0 个投票

Dear MathWorks Community,
I am trying to use bvp4c/bvp5c and I always get the error:
"Error using char/eps
Too many input arguments.
Error in decomposition/isIllConditioned (line 600)
isIllCond = rc < eps('like',rc) || isnan(rc);
Error in bvp4c (line 196)
if isIllConditioned(dPHIdy)
Error in bratubvp (line 10)
sol1 = bvp4c(@bratuode,@bratubc,solinit,options);"
The code that I am trying to run is the bratubvp.m that is taken from:
https://www.mathworks.com/matlabcentral/fileexchange/3819-tutorial-on-solving-bvps-with-bvp4c
Any example that I am trying to run I always get the same error above. I am wondering whether someone else has run into a same issue and whether this can be resolved or not.
Thank you in advance for your help!

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Torsten
Torsten 2022-11-29

0 个投票

Did you create a function with name "eps" ? Then you should rename it because "eps" is an internal MATLAB function.

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Dear Torsten,
Thank you for your reply and help.
Looking at this function, it appears that I have not created any function with name "eps". A quick look in MATLAB shows that:
>> which eps
built-in (/home/stathis/Documents/MATLAB/R2022b/toolbox/matlab/elmat/eps)
Do you have any other suggestions?
Many thanks in advance for your help.
All the best,
Stathis.
Torsten
Torsten 2022-11-30
Ran in:
Ran in:
Do you have the same problems with this test code ?
If yes: what is the exact error message ?
xmesh = linspace(0,pi/2,5);
solinit = bvpinit(xmesh, @guess);
sol = bvp4c(@bvpfcn, @bcfcn, solinit);
plot(sol.x, sol.y, '-o')
function dydx = bvpfcn(x,y)
dydx = [y(2);-y(1)];
end
function res = bcfcn(ya,yb)
res = [ya(1);yb(1)-2];
end
function g = guess(x)
g = [sin(x);cos(x)];
end
Dear Torsten,
The error is the same as before:
Error using char/eps
Too many input arguments.
Error in decomposition/isIllConditioned (line 600)
isIllCond = rc < eps('like',rc) ||
isnan(rc);
Error in bvp4c (line 196)
if isIllConditioned(dPHIdy)
Error in untitled (line 3)
sol = bvp4c(@bvpfcn, @bcfcn, solinit);
Torsten
Torsten 2022-11-30
What is the output of
which -all eps
?
What is
char/eps
?
Dear Torsten,
I was able to locate the error. I have installed the advanpix package (for multi-precision computing), and the flag "-all" gave me a hint about it. Thanks a lot!

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