error in solving system of nonlinear equations

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Muhammad Ali
Muhammad Ali 2020-6-4
评论： Rik 2020-6-4
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 个评论
Rik
Rik 2020-6-4
What release are you using? When I run this code I don't get this error.
Did you notice the warning above the error? There is no explicit solution, so when you try to extract it that doesn't really make sense.
Muhammad Ali
Muhammad Ali 2020-6-4
I am using R2014a release.
Kindly guide what should I do

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回答（1 个）

madhan ravi
madhan ravi 2020-6-4
编辑：madhan ravi 2020-6-4
sol = solve([eq1, eq2, eq3, eq4],[x,y,z,T]); %proper way to use solve
  3 个评论
显示 1更早的评论
Muhammad Ali
Muhammad Ali 2020-6-4
getting the same error using the command you gave for solve function.
Kinldy guide how can I use fsolve in this code
Rik
Rik 2020-6-4
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?

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