Error in Matlab command line

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evoplus

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Matlab Question

Hi everyone,

I'm currently writing a matlab problem that has one of this command line x^4+c3*x^3+c2*x^2+c1*x+c0=0. My aim is to come up with the values of x. All the c3,c2,c1,c0 parameters have been properly defined. However it keeps showing the Error File that the assignment statements cannot produce a result. Could I ask why is this so?

Thanks
 

Re: Matlab Question

hi evoplus,
if you want solve this equation , you should enter >>roots([1 c3 c2 c1 c0])
in MATLAB command window till MATLAB find roots of your equation.
good luck.
 

Re: Matlab Question

m_mir said:
hi evoplus,
if you want solve this equation , you should enter >>roots([1 c3 c2 c1 c0])
in MATLAB command window till MATLAB find roots of your equation.
good luck.
Click to expand...

Hi m_mir,

I tried ur suggestion inputing the roots ([1 c3 c2 c0]) after the x^4+c3*x^3+c2*x^2+c1*x+c0=0 but it still says that the assignment statement ( which is the x^4+c3*x^3+c2*x^2+c1*x+c0=0 ) cannot produce the result. All my c value can generate result. So have I missed out something?

Thanks
 

Matlab Question

Try this:
Code: 
% Matlab code
c0=1;
c1=1;
c2=1;
c3=1;

equation=strcat('x^4+',num2str(c3),'*x^3+',num2str(c2),'*x^2+',num2str(c1),'*x+',num2str(c0),'=0')

solve(equation)
Code: 
% Output
equation =

x^4+1*x^3+1*x^2+1*x+1=0


ans =
 
[  1/4*5^(1/2)-1/4+1/4*i*2^(1/2)*(5+5^(1/2))^(1/2)]
[ -1/4*5^(1/2)-1/4+1/4*i*2^(1/2)*(5-5^(1/2))^(1/2)]
[ -1/4*5^(1/2)-1/4-1/4*i*2^(1/2)*(5-5^(1/2))^(1/2)]
[  1/4*5^(1/2)-1/4-1/4*i*2^(1/2)*(5+5^(1/2))^(1/2)]
 

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