| Re: Missing fill colours in contour plot [message #82776] |
Thu, 17 January 2013 10:02  |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
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ljs15@fsmail.net writes:
> P.S. I never realised there were Brewer colour tables. Whenever I've wanted blue-white-red I've always created my own. This will make my life much easier!
Yes, so will a lot of other Coyote Library routines. ;-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: Missing fill colours in contour plot [message #82779 is a reply to message #82776] |
Thu, 17 January 2013 09:34  |
Sir Loin Steak
Messages: 42
Registered: January 2012
|
Member |
|
|
On Wednesday, January 16, 2013 2:57:39 PM UTC, David Fanning wrote:
> ljs15@fsmail.net writes:
>
>
>
>> The reason for specifying the contours is that the data range from positive to negative values, and I'm using a blue-white-red colour scale to plot (+ve is red, -ve is blue).
>
>>
>
>> In order to make sure white represents 0, I need to set the contour levels to span the maximum range. So if the data had minv = -20 and maxv = +50, I want the contours to range from -50 to +50.
>
>>
>
>> There may be a better way of doing it than what I'm doing though!
>
>
>
> Well, I would do it like this:
>
>
>
>
>
> maxval = Max(Abs(array))
>
> clevels = Scale_Vector(Findgen(ncont), Floor(-maxval), Ceil(maxval))
>
> cgLoadCT, 22, /Brewer, /Reverse, NCOLORS=ncont, BOTTOM=1
>
> ccols = Bindgen(ncont)+1B
>
>
>
> Cheers,
>
>
>
> David
>
>
>
> --
>
> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")
Much neater than my hackneyed version. I'll revert to this method - thanks David.
P.S. I never realised there were Brewer colour tables. Whenever I've wanted blue-white-red I've always created my own. This will make my life much easier!
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| Re: Missing fill colours in contour plot [message #82801 is a reply to message #82779] |
Wed, 16 January 2013 06:57 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
ljs15@fsmail.net writes:
> The reason for specifying the contours is that the data range from positive to negative values, and I'm using a blue-white-red colour scale to plot (+ve is red, -ve is blue).
>
> In order to make sure white represents 0, I need to set the contour levels to span the maximum range. So if the data had minv = -20 and maxv = +50, I want the contours to range from -50 to +50.
>
> There may be a better way of doing it than what I'm doing though!
Well, I would do it like this:
maxval = Max(Abs(array))
clevels = Scale_Vector(Findgen(ncont), Floor(-maxval), Ceil(maxval))
cgLoadCT, 22, /Brewer, /Reverse, NCOLORS=ncont, BOTTOM=1
ccols = Bindgen(ncont)+1B
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: Missing fill colours in contour plot [message #82802 is a reply to message #82801] |
Wed, 16 January 2013 06:47 |
Sir Loin Steak
Messages: 42
Registered: January 2012
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Member |
|
|
On Wednesday, January 16, 2013 2:34:52 PM UTC, David Fanning wrote:
> ljs15@fsmail.net writes:
>
>
>
>> Right, I've just done some more checking, and when I specify the colour values to range from 0-255 it works, but when I set them to range from 0-250 it doesn't. The two plots are shown at http://www.physics.open.ac.uk/~lsteele/contour2.
>
>>
>
>> In the two plots shown, the left is done using ccol=floor(findgen(ncont)/(ncont-1)*255) and the right is done using ccol=floor(findgen(ncont)/(ncont-1)*250), with ncont=30. So, the only change is going from 255 to 250, with the contours being correct at 255.
>
>>
>
>> Does anyone know why this would be causing a problem?
>
>
>
> I think you have a fairly odd way of selecting colors and contours,
>
> which is causing a mismatch between the contours, the data, and the
>
> colors. What happens if you set the contours and colors up this way:
>
>
>
> minv = Floor(min(array))
>
> maxv = Ceil(max(array))
>
> ncont = 30
>
> clevels = Findgen(ncont) * ((maxv - minv) / ncont) + minv
>
> LoadCT, 25, NCOLORS=ncont, BOTTOM=1
>
> ccol= Bindgen(ncont)+1B
>
>
>
> Cheers,
>
>
>
> David
>
> --
>
> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")
Hi David.
