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Kenneth_Smith
Joined: 18 May 2012 Posts: 697 Location: Hamilton, Lanarkshire, Scotland.
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Posted: Mon Oct 16, 2023 5:47 pm Post subject: %pl[native,n_graphs=1] |
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In the following code y = x**2 is plotted using 6 different sets of %pl options (using 64 bit compiler with checkmate - so by default we are using the native %pl).
In the second case, a blank graphics region is produced, which can be corrected by adding the n_graphs=1 option. The default value for n_graphs is 1, and this declaration is not required in the other cases.
It's not clear to me why n_graphs=1 is required in one particular case, but not in any of the others? Is this a bug or am I missing something here?
Code: | program p1
use clrwin
implicit none
real*8 :: y1(1:10), x1(1:10), xstart=1.d0, dx=1.d0
integer :: i
x1 = [(i, i=1,10)]
y1 = [(i**2, i=1,10)]
! Without x_array option
i = winio@('%pl[native]', 500,500,10,xstart,dx,y1) ! This produces the expected plot.
! The [native] option is the default for the 64 bit compiler
! so this declaration is redundant. Yet removing it changes
! the outcome.
i = winio@('%pl', 500,500,10,xstart,dx,y1) ! This produces a blank plot. #####
! To get back to the expected plot add [n_graphs = 1]
i = winio@('%pl[n_graphs=1]', 500,500,10,xstart,dx,y1) ! This produces the expected plot. But n_graphs = 1 is the
! default (as in the first example) so why is this necessary?
! Shouldn't the first two winio calls produce identical plots?
! With x_array option
i = winio@('%pl[native,x_array]', 500,500,10,x1,y1) ! This produces the expected plot.
i = winio@('%pl[x_array]', 500,500,10,x1,y1) ! This produces the expected plot. n_graphs=1 is not required.
i = winio@('%pl[x_array,n_graphs=1]',500,500,10,x1,y1) ! This produces the expected plot.
end program p1 |
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PaulLaidler Site Admin
Joined: 21 Feb 2005 Posts: 7933 Location: Salford, UK
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Posted: Tue Oct 17, 2023 6:52 am Post subject: |
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Ken
There is something that needs fixing here and, unless I report back, you can assume that it will be fixed.
The original %pl design for SimplePlot allowed for a maximum of 10 graphs and this effectively becomes the default value of n_graphs though fewer that 10 naturally works correctly.
The rule for the native %pl is that, if you want more than 10 graphs then n_graphs must be the first option. Even so, your code does reveal a bug in ClearWin+. |
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Kenneth_Smith
Joined: 18 May 2012 Posts: 697 Location: Hamilton, Lanarkshire, Scotland.
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Posted: Tue Oct 17, 2023 11:05 am Post subject: |
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No problem Paul, I will leave this one with you.
If the user always specifies a value for n_graphs the issue does not arise, which is probably the reason I did not find this earlier as that is generally something I habitually do. |
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