     Thanks much,
>>
>>                    Yi-Chih
>>
>> _______________________________________________
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>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
> --
> Jeff Duda
> Iowa State University
> Meteorology Graduate Student
> www.meteor.iastate.edu/~jdduda <http://www.meteor.iastate.edu/%7Ejdduda>
>
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>
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