MATLAB: Matlab Outputting answers as fractions

equationMATLABoutput

Hi so i'm trying to find 4 variables from 4 linear equations which it does however the answers output are all huge fractions for some reason anyone know how to change this? Code attached for context.

clear; clc;
format shortG
syms C1 C2 C3 C4
eqn1= 0.3598*C1 - 0.6445*C2 - 0.6388*C3 + 0.2170*C4 == 0;
eqn2= -0.6155*C1 + 0.3427*C2 - 0.5333*C3 + 0.4683*C4 == 40;
eqn3= 0.5942*C1 + 0.3962*C2 + 0.1659*C3 + 0.6800*C4 == 0;
eqn4= -0.3724*C1 - 0.5570*C2 + 0.5291*C3 +0.5208*C4 == 0;
[A,B] = equationsToMatrix([eqn1, eqn2, eqn3, eqn4], [C1, C2, C3, C4]);
X=linsolve(A,B)
X =
 
 -123100469289600000/5000172844664399
   68542380776800000/5000172844664399
 -106674157217600000/5000172844664399
   93657426868400000/5000172844664399

Best Answer

You are still in the Symbolic Math Toolbox environment.

Try one of these (depending on the rresult you want):

X = vpa(linsolve(A,B))
X = double(linsolve(A,B))

The vpa call keeps the results symbolic, the double call makes the results numeric.

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MATLAB: Solve symbol four equations for c1 c2 c3 c4

Thanks, I solve it,

clc
clear
syms a b x y c1 c2 c3 c4 T1 T2 T3 T4  
T=c1+c2*x+c3*y+c4*x*y;
%%
r1=c1+c2*a+c3*b+c4*a*b-T1;
r2=c1-c2*a+c3*b-c4*a*b-T2;
r3=c1-c2*a-c3*b+c4*a*b-T3;
r4=c1+c2*a-c3*b-c4*a*b-T4;
%%Find C1 and C4
p13=r1+r3;
p24=r2+r4;
n1=solve(p13==0,c1);
n2=solve(p24==0,c1);
C4=solve(n1==n2,c4)
w1=solve(p13==0,c4);
w2=solve(p24==0,c4);
C1=solve(w1==w2,c1)
r1=subs(r1,c1,C1);
r1=subs(r1,c4,C4);
r2=subs(r2,c1,C1);
r2=subs(r2,c4,C4);
r3=subs(r3,c1,C1);
r3=subs(r3,c4,C4);
r4=subs(r4,c1,C1);
r4=subs(r4,c4,C4);
%%Find C3
q12=r1+r2;
q34=r3+r4;
C3=solve(q12==0,c3)
r1=subs(r1,c3,C3);
r2=subs(r2,c3,C3);
r3=subs(r3,c3,C3);
r4=subs(r4,c3,C3);
%% find C2
C2=solve(r1==0,c2)
r1=subs(r1,c2,C2);
r2=subs(r2,c2,C2);
r3=subs(r3,c2,C2);
r4=subs(r4,c2,C2);
C1
C2
C3
C4

Best Answer

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