Re: how to change the Z axis ranges without change the plot?

[Jaison Kurian <jaison@xxxxxxxxxxxxxxxxxx>]

Hi Zibiao Zhang,

you wrote : define axis/z=-50:0:-10

As Ansley suggested this defenition is not complete ==> axis name is 
missing. By regridding to a new properly defined axis, you can get 
the variable ploted with actual depth values insted of fractional values.

Here is a detailed example.


\ cancel mode verify

! suppose actual depth points are 0,10,20,30....100
! so that the fractions will be 0,0.1,0.2,0.3,....1

! first we will define an axis with "fractional" depth
!    the /DEPTH qualifier will make the z-axis "positive=down"

define axis/z=0:1:0.1/DEPTH zfra
define axis/t=1:25:1  tax         ! dummy t-axis
define grid/z=zfra/t=tax grd      ! grid with t & z axis 

! let us get some data with z-axis "zfra". function randu generates
!    pseudo-random values

let var_fr = randu(Z[G=grd]) + randu(T[G=grd]) ! in your case var_fr = 
your variable
			  	           ! with fractional z-axis

! now we can define a depth axis which will have actual depth values
! we know depth at which depth fraction is 1 is 100 ..hence z-axis 
!   low, high & delta are
!   0*100 = 0, 1*100 = 100 & 0.1*100 = 10

define axis/z=0:100:10/DEPTH/units=meters zax

!now we can directly regrid our var_fr to this new axis as "var"
! @asn will blindly associate the varialbe values to the new z values
! (the number of depth points in both z-axes are the same)
! you can use this kind of an axis even if your fractional axis is 
! "positive=up"

let/title="var_fr with actual depth"/units="meters" var = var_fr[GZ=zax@asn]

contour var


Hope this helps

With Regards 

Jaison



On Tue, 6 Apr 2004, Zibiao Zhang wrote:

> Hi, I plotted a contour of temperature with depth and time, however my depth is in fraction of total depth. 
> how can I change the z axis to real depth without change the plot itself? 
> also when I use define axis/z=-50:0:-10, it gave me the error: invalid command: defien what name?
> anybody knows what happens?
> 

-- 
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    Jaison Kurian                           
    Centre for Atmospheric and Oceanic Sciences
    Indian Institute of Science
    B A N G A L O R E   560 012
    Ph: +91-80-3942505
        +91-80-3600450
    Fax:+91-80-3600865
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