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Working under Raspian, i have 2 Setups where i am generating 6 gnuplots in a C-program (with pipes). I have gnuplot 4.6, patchlevel 0 installed on both. Setup A: Everything works as expected. Setup B: The plots are not generated. I started to investigate some time, downloaded the examples for the C-Interface. It compiled and executed the examples without error, but no images showed up. when i entered the commands via shell manually (for example sine.png)

gnuplot
gnuplot> set terminal png
gnuplot> set output sine.png
gnuplot> plot sin(x)

the output is generated as expected.

Conclusion: I suppose I am missing some librarys on system B. but since nothing is actively complaining, I don't know where to start searching?

schiggn
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    What are the difference between "setup A" and "setup B"? When you can answer that you probably have your answer to this question. – Some programmer dude Sep 26 '14 at 13:19
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    you can print all of the linked libraries with ldd : http://linux.about.com/library/cmd/blcmdl1_ldd.htm – specializt Sep 26 '14 at 13:19
  • @JoachimPileborg setup A is my "prototyping system" based on Model B. I worked on since January and installed a whole lot of different needed and unneeded software on. Now i have to switch to setup B because I need more USB-Ports (Model B+). – schiggn Sep 26 '14 at 13:27
  • If you have any redirection to `/dev/null` going on in your shell scripts (a common practice with std-err is `cmd > outFile 2>/dev/null` (there are several other variants, just search for `/dev/null`)), remove the redirection. You may find some error messages there. Good luck. – shellter Sep 26 '14 at 13:29
  • @specializt I just ldd'ed my gnuplots - all the librarys present on system A are also present on system B. But thanks for the hint. – schiggn Sep 26 '14 at 13:54

1 Answers1

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By hazard I figured out what the problem was - speed. I found out that placing a 

sleep(x.y);

in between my code is solving the problem. Since I'm not working on a time critical application and the code doesn't have to be optimized, the problem for me is solved. Apparently on windows this issue is well known, see here.
Still unclear to me why this would happen on the newer hardware only.

Community
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schiggn
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