How to use log scale with fimplicit

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lorenzosilvestri1998
评论： lorenzosilvestri1998 2022-8-18
Ran in:
Hi everyone, I have to plot an implicit equation and I'm using fimplicit:
fimplicit(@(x,y) cosh((log(2)*(x-1))./((x+1).*y)) - (1/2)*exp(log(2)./y), [1 1000 0 1])
that's ok but I need it on log scale on the x-axis. Is it possibile to use semilogx in this case or something similar?
Thx :)
lorenzo

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采纳的回答

Torsten
Torsten 2022-8-18
编辑：Torsten 2022-8-18
Ran in:
x = 0:0.1:1000;
fun = @(x,y) cosh((log(2)*(x-1))./((x+1).*y)) - (1/2)*exp(log(2)./y);
options = optimset('Display','none');
tic
y = fsolve(@(y)fun(x,y),0.5*ones(size(x)),options);
toc
Elapsed time is 21.418050 seconds.
tic
y = arrayfun(@(x)fsolve(@(y)fun(x,y),0.5,options),x);
toc
Elapsed time is 4.687107 seconds.
semilogx(x,y)

更多回答（1 个）

Walter Roberson
Walter Roberson 2022-8-18
Ran in:
fimplicit(@(x,y) cosh((log(2)*(x-1))./((x+1).*y)) - (1/2)*exp(log(2)./y), [1 1000 0 1])
set(gca, 'XScale', 'log')

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