ERROR: FSOLVE requires all values returned by functions to be of data type double.

Question

Dhawal Beohar 2022-3-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1675174-error-fsolve-requires-all-values-returned-by-functions-to-be-of-data-type-double

评论： Dhawal Beohar 2022-3-19

I understand FSOLVE does not work with sym variables but it is not working using fzero as well. OR is there any alternative?

function fval = fun(u)
d1=20;
n=10^-11.4;
m=2.7;
a=0.5;
T=1;
PsByN_0dB=25;                                                     
PsByN_0=10.^(PsByN_0dB/10);
fun2 = @(u) ((1./u).*log(expint(2,sym(-PsByN_0.*u))).*exp(-PsByN_0*u));
u0 = -0.0031622776;
U = fsolve(fun2,u0)

I have also tried using fzero:

function fval = fun(u)
d1=20;
n=10^-11.4;
m=2.7;
a=0.5;
T=1;
PsByN_0dB=25;                                                     
PsByN_0=10.^(PsByN_0dB/10);
fun2 = @(u) ((1./u).*log(expint(2,sym(-PsByN_0.*u))).*exp(-PsByN_0*u));
u0 = -0.0031622776;
fzero (fun2, u0)