Hai Alauda,<br><br> If you are using grads version 2 or above, then you can use sdfwrtie command for writing output. Then grads will write output on netcdf file so that you dont have to bother about the ctl file. A sample gs file is attached with this mail. <br>
<br>KrishnaMohan<br><br>-- <br>Krishnamohan.K.S<br>Junior Research Fellow<br>Department Of Atmospheric Sciences<br>Cochin University of Science and Technology<br>Cochin,India<br><br><br><div class="gmail_quote">On Thu, Jun 17, 2010 at 3:39 AM, Alauda arvensis <span dir="ltr"><<a href="mailto:a.arvensis@gmail.com">a.arvensis@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">Dear GrADS users,</span></p>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">I wish to open a GrADS file (test.ctl) and save one variable to a different file (out4.ctl). For this purpose I type the following:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">open test.ctl</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">set fwrite out4.dat</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">set gxout fwrite </span></p>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">d var130</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">I now have a binary file called "out4.dat" which contains my variable "var130". To open it in GrADS I need to create the respective .ctl-file. I copy it from test.ctl and make a few changes (see both test.ctl and out4.ctl below). I can open "out4" in GrADS and display "var130". Unfortunately the data does not display correctly: all longitude values are displayed correctly but all latitude values are upside down, comparible to the effect of a mirrow.</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">My questions:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">(1) Why is my data not displaying correctly and what do I need to do to fix this?</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">(2) Is it possible to save more than 1 variable in a binary file? I tried this by applying the steps above and typing after "d var130" also "d var157". I then apply the respective changes in the .ctl-file (i.e. VARS 2 and var157 14 157,100 var157). However, I can only display "var130" and not "var157".</span></p>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">(3) Is this methodology (fwrite) the best way to save changes after the manipulation of a GrADS file?</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">Thank you very much in advance.</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"> </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">With kind regards,</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">Chris</span></p>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"> </span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">###################################</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">test.ctl</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">* Generated by CDO version 1.4.0</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">*</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">DSET ^test.grb</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">DTYPE GRIB</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">INDEX ^test.gmp</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">XDEF 55 LINEAR 270.000000 1.125000</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">YDEF 47 LEVELS -40.934 -39.813 -38.691 -37.570 -36.448 -35.327 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-34.205 -33.084 -31.962 -30.841 -29.719 -28.598 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-27.476 -26.355 -25.234 -24.112 -22.991 -21.869 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-20.748 -19.626 -18.505 -17.383 -16.262 -15.140 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-14.019 -12.897 -11.776 -10.654 -9.533 -8.411 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-7.290 -6.168 -5.047 -3.925 -2.804 -1.682 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-0.561 0.561 1.682 2.804 3.925 5.047 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">6.168 7.290 8.411 9.533 10.654 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">ZDEF 14 LEVELS 1000 925 850 700 500 400 300 250 200 150 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">100 70 50 30 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">TDEF 4 LINEAR 00:00Z01jan1960 1dy</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">TITLE test.grb T31 grid</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">OPTIONS yrev</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">UNDEF -9e+33</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">VARS 5</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">var130 14 130,100 var130</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">var157 14 157,100 var157</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">var129 14 129,100 var129</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">var131 14 131,100 var131</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">var132 14 132,100 var132</span></p>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">ENDVARS</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"><span style="font-size: 10pt;" lang="EN-US">###################################</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"><span style="font-size: 10pt;" lang="EN-US"></span></span> </div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">out4.ctl</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US"></span> </div>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">* Generated by CDO version 1.4.0</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">*</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">DSET ^out4.dat</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">XDEF 55 LINEAR 270.000000 1.125000</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">YDEF 47 LEVELS -40.934 -39.813 -38.691 -37.570 -36.448 -35.327 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">-34.205 -33.084 -31.962 -30.841 -29.719 -28.598 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-27.476 -26.355 -25.234 -24.112 -22.991 -21.869 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-20.748 -19.626 -18.505 -17.383 -16.262 -15.140 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-14.019 -12.897 -11.776 -10.654 -9.533 -8.411 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-7.290 -6.168 -5.047 -3.925 -2.804 -1.682 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">-0.561 0.561 1.682 2.804 3.925 5.047 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">6.168 7.290 8.411 9.533 10.654 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">ZDEF 14 LEVELS 1000 925 850 700 500 400 300 250 200 150 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">100 70 50 30 </span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">TDEF 4 LINEAR 00:00Z01jan1960 1dy</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">TITLE out4.dat</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">OPTIONS yrev</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;" lang="EN-US">UNDEF -9e+33</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">VARS 1</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">var130 14 130,100 var130</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal;"><span style="font-size: 10pt;">ENDVARS</span></p>
<p> </p>
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<br></blockquote></div><br><br clear="all"><br><br>