The reason for specifying the contours is that the data range from positive to negative values, and I'm using a blue-white-red colour scale to plot (+ve is red, -ve is blue).
In order to make sure white represents 0, I need to set the contour levels to span the maximum range. So if the data had minv = -20 and maxv = +50, I want the contours to range from -50 to +50.
There may be a better way of doing it than what I'm doing though!
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| Re: Missing fill colours in contour plot [message #82803 is a reply to message #82802] |
Wed, 16 January 2013 06:34 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
ljs15@fsmail.net writes:
> Right, I've just done some more checking, and when I specify the colour values to range from 0-255 it works, but when I set them to range from 0-250 it doesn't. The two plots are shown at http://www.physics.open.ac.uk/~lsteele/contour2.
>
> In the two plots shown, the left is done using ccol=floor(findgen(ncont)/(ncont-1)*255) and the right is done using ccol=floor(findgen(ncont)/(ncont-1)*250), with ncont=30. So, the only change is going from 255 to 250, with the contours being correct at 255.
>
> Does anyone know why this would be causing a problem?
I think you have a fairly odd way of selecting colors and contours,
which is causing a mismatch between the contours, the data, and the
colors. What happens if you set the contours and colors up this way:
minv = Floor(min(array))
maxv = Ceil(max(array))
ncont = 30
clevels = Findgen(ncont) * ((maxv - minv) / ncont) + minv
LoadCT, 25, NCOLORS=ncont, BOTTOM=1
ccol= Bindgen(ncont)+1B
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: Missing fill colours in contour plot [message #82809 is a reply to message #82804] |
Wed, 16 January 2013 02:28 |
Sir Loin Steak
Messages: 42
Registered: January 2012
|
Member |
|
|
On Wednesday, January 16, 2013 9:51:49 AM UTC, lj...@fsmail.net wrote:
> On Wednesday, January 16, 2013 12:11:50 AM UTC, tortoise...@gmail.com wrote:
>
>> On Tuesday, 15 January 2013 22:14:04 UTC, Coyote wrote:
>
>>
>
>>> On Tuesday, January 15, 2013 1:56:23 PM UTC-7, lj...@fsmail.net wrote:
>
>>
>
>>>
>
>>
>
>>>> I am trying to do a contour plot of a latitude-longitude array, but I keep getting gaps in my plot, as shown in the following image: http://www.physics.open.ac.uk/~lsteele/contour.png. I'm stumped as to the reason, as it's not as if it's missing contours at the very end ranges of the contour values - it's somewhere in between. Anyhow, I'm sure the knowledgable folks on here will know!
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> I have defined a blue-white-red colour scheme and loaded it in with tvlct, but the problem occurs with other colour schemes too. I am calculating my contour levels and colours as follows (with ncont the number of contours I'm plotting):
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> minv = floor(min(array))
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> maxv = ceil(max(array))
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> maxval = max([abs(array),abs(array)])
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> clevels = -maxval + findgen(ncont)/(ncont-1)*2*maxval
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> ccol = floor(findgen(ncont)/(ncont-1)*250)
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> I am then plotting my contour plot as:
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> device, decomposed=0
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> bwr_colour, red_vec, grn_vec, blu_vec
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> tvlct, red_vec, grn_vec, blu_vec
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> contour, array, lon, lat, $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> levels=clevels, c_colors=ccol, /fill, $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> background=cgColor('white'), color=cgColor('black'), $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> xrange=[-180,180], yrange=[-90,90], xstyle=1, ystyle=1, $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> yticks=6, ytickv=[-90,-60,-30,0,30,60,90], $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> xticks=6, xtickv=[-180,-120,-60,0,60,120,180], $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> xtitle='Longitude', ytitle='Latitude', charsize=1.5, $
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> title=plotsym+' (all motions) / g m!u-1!n s!u-1!n'
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>>
>
>>
>
>>>
>
>>
>
>>>> If anyone can offer any suggestions then I'll be very grateful, as it's bugging me now!
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> Just seeing "lon", "lat", and "contour" causes me to think that one of your problems is that you should be using the CELL_FILL keyword, rather than the FILL keyword.
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> http://www.idlcoyote.com/color_tips/fill_colors.html
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> If that doesn't work, I'd try cgCONTOUR. That routine will fill up the "normal" hole Contour creates.
