[gradsusr] fwrite on mac

[Qian, JianHua]

Jim,

The missing value is  –9.99e+08.   Thanks for your help!

Joshua

From: "James T. Potemra" <jimp at hawaii.edu<mailto:jimp at hawaii.edu>>
Organization: University of Hawaii
Reply-To: GrADS Users Forum <gradsusr at gradsusr.org<mailto:gradsusr at gradsusr.org>>
Date: Mon, 27 May 2013 13:26:51 -1000
To: GrADS Users Forum <gradsusr at gradsusr.org<mailto:gradsusr at gradsusr.org>>
Subject: Re: [gradsusr] fwrite on mac

Joshua:

I think your missing values were changed from -9999 to -9e+08 (or something very close to that).
You'll need to substitute that number in place of -9999 in your .ctl file.

Jim

On 5/27/13 3:26 AM, Qian, JianHua wrote:
Dear grads users,

I have trouble in using fwrite on a mac os x laptop.  I get the data written from fwrite, but when I plot the data (the correct values should be between 0 and about 100 mm/day), I got unrealistic number:
d pcp
Contouring: -9e+08 to 0 interval 1e+08

If I use "options little_endian", the number is of e+38.

This is how I used the fwrite in a gs file:

open /Users/jianhua_qian/Desktop/IRI/desktopdata/cmorph_indo/cmorph_indo.ctl
set fwrite -sq cmorph_03_13_son_mjo1.dat
%set fwrite -be cmorph_03_13_son_mjo1.dat   (I tried –be, but it does not work either)
set x 1 282
set y 1 301
set z 1
set gxout fwrite
 set t         2145
 d pcp
 set t         2146
 d pcp
 set t         2147
 d pcp
 set t         2148
 d pcp
…..

And my ctl file is as follows:

dset ^cmorph_03_13_son_mjo1.dat
title cmorph data 7dec2002to14may2013 mjo plases
options sequential
%options big_endian
undef  -9999.
xdef  282 linear 74.875 0.25
ydef  301 linear -40.125 0.25
zdef 1 levels 0
tdef  952 linear  00z07Dec2002 3hr
vars 1
pcp      0 99 mm/hr (00z data represents pcp of 00z to 03z)

-----
I tried big_endian,  little-endian, sequential, and biteswapped, but none works.

Could someone in the grads user group give me a clue?

Thanks!
Joshua Qian




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