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line thickness issue, LineWidth acts as an integer

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Mohsen
Mohsen on 20 Jul 2016
Answered: dpb on 20 Jul 2016
when I use
plot(x,y,'LineWidth',lw)
and lw is less than 1.49 I get a thin line and when it is 1.50 or higher I get a thick line (thicker than I want). My understanding is that lw is a scalar, but here it is as if it is getting rounded to the nearest integer. Somehow I am not able to fine tune thickness this way. Any suggestions? I am using Matlab 2008a.

Accepted Answer

dpb
dpb on 20 Jul 2016
There's inevitable granularity owing to the screen being finite number of pixels. For a default figure here, the resolution works out for the display area that height is 342 pixels or 3.56 inches or roughly 95 pixels/inch. A point (linewidth units) is 1/72" so there's roughly 72/95 --> 0.758 pixels/point so rounding will cause the finite jumps in renderable line widths. That's just limitation of hardware; higher resolution the monitor, the better, of course, but it's not continuously variable in representation even though the math computation is much more precise.

More Answers (1)

J. Webster
J. Webster on 20 Jul 2016
as far as I know the only available line widths are 0.5, 1.0, 2.0, 3.0, 4.0 etc...I suspect it's a floating point to accommodate the 0.5 width. In my experience though, there usually isn't a difference between 0.5 and 1.0.

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