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> http://www.idlcoyote.com/tips/contour_hole.php
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> Cheers,
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> David
>
>>
>
>>
>
>>
>
>> Thanks David - I'll give both a try tomorrow and see what happens!
>
>
>
> Hmm, well neither cell_fill nor cgcontour fix the problem. I'll have to have another fiddle and see what I can do, but it seems like it should work!
Right, I've just done some more checking, and when I specify the colour values to range from 0-255 it works, but when I set them to range from 0-250 it doesn't. The two plots are shown at http://www.physics.open.ac.uk/~lsteele/contour2.
In the two plots shown, the left is done using ccol=floor(findgen(ncont)/(ncont-1)*255) and the right is done using ccol=floor(findgen(ncont)/(ncont-1)*250), with ncont=30. So, the only change is going from 255 to 250, with the contours being correct at 255.
Does anyone know why this would be causing a problem?
Cheers,
Liam
|
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| Re: Missing fill colours in contour plot [message #82812 is a reply to message #82809] |
Wed, 16 January 2013 01:51 |
Sir Loin Steak
Messages: 42
Registered: January 2012
|
Member |
|
|
On Wednesday, January 16, 2013 12:11:50 AM UTC, tortoise...@gmail.com wrote:
> On Tuesday, 15 January 2013 22:14:04 UTC, Coyote wrote:
>
>> On Tuesday, January 15, 2013 1:56:23 PM UTC-7, lj...@fsmail.net wrote:
>
>>
>
>>> I am trying to do a contour plot of a latitude-longitude array, but I keep getting gaps in my plot, as shown in the following image: http://www.physics.open.ac.uk/~lsteele/contour.png. I'm stumped as to the reason, as it's not as if it's missing contours at the very end ranges of the contour values - it's somewhere in between. Anyhow, I'm sure the knowledgable folks on here will know!
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> I have defined a blue-white-red colour scheme and loaded it in with tvlct, but the problem occurs with other colour schemes too. I am calculating my contour levels and colours as follows (with ncont the number of contours I'm plotting):
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> minv = floor(min(array))
>
>>
>
>>>
>
>>
>
>>> maxv = ceil(max(array))
>
>>
>
>>>
>
>>
>
>>> maxval = max([abs(array),abs(array)])
>
>>
>
>>>
>
>>
>
>>> clevels = -maxval + findgen(ncont)/(ncont-1)*2*maxval
>
>>
>
>>>
>
>>
>
>>> ccol = floor(findgen(ncont)/(ncont-1)*250)
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> I am then plotting my contour plot as:
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> device, decomposed=0
>
>>
>
>>>
>
>>
>
>>> bwr_colour, red_vec, grn_vec, blu_vec
>
>>
>
>>>
>
>>
>
>>> tvlct, red_vec, grn_vec, blu_vec
>
>>
>
>>>
>
>>
>
>>> contour, array, lon, lat, $
>
>>
>
>>>
>
>>
>
>>> levels=clevels, c_colors=ccol, /fill, $
>
>>
>
>>>
>
>>
>
>>> background=cgColor('white'), color=cgColor('black'), $
>
>>
>
>>>
>
>>
>
>>> xrange=[-180,180], yrange=[-90,90], xstyle=1, ystyle=1, $
>
>>
>
>>>
>
>>
>
>>> yticks=6, ytickv=[-90,-60,-30,0,30,60,90], $
>
>>
>
>>>
>
>>
>
>>> xticks=6, xtickv=[-180,-120,-60,0,60,120,180], $
>
>>
>
>>>
>
>>
>
>>> xtitle='Longitude', ytitle='Latitude', charsize=1.5, $
>
>>
>
>>>
>
>>
>
>>> title=plotsym+' (all motions) / g m!u-1!n s!u-1!n'
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>>
>
>>
>
>>> If anyone can offer any suggestions then I'll be very grateful, as it's bugging me now!
>
>>
>
>>
>
>>
>
>> Just seeing "lon", "lat", and "contour" causes me to think that one of your problems is that you should be using the CELL_FILL keyword, rather than the FILL keyword.
>
>>
>
>>
>
>>
>
>> http://www.idlcoyote.com/color_tips/fill_colors.html
>
>>
>
>>
>
>>
>
>> If that doesn't work, I'd try cgCONTOUR. That routine will fill up the "normal" hole Contour creates.
