More precision in functions for gnuplot

Question

I'm trying to plot this function with gnuplot

but when I try to do it a find this Warning: empty y range [1:1], adjusting to [0.99:1.01]. I think that it should be a precision problem. I can plot it perfectly in another programs, but I would like to know why I can not plot it with gnuplot and how to fix it

Edit:

The command that I'm using is

f(x)=(1-(sinh(1/x))**(-4))**(1/8)

plot [0.01:1.131] f(x)

Please show the command you used in gnuplot. Also show what x range you tried to plot - note that sinh(1/x) blows up for x near zero. — Ethan
– Ethan, Commented May 20, 2021 at 22:33

Ethan · Accepted Answer · 2021-05-20 22:51:17Z

2

Two things:

That equation as written does not match the one you showed. Is the exponent supposed to be 4 or -4?
Gnuplot uses integer arithmetic, so (1/8) evaluates to 0. Use either (1./8.) or (.125)

Possible correction (depending on what is the correct exponent):

f(x) = (1. - (sinh(1/x)**(-4)))**(1./8.)
set xrange [0.01 : 1.131]
plot f(x)

answered May 20, 2021 at 22:51

Ethan

15.4k2 gold badges15 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user239504 Over a year ago

You are right, I put -4 in the exponent. I already change it. The answer to my problem is that gnuplot use integer arithmetic, like you said. Thank you

Collectives™ on Stack Overflow

More precision in functions for gnuplot

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related