MATLAB: When I run script it doesn’t read the “R” or “V” variables it reads as is

solvesyms

R1=5;
R2=100;
R3=200;
R4=150;
R5=250;
v1=100;
v2=50;
v3=0;
eq1='(R1+R4)*i1-R4*i2=v1';
eq2='-(R4)*i1+(R2+R4+R5)*i2-(R5*i3)=v3';
eq3='R5*i2-(R3+R5)*i3=v2';
[i1,i2,i3]=solve(eq1,eq2,eq3)

Best Answer

Invoking the Symbolic Math Toolbox first, with the syms call, helps significantluy:

syms i1 i2 i3 v1 v2 v3 
R1=5;
R2=100;
R3=200;
R4=150;
R5=250;
v1=100;
v2=50;
v3=0;

eq1=(R1+R4)*i1-R4*i2==v1;
eq2=-(R4)*i1+(R2+R4+R5)*i2-(R5*i3)==v3;
eq3=R5*i2-(R3+R5)*i3==v2';
[i1,i2,i3]=solve(eq1,eq2,eq3)

i1 =
230/241

i2 =
77/241

i3 =
16/241
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