Even such simple function as abs(x) look really ugly with default settings, hardware probably significantly improved since last update of this default.
"looks really ugly" is not a very useful bug or problem report. Which terminal type? Which gnuplot version? For straight line plots, including the function abs(x), the sampling rate should not make any difference at all to the output quality. Sampling effects should only show up for rapidly varying functions.
Anyhow if you like higher sampling then you can put "set sample 1000" in ~/.gnuplot and it will become your personal default.
But note that increasing the sampling rate makes the interactive response time worse then mousing 3D plots.
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"looks really ugly" is not a very useful bug or problem report. Which terminal type? Which gnuplot version? For straight line plots, including the function abs(x), the sampling rate should not make any difference at all to the output quality. Sampling effects should only show up for rapidly varying functions.
Anyhow if you like higher sampling then you can put "set sample 1000" in ~/.gnuplot and it will become your personal default.
But note that increasing the sampling rate makes the interactive response time worse then mousing 3D plots.