Hi,
When defining your Y axis, do not use both /NPOINTS and the list of points yaxis=ypoints[i=1:3049]. What that is doing is taking just the first 55 points in the list and using them. What you tried in your first email was the right idea.This happened because ypoints[I=1:3049:55] is decreasing not increasing. The error message should really say,
yes? LET total = `ypoints,RETURN=isize`
!-> DEFINE VARIABLE total = 3049
yes? DEFINE AXIS/Y/UNITS=degrees_south yaxis=ypoints[I=1:`total`:`npts`]
!-> DEFINE AXIS/Y/UNITS=degrees_south yaxis=ypoints[I=1:3049:55]
**ERROR: improper grid or axis definition: data for DEFINE AXIS/FROM_VARIABLE is not monotonic
**ERROR: improper grid or axis definition: data for DEFINE AXIS/FROM_VARIABLE is not monotonically increasing.
yes? list ypoints[I=1:3049:55]
VARIABLE : YPOINTS
regrid: 55 delta on X
FILENAME : temp.dat
SUBSET : 56 points (X)
1 / 1: 20.00
56 / 2: 19.96
111 / 3: 19.92
166 / 4: 19.88
221 / 5: 19.83
276 / 6: 19.79
331 / 7: 19.75
So multiply by -1 to make it an increasing list, and define the axis in units of degrees north with negative values.
yes? DEFINE AXIS/Y/UNITS=degrees_north yaxis=(-1)*ypoints[I=1:`total`:`npts`]And I think you'll be able to define the grid and read the temperature data on that grid.
Ansley
On 5/2/2013 3:02 AM, surja kanta Mishra wrote:
Thanks for replyNow the new problem coming while I am trying temperature contour pot as
DEFINE AXIS/Y/UNITS=degrees_south/npoints=`npts` yaxis=ypoints[I=1:`total`]
!-> DEFINE AXIS/Y/UNITS=degrees_south/npoints=55 yaxis=ypoints[I=1:3049]
*** NOTE: Axis has repeated values -- micro-adjusting ...
can da temp.dat
DEFINE GRID/X=xaxis/Y=yaxis xygrid
FILE/VAR="temp_x, temp_y,temp"/GRID=xygrid temp.dat
sh gr temp
GRID XYGRID
name axis # pts start end
XAXIS LONGITUDE 55mi 86.666E(86.667) 92.583E(92.583)
YAXIS LATITUDE 55 r 20N 19.999N
normal Z
normal T
list/I=30:35/J=20:25 temp
VARIABLE : TEMP
FILENAME : temp.dat
SUBSET : 6 by 6 points (LONGITUDE-LATITUDE)
88.416E88.458E88.5E 88.541E88.583E88.625E
30 31 32 33 34 35
/ 25: 0.792 0.391 -0.475 -0.475 -0.866 -1.139
/ 24: -0.561 -0.471 -0.313 -0.244 -0.342 -1.130
/ 23: -0.367 -0.341 -0.518 -0.998 -1.088 -1.197
/ 22: -0.716 -0.729 -0.587 -0.088 -0.527 -1.140
/ 21: 0.619 -0.095 -0.314 -1.212 -1.259 -1.259
/ 20: -0.393 -0.173 -0.404 -0.080 -1.269 -1.776
shade temp
**ERROR: illegal limits: TEMP is not in the range Y=20N:20N
Axis extremes are Y=20N:20N
On 2 May 2013 14:46, Akshay Hegde <akshay.k.hegde@xxxxxxxxx> wrote:
- Akshay HegdeDear Mishratry this
file/var="xpoints,ypoints" temp.dat
let xdif = xpoints[I=@DDF]
let xcross = xdif[I=@EVNT:0.0415]list/i=1:5 xpoints,xdif,xcross
LET npts = `xcross[I=@LOC:1]`
DEFINE AXIS/X/UNITS=degrees_east xaxis = xpoints[I=1:`npts`]LET total = `ypoints,RETURN=isize`
DEFINE AXIS/Y/UNITS=degrees_south/npoints=`npts` yaxis=ypoints[I=1:`total`]
sh axis y/yaxis
! Works try this
def grid/x=xaxis/y=yaxis mygrid
sh g mygrid
On Thu, May 2, 2013 at 1:38 PM, surja kanta Mishra <surmat84@xxxxxxxxx> wrote:
Dear all,
while I am trying to convert an ASCII file to Netcdf file for contour plot of temperature. I have tried as an example is in the following link :
http://ferret.pmel.noaa.gov/Ferret/faq/reading-ascii-data-representing-a-grid
The error is coming as
yes? file/var="xpoints,ypoints" temp.dat
yes? let xdif = xpoints[I=@DDF]
yes? let xcross = xdif[I=@EVNT:0.0415]
yes? list/i=1:5 xpoints,xdif,xcross
Column 1: XPOINTS
Column 2: XDIF is XPOINTS[I=@DDF]
Column 3: XCROSS is XDIF[I=@EVNT:0.0415]
XPOINTS XDIF XCROSS
1 / 1: 86.67 0.042 0.000
2 / 2: 86.71 0.042 0.000
3 / 3: 86.75 0.042 0.000
4 / 4: 86.79 0.042 0.000
5 / 5: 86.83 0.375 0.000
yes? LET npts = `xcross[I=@LOC:1]`
!-> DEFINE VARIABLE npts = 55
yes? DEFINE AXIS/X/UNITS=degrees_east xaxis = xpoints[I=1:`npts`]
!-> DEFINE AXIS/X/UNITS=degrees_east xaxis = xpoints[I=1:55]
yes? LET total = `ypoints,RETURN=isize`
!-> DEFINE VARIABLE total = 3049
yes? DEFINE AXIS/Y/UNITS=degrees_south yaxis=ypoints[I=1:`total`:`npts`]
!-> DEFINE AXIS/Y/UNITS=degrees_south yaxis=ypoints[I=1:3049:55]
**ERROR: improper grid or axis definition: data for DEFINE AXIS/FROM_VARIABLE is not monotonic
temperature data in ascii format is in attached file.
Please help me.
Surja
--
Surja...Surja Kanta Mishra...........................................................................................Junior Research Fellow (CSIR-NET, Funded by UGC)School of Oceanographic StudiesJadavpur UniversityKolkata - 700032India.
Contacts: +91 9681091928Alternate E-mail: sur_km@xxxxxxxxxxx
--
Surja...Surja Kanta Mishra...........................................................................................Junior Research Fellow (CSIR-NET, Funded by UGC)School of Oceanographic StudiesJadavpur UniversityKolkata - 700032India.
Contacts: +91 9681091928Alternate E-mail: sur_km@xxxxxxxxxxx