>
>>
>
>>
>
>>
>
>> http://www.idlcoyote.com/tips/contour_hole.php
>
>>
>
>>
>
>>
>
>> Cheers,
>
>>
>
>>
>
>>
>
>> David
>
>
>
> Thanks David - I'll give both a try tomorrow and see what happens!
Hmm, well neither cell_fill nor cgcontour fix the problem. I'll have to have another fiddle and see what I can do, but it seems like it should work!
|
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| Re: Missing fill colours in contour plot [message #82817 is a reply to message #82812] |
Tue, 15 January 2013 16:11 |
tortoisesaregreat
Messages: 2
Registered: January 2013
|
Junior Member |
|
|
On Tuesday, 15 January 2013 22:14:04 UTC, Coyote wrote:
> On Tuesday, January 15, 2013 1:56:23 PM UTC-7, lj...@fsmail.net wrote:
>
>> I am trying to do a contour plot of a latitude-longitude array, but I keep getting gaps in my plot, as shown in the following image: http://www.physics.open.ac.uk/~lsteele/contour.png. I'm stumped as to the reason, as it's not as if it's missing contours at the very end ranges of the contour values - it's somewhere in between. Anyhow, I'm sure the knowledgable folks on here will know!
>
>>
>
>>
>
>>
>
>> I have defined a blue-white-red colour scheme and loaded it in with tvlct, but the problem occurs with other colour schemes too. I am calculating my contour levels and colours as follows (with ncont the number of contours I'm plotting):
>
>>
>
>>
>
>>
>
>> minv = floor(min(array))
>
>>
>
>> maxv = ceil(max(array))
>
>>
>
>> maxval = max([abs(array),abs(array)])
>
>>
>
>> clevels = -maxval + findgen(ncont)/(ncont-1)*2*maxval
>
>>
>
>> ccol = floor(findgen(ncont)/(ncont-1)*250)
>
>>
>
>>
>
>>
>
>> I am then plotting my contour plot as:
>
>>
>
>>
>
>>
>
>> device, decomposed=0
>
>>
>
>> bwr_colour, red_vec, grn_vec, blu_vec
>
>>
>
>> tvlct, red_vec, grn_vec, blu_vec
>
>>
>
>> contour, array, lon, lat, $
>
>>
>
>> levels=clevels, c_colors=ccol, /fill, $
>
>>
>
>> background=cgColor('white'), color=cgColor('black'), $
>
>>
>
>> xrange=[-180,180], yrange=[-90,90], xstyle=1, ystyle=1, $
>
>>
>
>> yticks=6, ytickv=[-90,-60,-30,0,30,60,90], $
>
>>
>
>> xticks=6, xtickv=[-180,-120,-60,0,60,120,180], $
>
>>
>
>> xtitle='Longitude', ytitle='Latitude', charsize=1.5, $
>
>>
>
>> title=plotsym+' (all motions) / g m!u-1!n s!u-1!n'
>
>>
>
>>
>
>>
>
>> If anyone can offer any suggestions then I'll be very grateful, as it's bugging me now!
>
>
>
> Just seeing "lon", "lat", and "contour" causes me to think that one of your problems is that you should be using the CELL_FILL keyword, rather than the FILL keyword.
>
>
>
> http://www.idlcoyote.com/color_tips/fill_colors.html
>
>
>
> If that doesn't work, I'd try cgCONTOUR. That routine will fill up the "normal" hole Contour creates.
>
>
>
> http://www.idlcoyote.com/tips/contour_hole.php
>
>
>
> Cheers,
>
>
>
> David
Thanks David - I'll give both a try tomorrow and see what happens!
|
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| Re: Missing fill colours in contour plot [message #82826 is a reply to message #82817] |
Tue, 15 January 2013 14:14 |
DavidF[1]
Messages: 94
Registered: April 2012
|
Member |
|
|
On Tuesday, January 15, 2013 1:56:23 PM UTC-7, lj...@fsmail.net wrote:
> I am trying to do a contour plot of a latitude-longitude array, but I keep getting gaps in my plot, as shown in the following image: http://www.physics.open.ac.uk/~lsteele/contour.png. I'm stumped as to the reason, as it's not as if it's missing contours at the very end ranges of the contour values - it's somewhere in between. Anyhow, I'm sure the knowledgable folks on here will know!
