| make_array function bug [message #88815] |
Mon, 23 June 2014 16:10  |
Ken G
Messages: 14
Registered: September 2006
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Junior Member |
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I discovered an odd bug in make_array()
Try this
plot, make_array(99999L, start=10d, /index, increment=2d, /double)
Then this
plot, make_array(99999L+1L, start=10d, /index, increment=2d, /double)
It looks to me like there's a typecasting problem going on inside the routine, causing problems! I see that the increment keyword was added in 8.3, so there could be a newish bug there.
In this example, once the number of elements grows to 100k, the output is a sawtooth, no longer smooth.
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| Re: make_array function bug [message #88838 is a reply to message #88815] |
Wed, 25 June 2014 01:41  |
Lajos Foldy
Messages: 176
Registered: December 2011
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Senior Member |
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On Tuesday, June 24, 2014 1:10:18 AM UTC+2, Ken G wrote:
> I discovered an odd bug in make_array()
>
> Try this
>
> plot, make_array(99999L, start=10d, /index, increment=2d, /double)
>
> Then this
>
> plot, make_array(99999L+1L, start=10d, /index, increment=2d, /double)
>
> It looks to me like there's a typecasting problem going on inside the routine, causing problems! I see that the increment keyword was added in 8.3, so there could be a newish bug there.
Seems to be a bug in multithreading, the start values for the threads are set incorrectly. It works as expected with 'cpu, tpool_nthreads=1'.
regards,
Lajos
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| Re: make_array function bug [message #88912 is a reply to message #88839] |
Thu, 03 July 2014 02:30 |
chris_torrence@NOSPAM
Messages: 528
Registered: March 2007
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Senior Member |
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On Wednesday, June 25, 2014 6:05:16 PM UTC+9, Fabien wrote:
> Good catch!
>
>
>
> You should definitely open a bug report for this one...
Ack. That's too funny. I just discovered this bug at around the same time. It also affects the [0:n:inc] method of creating arrays.
I'll fix it for the next release of IDL.
Cheers,
Chris
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