Syms equation in GUI to @ equation solver

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Martin Maurel
Martin Maurel 2021-3-12
评论： Martin Maurel 2021-4-14
Hello, I write a GUI on Matlab 2020 with all the Toolbox, but need to work also on a Matlab 2007 without all the Toolbox.
Currently I use :
function [dt] = DeltaT(lambda0,c,deltaLambdaSPM,tfwhm)
dtlim=lambda0/2/c %% lower limit
syms x
A=c*lambda0*2*x/(2*c*x-lambda0);
B=c*lambda0*2*x/(2*c*x+lambda0);
C=A-B;
eqn=C==7*deltaLambdaSPM;
varLimits(1,1) = dtlim;
varLimits(2,1)=tfwhm/5 ;
S = vpasolve([eqn],x,varLimits);
dt=double(S);
end
With Matlab 2020 + Toolbox it's working, not with the other.
So I try to modify it
lambda0=1030e-9;
c=3e8;
tfwhm=500e-15;
deltaLambdaSPM=1.35e-06;
dtlim=lambda0/2/c;
fun = @(x) c*lambda0*2*x./(2*c*x-lambda0)- c*lambda0*2*x./(2*c*x+lambda0) - 7*deltaLambdaSPM
x0 = [dtlim tfwhm/5];
z = fzero(fun,x0)
%%
Error using fzero (line 229)
Function values at interval
endpoints must be finite and
real.
Error in testesuationsolver
(line 17)
z = fzero(fun,x0)
I try also fsolve...
solution should be : 1.9e-15
If someone have an idea?
Regards

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