gnuplot-bugs Mailing List for gnuplot

Hello all, 

After setting the terminal to pngcairo, trying to plot a sin(x) or just type
"test" gave me a error message like this:

>gnuplot(20208) malloc: *** error for object 0x3: Non-aligned pointer being
freed
>*** set a breakpoint in malloc_error_break to debug
>Bus error

I am using gnuplot 4.5, under mac os 10.5.8. 
It seems to be a problem from cairo. Since I also tried the terminal
pdfcairo, after typing "test" , it shows:

>Floating point exception

Does anyone has an idea ?

Thanks a lot, 

Zong
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the endless loop may be caused by the "tics generation mechanism"
which loops endlessly when the step size is too small for the machine
precision - but this has been repaired one year ago...

i'm not able to reproduce this behaviour, instead i get the message
         warning: tick interval too small for machine precision
         warning: tick interval too small for machine precision
but i'm running an older kernel
        System: Linux 2.4.21-303-athlon


lq-3 wrote:
> 
> gnuplot version and system environment:
>> G N U P L O T
>> Version 4.2 patchlevel 6
>> last modified Sep 2009
>> System: Linux 2.6.30-ARCH
>> lq ~ $ uname -a
>> Linux lq-laptop 2.6.30-ARCH #1 SMP PREEMPT Wed Sep 9 12:37:32 UTC 2009
>> i686 Genuine Intel(R) CPU T2060 @ 1.60GHz GenuineIntel GNU/Linux
> 
> terminal:wxt or x11
> command:plot 'dat'
> 
> result: a lot of cpu used and no image ploted
> 
> 
> 1.     0.7000000000000001     
> 2.     0.7     
> 3.     0.7000000000000001     
> 4.     0.7     
> 5.     0.7000000000000001     
> 6.     0.7     
> 7.     0.7000000000000001     
> 8.     0.7     
> 9.     0.7000000000000001     
> 10.     0.7     
> 11.     0.7000000000000001     
> 12.     0.7     
> 13.     0.7000000000000001     
> 14.     0.7     
> 15.     0.7000000000000001     
> 16.     0.7     
> 17.     0.7000000000000001     
> 18.     0.7     
> 19.     0.7000000000000001     
> 20.     0.7     
> 21.     0.7000000000000001     
> 22.     0.7     
> 23.     0.7000000000000001     
> 24.     0.7     
> 25.     0.7000000000000001     
> 26.     0.7     
> 27.     0.7000000000000001     
> 28.     0.7     
> 29.     0.7000000000000001     
> 30.     0.7     
> 31.     0.7000000000000001     
> 32.     0.7     
> 33.     0.7000000000000001     
> 34.     0.7     
> 35.     0.7000000000000001     
> 36.     0.7     
> 37.     0.7000000000000001     
> 38.     0.7     
> 39.     0.7000000000000001     
> 40.     0.7     
> 41.     0.7000000000000001     
> 42.     0.7     
> 43.     0.7000000000000001     
> 44.     0.7     
> 45.     0.7000000000000001     
> 46.     0.7     
> 47.     0.7000000000000001     
> 48.     0.7     
> 49.     0.7000000000000001     
> 50.     0.7     
> 51.     0.7000000000000001     
> 52.     0.7     
> 53.     0.7000000000000001     
> 54.     0.7     
> 55.     0.7000000000000001     
> 56.     0.7     
> 57.     0.7000000000000001     
> 58.     0.7     
> 59.     0.7000000000000001     
> 60.     0.7     
> 61.     0.7000000000000001     
> 62.     0.7     
> 63.     0.7000000000000001     
> 64.     0.7     
> 65.     0.7000000000000001     
> 66.     0.7     
> 67.     0.7000000000000001     
> 68.     0.7     
> 69.     0.7000000000000001     
> 70.     0.7     
> 71.     0.7000000000000001     
> 72.     0.7     
> 73.     0.7000000000000001     
> 74.     0.7     
> 75.     0.7000000000000001     
> 76.     0.7     
> 77.     0.7000000000000001     
> 78.     0.7     
> 79.     0.7000000000000001     
> 80.     0.7     
> 81.     0.7000000000000001     
> 82.     0.7     
> 83.     0.7000000000000001     
> 84.     0.7     
> 85.     0.7000000000000001     
> 86.     0.7     
> 87.     0.7000000000000001     
> 88.     0.7     
> 89.     0.7000000000000001     
> 90.     0.7     
> 91.     0.7000000000000001     
> 92.     0.7     
> 93.     0.7000000000000001     
> 94.     0.7     
> 95.     0.7000000000000001     
> 96.     0.7     
> 97.     0.7000000000000001     
> 98.     0.7     
> 99.     0.7000000000000001     
> 100.     0.7     
> 
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gnuplot version and system environment:
> G N U P L O T
> Version 4.2 patchlevel 6
> last modified Sep 2009
> System: Linux 2.6.30-ARCH
> lq ~ $ uname -a
> Linux lq-laptop 2.6.30-ARCH #1 SMP PREEMPT Wed Sep 9 12:37:32 UTC 2009
> i686 Genuine Intel(R) CPU T2060 @ 1.60GHz GenuineIntel GNU/Linux

terminal:wxt or x11
command:plot 'dat'

result: a lot of cpu used and no image ploted

In plotting some data I notice that this works as expected

gnuplot> set pm3d at b interpolate 1,1
gnuplot> splot sqrt(x**2+y**2)

but this does not

gnuplot> set pm3d at b interpolate 2,2
gnuplot> splot sqrt(x**2+y**2)

The problem seems to be interpolate having an argument greater than 1.  In this case, the color map appears only at the surface, regardless of whether "at s" is specified.  The color map does not appear at the bottom (or at the top, if t is specified).  Also, using "splot xxxx with pm3d at bs" gives the same result, with the plot at the bottom missing.  Using 'set pm3d map' works as expected.

Of course, I realize one shouldn't use interpolate with a function, I am just providing this as an example.  I'd like to be able to plot both the colormap on the bottom, and the colorized surface with interpolated colors working off numerical data from a file.  The same exact behavior occurs with numerical data rather than a function.  I have tested this on Ubuntu 9.04 with gnuplot 4.2 patchlevel 4 and Windows with gnuplot 4.2 patchlevel 6.

Thanks for reading.

~Erik Ylvisaker
 		 	   		  
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