Hi Paul,
Please try the solution below using fsolve.
Could you let us know why do you want to solve that equation? Is it just for
fun or is there an underlying physical problem?
PS:
I was looking for a new version of Scilab and found a donate button, Scilab
needs our help.
Regards
Rafael Guerra
// Solution using fsolve (RG, 30-Mar-2014)
function y=fsol1(x)
y=cos(x).*cosh(x)+1;
endfunction
// plot problem to find where to define initial value guesses:
x=-20:0.1:20;
y1=cos(x);
y2=-sech(x);
clf;
plot(x,y1,'b',x,y2,'r');
// solve for first 10 solutions:
N=10;
x0= linspace(%pi/2,%pi/2+(N-1)*%pi,N);
[Xsol]=fsolve(x0,fsol1);
for i=1:N
printf("X(%2i)= +/- %8.6f\n",i,Xsol(i));
end
-----Original Message-----
From: users [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Sunday, March 30, 2014 10:48 AM
To: International users mailing list for Scilab.
Subject: [Scilab-users] Re : finding roots
Hooops I make a mistake :
cos(x)*cosh(x)+1=0
Paul
----- Mail d'origine -----
De: paul carrico <[email protected]>
À: International users mailing list for Scilab. <[email protected]>
Envoyé: Sun, 30 Mar 2014 11:30:23 +0200 (CEST)
Objet: [Scilab-users] finding roots
Dear All
I would like to find the first 10 roots of the following equation :
cos(x)*cosh(x)-1=0
I think the solution is not trivial and need a specific development, isn't it ?
Cheers
Paul
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