# error in solving system of nonlinear equations

1 view (last 30 days)
Muhammad Ali on 4 Jun 2020
Commented: Rik on 4 Jun 2020
I am trying to solve four nonlinear equation simultaneously on matlab. But I am getitng the "Comma separated list expansion has cell syntax for an array that is not a cell".
The screenshot of error is attached.
My code is given below.
syms x y z T
x1=1;
x2=1;
x3=1;
x4=1;
y1=1;
y2=1;
y3=1;
y4=1;
z1=1;
z2=1;
z3=1;
z4=1;
c=1;
t1=1;
t21=1;
t31=1;
t41=1;
eq1 = ((x1 - x)^2 + (y1 - y)^2 + (z1 - z)^2 )^1/2 - (c * t1) + (c * T)==0;
eq2 = ((x2 - x)^2 + (y2 - y)^2 + (z2 - z)^2 )^1/2 - (c * t21) - (c*t1) + (c*T)==0;
eq3 = ((x3 - x)^2 + (y3 - y)^2 + (z3 - z)^2 )^1/2 - (c * t31) - (c*t1) + (c*T)==0;
eq4 = ((x4 - x)^2 + (y4 - y)^2 + (z4 - z)^2 )^1/2 - (c * t41) - (c*t1) + (c*T)==0;
sol = solve(eq1, eq2, eq3, eq4);
xSol = sol.x
ySol = sol.y
zSol = sol.z
TSol = sol.T ##### 2 CommentsShowHide 1 older comment
Muhammad Ali on 4 Jun 2020
I am using R2014a release.
Kindly guide what should I do

madhan ravi on 4 Jun 2020
Edited: madhan ravi on 4 Jun 2020
sol = solve([eq1, eq2, eq3, eq4],[x,y,z,T]); %proper way to use solve
Rik on 4 Jun 2020
Are you sure there should be an explicit solution? What would you expect your output to be if you wanted to solve sin(x)==2?