Physics Quıestion in Matlab

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Aykut Albayrak
Aykut Albayrak am 21 Jan. 2018
Kommentiert: Birdman am 21 Jan. 2018
As you can see question in below.I wrote this code but matlab gives some error.What can I do?
if true
function [outputArg1,outputArg2] = untitled2(inputArg1,inputArg2)
F=3;
x=1;
k=-F/x;
k
x(0)=1;
Dx(0)=-0.5;
x(t)=c1*sin(sqrt(k/m)*t)+c2*cos(sqrt(k/m));
end

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Birdman
Birdman am 21 Jan. 2018
Bearbeitet: Birdman am 21 Jan. 2018
Learn how to use Symbolic Toolbox first. Here is one approach:
F=3;m=4;x0=1;
%%1st
k=F/x0;
%%2nd-3rd
syms x(t)
eq=m*diff(x,t,2)==-k*x;
Dx=diff(x,t);
x=dsolve(eq,[x(0)==1 Dx(0)==0.5])
%4th
t=subs(t,0:0.01:2);
x=subs(x,t);
plot(t,x)
  2 Kommentare
Aykut Albayrak
Aykut Albayrak am 21 Jan. 2018
Thank you so much.You are the best matlab coder!
Birdman
Birdman am 21 Jan. 2018
Ah, no. Just someone with little experience about this stuff. You are welcome :)

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Roger Stafford
Roger Stafford am 21 Jan. 2018
Bearbeitet: Roger Stafford am 21 Jan. 2018
Matlab does not accept indices equal to zero. These can only be positive integers greater than zero. Therefore "x(0)=1;" and "Dx(0)=-0.5;" are not permitted. The same would apply to "x(t)" if 't' were of improper size.

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