>
>
>
> I have defined a blue-white-red colour scheme and loaded it in with tvlct, but the problem occurs with other colour schemes too. I am calculating my contour levels and colours as follows (with ncont the number of contours I'm plotting):
>
>
>
> minv = floor(min(array))
>
> maxv = ceil(max(array))
>
> maxval = max([abs(array),abs(array)])
>
> clevels = -maxval + findgen(ncont)/(ncont-1)*2*maxval
>
> ccol = floor(findgen(ncont)/(ncont-1)*250)
>
>
>
> I am then plotting my contour plot as:
>
>
>
> device, decomposed=0
>
> bwr_colour, red_vec, grn_vec, blu_vec
>
> tvlct, red_vec, grn_vec, blu_vec
>
> contour, array, lon, lat, $
>
> levels=clevels, c_colors=ccol, /fill, $
>
> background=cgColor('white'), color=cgColor('black'), $
>
> xrange=[-180,180], yrange=[-90,90], xstyle=1, ystyle=1, $
>
> yticks=6, ytickv=[-90,-60,-30,0,30,60,90], $
>
> xticks=6, xtickv=[-180,-120,-60,0,60,120,180], $
>
> xtitle='Longitude', ytitle='Latitude', charsize=1.5, $
>
> title=plotsym+' (all motions) / g m!u-1!n s!u-1!n'
>
>
>
> If anyone can offer any suggestions then I'll be very grateful, as it's bugging me now!
Just seeing "lon", "lat", and "contour" causes me to think that one of your problems is that you should be using the CELL_FILL keyword, rather than the FILL keyword.
http://www.idlcoyote.com/color_tips/fill_colors.html
If that doesn't work, I'd try cgCONTOUR. That routine will fill up the "normal" hole Contour creates.
http://www.idlcoyote.com/tips/contour_hole.php
Cheers,
David
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| Re: Missing fill colours in contour plot [message #82827 is a reply to message #82826] |
Tue, 15 January 2013 14:07 |
tortoisesaregreat
Messages: 2
Registered: January 2013
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Junior Member |
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On Tuesday, 15 January 2013 20:56:23 UTC, lj...@fsmail.net wrote:
> I am trying to do a contour plot of a latitude-longitude array, but I keep getting gaps in my plot, as shown in the following image: http://www.physics.open.ac.uk/~lsteele/contour.png. I'm stumped as to the reason, as it's not as if it's missing contours at the very end ranges of the contour values - it's somewhere in between. Anyhow, I'm sure the knowledgable folks on here will know!
>
>
>
> I have defined a blue-white-red colour scheme and loaded it in with tvlct, but the problem occurs with other colour schemes too. I am calculating my contour levels and colours as follows (with ncont the number of contours I'm plotting):
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>
>
> minv = floor(min(array))
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> maxv = ceil(max(array))
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> maxval = max([abs(array),abs(array)])
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> clevels = -maxval + findgen(ncont)/(ncont-1)*2*maxval
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> ccol = floor(findgen(ncont)/(ncont-1)*250)
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>
>
> I am then plotting my contour plot as:
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>
>
> device, decomposed=0
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> bwr_colour, red_vec, grn_vec, blu_vec
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> tvlct, red_vec, grn_vec, blu_vec
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> contour, array, lon, lat, $
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> levels=clevels, c_colors=ccol, /fill, $
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> background=cgColor('white'), color=cgColor('black'), $
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> xrange=[-180,180], yrange=[-90,90], xstyle=1, ystyle=1, $
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> yticks=6, ytickv=[-90,-60,-30,0,30,60,90], $
>
> xticks=6, xtickv=[-180,-120,-60,0,60,120,180], $
>
> xtitle='Longitude', ytitle='Latitude', charsize=1.5, $
>
> title=plotsym+' (all motions) / g m!u-1!n s!u-1!n'
>
>
>
> If anyone can offer any suggestions then I'll be very grateful, as it's bugging me now!
>
>
>
> Cheers,
>
>
>
> Liam
Sorry - I made a mistake when typing the code to the newsgroup. The maxval statement actually reads:
maxval = max([abs(minv),abs(maxv)])
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